I had a problem with a Venom 12.25:1 piston coming up too high and kissing the head on the left and right side of the dome.I have a 05 trx 450 501 build 3 mil crank venom 14.25 piston cw cylinder venom porting hc111 esr intake everything worked fine after I built it until today now it seems to be losing power once it gets around 200 degrees any body have any problem like this.[/b]
Have you clay checked your clearance there? May want to open her up and look at that piston.
I'm glad I did.