I got a big bore motor and I am trying to jet a set of fcr carbs and was wondering if someone could help me out. I got a aluimum airbox, big gun full exhaust and a big bore motor. Thanks!!![img]i/expressions/face-icon-small-confused.gif[/img]

 

Need more info on the big bore motor,what size piston and cam and what is it bored toooo...686,690,727..

 

I got a powroll 770 kit in it. Thanks!!!!!

 

It starts but it just backfires and pops I think I am way to lean what do you think?