Pstn head
TY 4 Stroke Master
Not exactly sure which primary clutch arms I have, i believe there a Yamaha part # 8gr -10, sorry can't remember exactly but they are much steeper angle than the factory ones with only 2rivet weights compared to the 3 rivet weights from factory. At the heel I have rivet and 1 washer, at the tip I have just a rivet ( I'm not sure about the weight of the rivets and washer ). I was hitting only 8400rpm and settling at 8000 to 8200rpm so I ground down the tip weights both sides and left about 1/16" th of material on each side of the tip rivets, the heel rivets I didn't change. By doing that I now see 86 to 8800 rpm and settles at around 84 to 8600 rpm. Is there anything I could do to bring the rpm up another 2 to 400rpm? I weigh around 190lbs with gear on and ride 99% trails.
radianguy
TY 4 Stroke God
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- 2009 Yamaha FX NYTRO XTX 1.75
Without knowing the specs on your weights youre shooting in the dark, but you need to remove more weight from the tip by the sounds of things.
