I seem to be having a problem with my scoot. It feels like it is dragging and or surging while at a constant RPM. I tried the WD-40 thing on the intake manifold but I didn't notice any change in RPM. So I don't think that there is a vacuum leak there. When I'm cruising along say at 45mph I can feel a distinct drag / surge that almost feels like its jerking slightly. If I pull in the clutch it stops so I know that its not brake or wheel bearing related. It has stage 1 air cleaner, screaming eagle 16ga. double barrel exhaust, stage 1 download and 34,000 miles. It has had these mods since day one and is other wise stock. Any ideas?