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Ok ill check it out tonight and see if bearings are bad but I'm pretty sure there good there's a air leak somewhere can't figure out where guess I'll have to seal it it

There's no fuel residue on Block anywhere didn't see any cracks on it either do u think I need new head shims maybe idk

Ok I have a nitro rustler 2.5 engine having problems with it revving high rpms when sitting still ripped out 2 new spur gears it has a new carb on it new fuel lines new clutch engine is only 2 years old ran a gallon through it buddy thinks it's sucking air through crank seals they look good to...