so i have a mb165 or mini baja with a 5.5 i biult this motor port and polished cylinder head and it screamms.. but i want more i am about to order a gx140 e tube size 40 mainjet the biggest one that OldMiniBikes warehouse has to offer 18lb springs and an adapter and air filter i already have a homade exaust and i was wondering how a 4 degree advanced timing key would help out the motor has stock flywheel and rod but i dont turn it over 5500 even tho i kno i still need the billet parts but cant afford and i have another problem the bearings in my jackshaft ar toast i was thinking about fremovint the jack shaft and fliping the clutch and putting the to chains together and i saw a vid on youtube and tha dude did this and his mini ran 50mph via his gps but i want to kno those mods and the strait chain with no jack shaft would it still have decent low end power and not take ten years to get my 230 pound butt goin thanks for your opinion:shrug: