Greetings everyone. I have been lurking for several months and have put to good use the jetting advice offered by JD, Clark and others. While woods riding this past weekend in southern Oregon, my '01 WR426 began making a squealing/screeching (bearing?)noise from the engine at 1/3 or greater throttle opening. Putting pressure on the clutch lever did not change the noise at all. The noise is audible in every gear and is definitely load related, not RPM or speed sensitive. Suggestions anyone? Oil is changed regularly with Castrol Actevo 10w/40 synthetic blend. Engine is unchanged except for YZ cam timing and revised jetting. Thanks for your input.