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We have found for stock bikes any oil in the primary will work some better than others, but if you are a big bore boy or a stroker nut ;that the synthetic gear oils,,,,,75/90 really make the clutch hook up. I have built 110hsp motors and used the stock clutch spring as long as you use the 75/90 in the primary,,,,,,if you use 10/40 or 20/50 in the primary on these style of motors you will need to upgrade the clutch spring,,,,,,its the way it works around here for us anyways.
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