engine running lean 1 cyl!

brylon644

brylon644

Location
buffalo ny
Road my superjet yesterday, and the rear cylinder is not getting fuel or is getting very little. The plug is hardly black. I can look in the rear cylinder and see its pretty much dry compared to the front. Easy to tell cause I am running 33:1 for break in. I pulled the carbs off and checked both the pump side screens and the jets side. Both jets and screen were spotless clean.
My question is... What would be the reasons to cause the rear to get very little fuel? And where should I go from here with figuring it out? Oh and I have a 62t with dual 38 carbs on it.

Thanks for all advice in advance
 
rwilliamtaylor

rwilliamtaylor

Ride, Wrench, Repeat
Location
San diego
Are you running two fuel lines from your tank? I had a split in one of my pickups inside my kart tank that made a cylinder run lean.


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Vumad

Vumad

Super Hero, with a cape!
Location
St. Pete, FL
Not enough fuel and too much air are about the same thing. Did you leak down your newly rebuild motor?

My x2 is modified and I'm running 2 jets larger in the rear carb than the front. Just the way the motor loads. Was tuning and rear cylinder wanted more fuel, I gave it, ran stronger and crisper.
 
rwilliamtaylor

rwilliamtaylor

Ride, Wrench, Repeat
Location
San diego
Unless I'm missing something, his problem is probably not leak down. A leaky seal would not lean out only one cylinder... would it?


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