cause of lean cylinder condition

J

jclee71

Member
Joined
Feb 26, 2005
Messages
46
Location
New Jersey
What would cause a plug to lean out mid and open throttle, mag cylinder white , rest look perfect, cleaned carbs, no change, engine runs good, cylinder temps seem about the same, just dont want to burn this cylinder down, I have an identical sled in the fleet that runs great, what could I swap out to diagnose, should I start with plug wires, coils, I just dont understand!
 
air leak. check the crank seals and the carb boots while it is running with brake cleaner and see if rpms increase.
 
I will check tomorrow, I went through carbs, checked airbox, boots, etc, if it’s not crank seals what else could it be?
 
I figured it out, because I fouled a plug i put a new plug in that cylinder, it ended up just being the plug, maybe because it was new it takes more than a few miles to change color or it just was a weird plug but when I put a used plug in its all good
 
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