Yamaha Banshee
Do I need to have my engine case modded for the 10 mil... i'm using 33mm keihin carbs on a 10 mil cheetah kit, noss head with 72mm pistons from cascadeinnovations.com.. making it a 521cc motor.. what i wanted to know is.. what kind of jets should I use ( i'm on sea level)..with all these new...