Fuel Rich in front cylinder

[TomToth007]

Fuel is too lean in front cylinder
Tried everything else.
Some back firing when riding.
Gap good on spark plugs.
No leaks Anywhere,
Read before about a petcock screen
In fuel tank may have something to do
With it... Any body got any suggestions
2006 pitbull 117 CI motor SS

 

[KaptinAmerika]

How did you check for leaks and what is leading you to believe the front cylinder is "LEAN" compared to the rear cylinder?

 

[Sven]

1. What is the compression of both cylinders or begin to chase your tail.
2. Does the bike start fast all the time? Does it idle real low? Then, no air leak.
3. Is there one ignition signal like split down the middle? Yes. Then, they both fire equally.
4. Are the cylinders the same height? Pistons interchangeable? Yes. Is TDC the same?
5. If the engine was used as a prop engine for a plane, would the cylinders have even heat so it would also be even cooling going across each cylinder in that position?
6. Would those plugs look all even color if the airplane engine was in said position sans a worn valve guide and what color that can show, if the airplane effect was in play and we cool all even up.