I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim

--
Please don't feed the trolls

On 25/02/2021 18:28, Tim+ wrote:


I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


A layer of rust making a 9mm bolt oversize

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

My 3/8" socket would be at least 9.525mm, likely larger for a little
clearance. If this was a 3/8" bolt I would be surprised you squeezed a
9mm socket onto it, unless it was a 12 sided socket?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Briggs and Stratton has a US heritage so could well be imperial sizes.

On 25/02/2021 18:51, alan_m wrote:
On 25/02/2021 18:28, Tim+ wrote:
I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

A layer of rust making a 9mm bolt oversize


The standard dodge is to use the larger spanner and then to fill the
gap with the tapered end od a large flat screwdriver.

alan_m wrote:
On 25/02/2021 18:28, Tim+ wrote:


I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


A layer of rust making a 9mm bolt oversize


Nope. Definitely 9.5mm.

Tim

--
Please don't feed the trolls

Tim+ wrote:
I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


Um, that is 3/8" ...

I keep both socket sets here.

Such an occurrence here, would not even result in an eye roll.
We just alternate between the two socket sets, "until something fits".

With a lawn mower, the engine is made by one shop, the deck
and handle by another shop, with thousands of miles between 'em.

You're lucky the engine block is not made of plastic.
They tried that. Imagine how carefully you'd have to
torque the bolts then. "Oopsy, crack, too much torque"

Paul

alan_m wrote
Tim+ wrote

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

A layer of rust making a 9mm bolt oversize

Can't see it growing that much that way.

On 25/02/2021 18:51, Fredxx wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth
salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too
big, 9mm
too small.

It did occur to me that they might not be the original bolts so I
tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm.Â* WTF is the point of that?? How
many
socket sets include a 9.5?

My 3/8" socket would be at least 9.525mm, likely larger for a little
clearance. If this was a 3/8" bolt I would be surprised you squeezed a
9mm socket onto it, unless it was a 12 sided socket?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Briggs and Stratton has a US heritage so could well be imperial sizes.

Is the right answer. Could even be BSF/BSW. Although Hayter is British
(I used to work with a member of the family).

On 25/02/2021 19:36, Paul wrote:


You're lucky the engine block is not made of plastic.
They tried that. Imagine how carefully you'd have to
torque the bolts then. "Oopsy, crack, too much torque"

I've just replaced the plastic carburettor on my Briggs and Straton
engined lawn mower. The third party compatible carb cost around £10
(inclusive of postage). The only metal on the carb is the butterfly
flap, the inlet needle to the float chamber, the pin that is the pivot
point for the float, and the two bolts that hold it together.

I will strip down the one I took off but a can of carb cleaner
recommended for refurbishment could almost be the same cost as the
replacement carb. Also, all gasket kits also seem to be the same price
as a the third party carb replacement - luckily the gaskets are robust
and a replacement is not required for the carb I removed.


--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


3/8" is 9.525mm
--
Cheers
Clive

On 25/02/2021 20:39, Clive Arthur wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth
salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too
big, 9mm
too small.

It did occur to me that they might not be the original bolts so I
tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm.Â* WTF is the point of that?? How
many
socket sets include a 9.5?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


3/8" is 9.525mm

Ignore me. Been said.
--
C

Paul wrote:
Tim+ wrote:
I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


Um, that is 3/8" ...

Found a 3/8€� inch ring spanner eventually. It fits rather loosely but
better than anything else so far.



I keep both socket sets here.

Such an occurrence here, would not even result in an eye roll.
We just alternate between the two socket sets, "until something fits".

With a lawn mower, the engine is made by one shop, the deck
and handle by another shop, with thousands of miles between 'em.

Yeah but, these are bolts into the engine block. Everything else bolted to
the engine is metric.

Tim

--
Please don't feed the trolls

Fredxx wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

My 3/8" socket would be at least 9.525mm, likely larger for a little
clearance. If this was a 3/8" bolt I would be surprised you squeezed a
9mm socket onto it, unless it was a 12 sided socket?

I didnt squeeze a 9mm socket onto it. Re-read my post. A 3/8€� spanner fits
rather loosely (but usably).


I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Briggs and Stratton has a US heritage so could well be imperial sizes.

But that wouldnt explain why all the other engine bolts are standard
metric sizes. Its just the engine cooling shroud retaining bolts that are
odd.

Tim

--
Please don't feed the trolls

Clive Arthur wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


3/8" is 9.525mm

Yeah but, my micrometer measured at 9.49-9.50.

Tim

--
Please don't feed the trolls

"Tim+" wrote in message
...
Fredxx wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower
chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth
salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big,
9mm
too small.

It did occur to me that they might not be the original bolts so I tried
all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced
on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and
my
micrometer measures them up at 9.5mm. WTF is the point of that?? How
many
socket sets include a 9.5?

My 3/8" socket would be at least 9.525mm, likely larger for a little
clearance. If this was a 3/8" bolt I would be surprised you squeezed a
9mm socket onto it, unless it was a 12 sided socket?

I didnt squeeze a 9mm socket onto it. Re-read my post. A 3/8€� spanner
fits
rather loosely (but usably).


I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Briggs and Stratton has a US heritage so could well be imperial sizes.

But that wouldnt explain why all the other engine bolts are standard
metric sizes. Its just the engine cooling shroud retaining bolts that are
odd.

What are the other engine bolts ? There are some that
work fine with both metric and non metric spanners.

On 25/02/2021 20:47, Tim+ wrote:
Paul wrote:
Tim+ wrote:
I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


Um, that is 3/8" ...

Found a 3/8€� inch ring spanner eventually. It fits rather loosely but
better than anything else so far.



I keep both socket sets here.

Such an occurrence here, would not even result in an eye roll.
We just alternate between the two socket sets, "until something fits".

With a lawn mower, the engine is made by one shop, the deck
and handle by another shop, with thousands of miles between 'em.

Yeah but, these are bolts into the engine block. Everything else bolted to
the engine is metric.

Tim


What diameter and threads per inch are the bolts themselves?

--
Cheers,
Roger

On 25/02/2021 20:47, Tim+ wrote:
Fredxx wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

My 3/8" socket would be at least 9.525mm, likely larger for a little
clearance. If this was a 3/8" bolt I would be surprised you squeezed a
9mm socket onto it, unless it was a 12 sided socket?

I didnt squeeze a 9mm socket onto it. Re-read my post. A 3/8€� spanner fits
rather loosely (but usably).

Sorry! "9mm open ender spanner".

I have been known to hammer open spanners successfully too.

Sometimes it is useful to have a digital caliper. I fine 1/2" sockets
and 13mm are often interchangeable down to tolerances.

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Briggs and Stratton has a US heritage so could well be imperial sizes.

But that wouldnt explain why all the other engine bolts are standard
metric sizes. Its just the engine cooling shroud retaining bolts that are
odd.

You might get a clue from a thread gauge. The pitch on threads is more
accurately defined.

On 25/02/2021 20:59, Rod Speed wrote:


"Tim+" wrote in message
...
Fredxx wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower
chucked
into the long grass by a road whilst out for a jog the other day so
Ive
brought it home to see if its repairable or has any bits worth
salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too
big, 9mm
too small.

It did occur to me that they might not be the original bolts so I
tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be
forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match
and my
micrometer measures them up at 9.5mm.Â* WTF is the point of that??
How many
socket sets include a 9.5?

My 3/8" socket would be at least 9.525mm, likely larger for a little
clearance. If this was a 3/8" bolt I would be surprised you squeezed a
9mm socket onto it, unless it was a 12 sided socket?

I didnt squeeze a 9mm socket onto it. Re-read my post. A 3/8€� spanner
fits
rather loosely (but usably).


I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Briggs and Stratton has a US heritage so could well be imperial sizes.

But that wouldnt explain why all the other engine bolts are standard
metric sizes. Its just the engine cooling shroud retaining bolts that
are
odd.

What are the other engine bolts ?Â* There are some that
work fine with both metric and non metric spanners.

11mm and 7/8" are interchangeable, and as I've said 1/2" and 13mm can be
generally used interchangeably, so can 14mm and 9/16". It all depends on
the quality of spanners/sockets.

On 25/02/2021 20:49, Tim+ wrote:
Clive Arthur wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big, 9mm
too small.

It did occur to me that they might not be the original bolts so I tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


3/8" is 9.525mm

Yeah but, my micrometer measured at 9.49-9.50.

I think the 3/8" - 9.52mm is treated like an upper limit. So 9.49-9.50
is a quality bolt. Shame about the 3/8" spanner!

On 25 Feb 2021 at 19:21:56 GMT, "Tim+" wrote:

alan_m wrote:
On 25/02/2021 18:28, Tim+ wrote:


I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


A layer of rust making a 9mm bolt oversize


Nope. Definitely 9.5mm.

Tim

That's 3/8" AF with pretty high precision.

--
Roger Hayter

"Fredxx" wrote in message
...
On 25/02/2021 20:59, Rod Speed wrote:


"Tim+" wrote in message
...
Fredxx wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower
chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth
salvaging.

I started stripping it down and all the bolts were regular metric
sizes
until I came to remove the engine cooling cowling. 10mm socket too
big, 9mm
too small.

It did occur to me that they might not be the original bolts so I
tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced
on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match and
my
micrometer measures them up at 9.5mm. WTF is the point of that?? How
many
socket sets include a 9.5?

My 3/8" socket would be at least 9.525mm, likely larger for a little
clearance. If this was a 3/8" bolt I would be surprised you squeezed a
9mm socket onto it, unless it was a 12 sided socket?

I didnt squeeze a 9mm socket onto it. Re-read my post. A 3/8€� spanner
fits
rather loosely (but usably).


I cant believe that a designer decided that 9 mm would be too weak
and
that a 10mm would be too cramped for space.

Briggs and Stratton has a US heritage so could well be imperial sizes.

But that wouldnt explain why all the other engine bolts are standard
metric sizes. Its just the engine cooling shroud retaining bolts that
are
odd.

What are the other engine bolts ? There are some that
work fine with both metric and non metric spanners.

11mm and 7/8" are interchangeable, and as I've said 1/2" and 13mm can be
generally used interchangeably, so can 14mm and 9/16". It all depends on
the quality of spanners/sockets.

Yeah, thats what I meant. If they other engine bolts are all the
same size, and is one of the ones you listed, it wouldnt be at
all surprising that they are all non metric given that its B&S.

On Thu, 25 Feb 2021 22:18:46 +0000, Fredxx, the notorious, troll-feeding,
senile smartass, blathered again:

FLUSH

About time you two endlessly babbling senile twits got a hotel room! Eh,
smartass Freddie? BG

Its obviously an alien from the planet zob who dumped it there, and their
socket sets do have that size?


Brian

--

This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Tim+" wrote in message
...

I happened to stumble upon an old Hayter electric start lawnmower chucked
into the long grass by a road whilst out for a jog the other day so I've
brought it home to see if it's repairable or has any bits worth salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too big,
9mm
too small.

It did occur to me that they might not be the original bolts so I tried
all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be forced on
with a bit of percussive persuasion.

I'm now inclined to think that they are original as they all match and my
micrometer measures them up at 9.5mm. WTF is the point of that?? How many
socket sets include a 9.5?

I can't believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim

--
Please don't feed the trolls

American stuff often seems to have illogical sizes, what about the thread
itself?
Brian

--

This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Roger Hayter" wrote in message
...
On 25 Feb 2021 at 19:21:56 GMT, "Tim+" wrote:

alan_m wrote:
On 25/02/2021 18:28, Tim+ wrote:

I can't believe that a designer decided that 9 mm would be too weak
and
that a 10mm would be too cramped for space.
Tim

A layer of rust making a 9mm bolt oversize


Nope. Definitely 9.5mm.

Tim

That's 3/8" AF with pretty high precision.

--
Roger Hayter

On 25/02/2021 19:21, Tim+ wrote:
alan_m wrote:
On 25/02/2021 18:28, Tim+ wrote:


I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


A layer of rust making a 9mm bolt oversize


Nope. Definitely 9.5mm

Nope, definitely 3/8"

Briggs are Yankee - its all imperial


Tim



--
€œBut what a weak barrier is truth when it stands in the way of an
hypothesis!€�

Mary Wollstonecraft

On 25/02/2021 20:02, newshound wrote:
On 25/02/2021 18:51, Fredxx wrote:
On 25/02/2021 18:28, Tim+ wrote:

I happened to stumble upon an old Hayter electric start lawnmower
chucked
into the long grass by a road whilst out for a jog the other day so Ive
brought it home to see if its repairable or has any bits worth
salvaging.

I started stripping it down and all the bolts were regular metric sizes
until I came to remove the engine cooling cowling. 10mm socket too
big, 9mm
too small.

It did occur to me that they might not be the original bolts so I
tried all
the AF and Whitworth spanners that I have. No joy.

Eventually dug out a cheap 9mm open ender spanner that could be
forced on
with a bit of percussive persuasion.

Im now inclined to think that they are original as they all match
and my
micrometer measures them up at 9.5mm.Â* WTF is the point of that?? How
many
socket sets include a 9.5?

My 3/8" socket would be at least 9.525mm, likely larger for a little
clearance. If this was a 3/8" bolt I would be surprised you squeezed a
9mm socket onto it, unless it was a 12 sided socket?

I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Briggs and Stratton has a US heritage so could well be imperial sizes.

Is the right answer. Could even be BSF/BSW. Although Hayter is British
(I used to work with a member of the family).

It is UNF or UNC. UNC is coarse for cast iron. UNF is the more normal.
9.5mm is a shade under 3/8"

a 3/8" AF should have fitted it like a glove. Almost certainly a 1/4"
bolt diameter.

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Lucas Bergkamp

The Natural Philosopher wrote:
On 25/02/2021 19:21, Tim+ wrote:
alan_m wrote:
On 25/02/2021 18:28, Tim+ wrote:


I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

Tim


A layer of rust making a 9mm bolt oversize


Nope. Definitely 9.5mm

Nope, definitely 3/8"

Briggs are Yankee - its all imperial


Well I guess it is 3/8€� after all. Just seems odd that so many of the
engine bolts seem to be metric but not these ones. Live and learn.

Anyone happen to know what voltage the starter motors require?

Tim

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Please don't feed the trolls

"Tim+" wrote in message
...


Anyone happen to know what voltage the starter motors require?

Tim

normaly 12volt dont ever remember seeing a 6volt on any B&S

-

Mark wrote:

"Tim+" wrote in message
...


Anyone happen to know what voltage the starter motors require?

Tim

normaly 12volt dont ever remember seeing a 6volt on any B&S


Cheers.

Tim

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Please don't feed the trolls

"Tim+" wrote in message
...
The Natural Philosopher wrote:
On 25/02/2021 19:21, Tim+ wrote:
alan_m wrote:
On 25/02/2021 18:28, Tim+ wrote:


I cant believe that a designer decided that 9 mm would be too weak
and
that a 10mm would be too cramped for space.

Tim


A layer of rust making a 9mm bolt oversize


Nope. Definitely 9.5mm

Nope, definitely 3/8"

Briggs are Yankee - its all imperial


Well I guess it is 3/8€� after all. Just seems odd that so many
of the engine bolts seem to be metric but not these ones.

Bet they aren't metric either, just the one that has
the same spanner for metric and non metric.

On Sat, 27 Feb 2021 06:58:43 +1100, Fred, better known as cantankerous
trolling senile geezer Rodent Speed, wrote:

FLUSH the trolling senile pest's latest troll**** unread

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Bod addressing abnormal senile quarreller Rodent:
"Do you practice arguing with yourself in an empty room?"
MID:

On 26/02/2021 13:10, Tim+ wrote:


Well I guess it is 3/8€� after all. Just seems odd that so many of the
engine bolts seem to be metric but not these ones. Live and learn.


But have you looked at the actual threads? Just because a metric spanner
is a close fit to the head size doesn't necessarily mean it's a metric
bolt. Metric spanners are a good enough fit on many UNF and UNC bolts.
--
Cheers,
Roger