The last two times I have taken out my RXT for the first 20 or 30 min the RPMs at WOT have maxed out at like 5800.. And then after a few mins it slowly goes up in short bursts to mid 6500s. Then after like 20 min It starts to hit the 7000s in short bursts from 5800 to the 7000s. And after about 30 mins its fine and goes all the way up to 8000... Then for the rest of the day it runs fine. Even with 3 or 4 hour rests in the middle of the rides it runs fine. The super charger has metal washers and does not have any play in the impeller. Any ideas of what to check or which way to start?