Not much info here. Is this a stock crank? If its not true and welded I'd stop where you are now. Do a compression check, make sure your jetting is spot on do a plug chop. If all is well just let it rip! Once your ready to pull the motor, sky is the limit. Figure out your budget and call a sponsor. There's so many choices, porting , carbs, better pipes. You could decide to go with a cub build or w/e! But for now if your crank is stock your pushing it! So I'd just check compression, and jetting and just ride it