Just a quick question from australia while on the subject of bottom ends. I have a Starfire GT-80(66cc) and its ok till it revs high and vibrates badly. I have read specifications that the Skyhawk Super Rat 80(70cc) has a 2mm increase in stroke and revs to 7000rpm instead of 5000rpm like the starfire, but has the same size piston, will that crank and piston assembly bolt into the starfire crankcase to increase power, revs and smoothness??
