Hi,

Just had a look at your other projects after reading your post about the
boat trailer guide. I noticed your problem with the power washer engine
varying in speed, or "hunting". I had the same problem with a B&S 8.5 hp
engine last month, and every so often the engine would stop completely.
I tried just about everything possible without dismantling, but with no
success. In the end a friend and I reluctantly took the carburettor
apart and discovered the problem. The engine had stood for a while and
had obviously been filled with bad (water contaminated) petrol. The
water had caused corrosion inside the carburettor bowl and as the petrol
had evaporated it had left some sediment in the tank and pipes too.
Every so often a piece of crud would block the carburettor jet or cause
the float to jam, which made the engine slow down. If the piece of crud
came free, the engine would speed up again, otherwise it would stop. I
left the dirty parts of the carburettor soaking in xylene for a while,
then cleaned them up with a little brass brush. Now the engine works
fine again.

Hope this helps,

Chris

Christopher Tidy wrote:
Hi,

Just had a look at your other projects after reading your post about the
boat trailer guide. I noticed your problem with the power washer engine
varying in speed, or "hunting". I had the same problem with a B&S 8.5 hp
engine last month, and every so often the engine would stop completely.
I tried just about everything possible without dismantling, but with no
success. In the end a friend and I reluctantly took the carburettor
apart and discovered the problem. The engine had stood for a while and
had obviously been filled with bad (water contaminated) petrol. The
water had caused corrosion inside the carburettor bowl and as the petrol
had evaporated it had left some sediment in the tank and pipes too.
Every so often a piece of crud would block the carburettor jet or cause
the float to jam, which made the engine slow down. If the piece of crud
came free, the engine would speed up again, otherwise it would stop. I
left the dirty parts of the carburettor soaking in xylene for a while,
then cleaned them up with a little brass brush. Now the engine works
fine again.

Just another thought. If the speed varies with a very regular period of
6 seconds, I doubt it will be a "crud problem". Crud problems will cause
more random variations in speed. In this case you might want to take a
look at the governor mechanism, but I can't really help here as I've
never disassembled a B&S governor.

Best wishes,

Chris

Ignoramus26696 wrote:
Thanks. I will save your post and perhaps one day look into the
carb. As of now, it works relatively acceptably, perhaos something did
come free and then dislodged, as you mentioned. I appreciate you
thinking about me.

i

No problem. If it works, let it be. I was hoping after a few minutes
running this would happen with my engine, but it was just too crudded up
and I had to clean it by hand.

Chris

Ignoramus26696 wrote:
Thanks. I will save your post and perhaps one day look into the
carb. As of now, it works relatively acceptably, perhaos something did
come free and then dislodged, as you mentioned. I appreciate you
thinking about me.

i

No problem. If it works, let it be. I was hoping after a few minutes
running this would happen with my engine, but it was just too crudded up
and I had to clean it by hand.

Chris

Also caused by a lean carb mix.
--
Steve Williams

"Christopher Tidy" wrote in message
...
Hi,

Just had a look at your other projects after reading your post about
the
boat trailer guide. I noticed your problem with the power washer
engine
varying in speed, or "hunting". I had the same problem with a B&S 8.5
hp
engine last month, and every so often the engine would stop
completely.
I tried just about everything possible without dismantling, but with
no
success. In the end a friend and I reluctantly took the carburettor
apart and discovered the problem. The engine had stood for a while and
had obviously been filled with bad (water contaminated) petrol. The
water had caused corrosion inside the carburettor bowl and as the
petrol
had evaporated it had left some sediment in the tank and pipes too.
Every so often a piece of crud would block the carburettor jet or
cause
the float to jam, which made the engine slow down. If the piece of
crud
came free, the engine would speed up again, otherwise it would stop. I
left the dirty parts of the carburettor soaking in xylene for a while,
then cleaned them up with a little brass brush. Now the engine works
fine again.

Hope this helps,

Chris





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