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    Head Stud Repair

    Just finishing a rebuild on my K1 CT70. I went to torque down the head and the top left stud (bike's left) pulled the studs clean out. I'm concerned that using a helicoil would cause the wall of the hole to be to thin and do the same thing over again. Does anyone have any suggestions as to a way...
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    Smaller Rear Sprocket

    Does anyone have any idea as to how much top end a 31 tooth rear sprocket would add to a K1? Also has anyone rode one at 55mph for any length of time?
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