took apart the black bike and it turns out it has a vitos +3 stroker in it which sucks because that motor is a piece of sh** the thing boggs and has a oil leak. the guy i bought it off of is a moron because he ran it with the little bottles of weed wacker oil u get at lowes and deided to mix the gas with thatX(X( so anyways there is only a little blue on that crankshaft and now it is pure black with a little blue and that poor crankshaft and it was a stroker