My Vanguard V twin began searching, racing up and coasting down, racing
up and coasting down. Like the acceleration jets were fine but the idle
jet was plugged. Not so. It has a fuel solenoid on the side of the carb
that pulls open when you turn the key on and of course closed when you
shut the key off. I guess so it won't diesel or let gas continue to flow
while it is coasting off.
Apparently when the engine gets hot it gets weak or fails to work. The
engine thinks you are shutting it off but is still working so the
governor kicks in to bring it back up to speed then dies again and so on.
The fix was removing the solenoid cutting the solenoid pin off with dikes
and replacing it. Runs like a clock now. Another piece of EPA bull crap
It used to be that one had to remember to shut off the gas or it could
seep past the float valve and flood the cylinder and crankcase. The
solenoid shuts it off automatically. I think it's a great idea.
After ten years or so, my BIL's riding mower would shut off
unpredictably. I found that the solenoid wasn't staying energized. It
was a bad connection and easily fixed.
In all the years before the EPA I never had or herd of anybody filling
their crankcase with gasoline with a faulty needle valve. My gas tank is
lower than the engine and there is a fuel pump. It can't flood.
I check the wiring before and no problems found.
I look outside this morning and everything was in 3D!
Aren't fuel tanks usually higher than carburetors? I've seen several
small engines with gas in the crankcase because the valve hadn't been
turned off. I seem to have been wrong in assuming that the solenoid was
to prevent that.
The mower was a John Deere with a Kohler engine. The Deere manual
didn't mention the purpose of the solenoid, but Kohler apparently says a
modern engine should be shut of at full throttle, and the solenoid
I idled the Deere down before shutting it off, and it normally backfired.
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