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  1. 10mil 521cc Case Trenching?

    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...