So i have a drag bike and gearing is 17/38. Pulls hard through 1st 2nd, 3rd, and mid way through 4th it stop pulling as hard and then picks back up into fifth. I was thinking jetting but then i thought that full throttle the entire time so main jet should not be the issue cause it would have lagged out the gate. I am not shifting to fast cause it hits 4th and pulls then half way you can feel the pull lighten up and come back.
Cub is not ported, i am running shearers, fresh plugs, running 38 pwk so should be plenty of fuel for motor, wires were new as of nov 2012 but only about 2-3 hrs on bike. I am thinking porting will fix issue but just wanted to make sure there isnt something else i am missing that could be a quick fix. Another rider rode and felt the same thing as I did.
Please provide thoughts