Carbon Quiz ?

old shed finds

Well-Known Member
#1
All of our 5 hp experts what the heck made this engine build tons of carbon around the valves and have a perfect clean piston.. ?
It's been on a Tote Gote 2 years with hour or two riding trips...Too cold of spark plug? Premium 91 octane fuel?
Two years ago it was spotless clean with new intake valve...
 

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old shed finds

Well-Known Member
#4
How's the wash pattern on the head? Lots of variables but using too high of an octane rating than the engine needs can cause incomplete combustion. Are you at higher altitudes out there in Utah?
We are a mountain state high altitude.and I would bet you are right on as mentioned the premium fuel..The engine is a stock condition nothing fancy so the high octane burns slower results are a carbon mess...
 
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