I apologise for this question to be (slightly ?) off topic but I`m
having a problem pull-starting my Mountfield Rotary Lawnmower .It has
the Honda GV100 engine and according to the User Manual it has a
transistorised Magneto system.

The problem appears to be no spark ,( proven with neon-timing light
tester ) but I`ve not had chance to investigate further.( I intend to
do this on Saturday in the daylight)

Has anyone any experience working on this type of Honda engine.

Any suggestions most welcome.

Scott


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"Scott Bowers" wrote in message
news:c41744eb42c5eaa0655cf6dccc833624.29066@mygate .mailgate.org...
I apologise for this question to be (slightly ?) off topic but I`m
having a problem pull-starting my Mountfield Rotary Lawnmower .It has
the Honda GV100 engine and according to the User Manual it has a
transistorised Magneto system.

The problem appears to be no spark ,( proven with neon-timing light
tester ) but I`ve not had chance to investigate further.( I intend to
do this on Saturday in the daylight)

Has anyone any experience working on this type of Honda engine.

Any suggestions most welcome.

Scott

Maybe the spark plug needs replacing.

"Cold Ethyl" wrote


Maybe the spark plug needs replacing.

No, it`s not the spark plug unfortunately.(Already changed)

There`s no spark arriving on the spark plug lead ( proved by using a
neon timing light tester )

Thanks anyway

Scott




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Scott Bowers wrote:

"Cold Ethyl" wrote


Maybe the spark plug needs replacing.


No, it`s not the spark plug unfortunately.(Already changed)

There`s no spark arriving on the spark plug lead ( proved by using a
neon timing light tester )

Thanks anyway


This is the point I give up, and send it in.

Unless its a simple broken plug lead?



Scott

In article ,
The Natural Philosopher writes:
Scott Bowers wrote:

"Cold Ethyl" wrote


Maybe the spark plug needs replacing.


No, it`s not the spark plug unfortunately.(Already changed)

There`s no spark arriving on the spark plug lead ( proved by using a
neon timing light tester )

Thanks anyway


This is the point I give up, and send it in.

Unless its a simple broken plug lead?

If it wasn't electronic, I would say it was the contact breaker or
capacitor. I've no idea what replaces these in an electronic magneto,
but it probably isn't repairable other than by a new electronic unit.
Another possibility is moisture has got into the HV coil and the
insulation broken down, but they are usually pretty well waterproofed.

--
Andrew Gabriel

The problem appears to be no spark ,( proven with neon-timing light)

I had a problem similar to this several years ago where the lawnmower
sometimes ran erratically and then finally falied to start. I proved
that it was due to no spark by taking out the spark plug, resting it on the
metal engine and looking for a spark when the starting cord was pulled..

I eventually traced the fault to the switch that controls the switching off of
the engine . This is connected via cable to the operating lever on the
handlebars that you have to hold ON when you are using the mower.( When
released , it earths the spark plug lead via this switch preventing firing at
the sparkplug and also applies a mechanical brake to the flywheel)

It was fairly easy to prove using a multimeter and if I remember correctly , it
was due to a sticking plunger that operated the microswitch. I cured it by
cleaning it up and lubricating it with a small squirt of WD40.

It`s ran OK ever since.

If that`s not the problem , then I would suspect the magneto , but magnetos are
usually very reliable.


If you want any further info then email me and I`ll see if I can help as I`m
still using the mower.

Vic

"Scott Bowers" wrote in message
news:c41744eb42c5eaa0655cf6dccc833624.29066@mygate .mailgate.org...
I apologise for this question to be (slightly ?) off topic but I`m
having a problem pull-starting my Mountfield Rotary Lawnmower .It has
the Honda GV100 engine and according to the User Manual it has a
transistorised Magneto system.

The problem appears to be no spark ,( proven with neon-timing light
tester ) but I`ve not had chance to investigate further.( I intend to
do this on Saturday in the daylight)

Has anyone any experience working on this type of Honda engine.



I have an ISEKI mower with a Honda engine, I have had the electronic
'Ignitor' chip fail twice.

There is no spark at the plug when it happens - I know there are loads of
other reasons that could be the cause, but as it has happened twice, maybe
they are unreliable on Honda small hp motors

Rick

Thanks for all the suggestions , especially the last one.

The fault was due to the operating spring on the engine on/off switch
being undertensioned.

This meant that the switch was never fully operated , even when the
handle was pulled in the full on position.

I`ve taken it off and retensioned it and it now runs OK.

Thank goodness for that. I had visions of faulty electronics in the
magneto circuit so it certainly doesn`t pay to jump to conclusions.


I bought this version of lawnmower mainly because of the well known
reliability
etc. of the Honda engine

Thanks everyone.

Scott





The problem appears to be no spark ,( proven with neon-timing light)

I had a problem similar to this several years ago where the lawnmower
sometimes ran erratically and then finally falied to start. I proved
that it was due to no spark by taking out the spark plug, resting it on the
metal engine and looking for a spark when the starting cord was pulled..

I eventually traced the fault to the switch that controls the switching off of
the engine . This is connected via cable to the operating lever on the
handlebars that you have to hold ON when you are using the mower.( When
released , it earths the spark plug lead via this switch preventing firing at
the sparkplug and also applies a mechanical brake to the flywheel)

It was fairly easy to prove using a multimeter and if I remember correctly , it
was due to a sticking plunger that operated the microswitch. I cured it by
cleaning it up and lubricating it with a small squirt of WD40.

It`s ran OK ever since.

If that`s not the problem , then I would suspect the magneto , but magnetos are
usually very reliable.


If you want any further info then email me and I`ll see if I can help as I`m
still using the mower.

Vic




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