Quote:
Originally Posted by Motorman_55792
This is a 2018 with low hours. Packing is good. Stock xc fmf pipe and also same with fmf fatty. O rings seal well. I have it jetted perfectly and have also added an RK Tek head since the stock head is very poorly set up. That added enough power to make it ok, but it still is not right.
This is absolutely a power valve function issue. I can't believe I haven't found any manual that states what rpm the valve should start to open or fully open!
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Probably because there is not any adjustments to correct if it is out of spec.
Have you checked ignition timing? If the key way is not aligned properly or sheared etc it will affect power.
Sorry I can not be more help but the gassy power valves are so simple they rarely go wrong. The only thing I have seen the early ones do was break off the small stud on the power valve plate.