OK Evo folks...here's today's pop quiz.
The motor is a 1999 with about 100,000 mi. on it. NO changes or mods to the motor. I'm picking up a noise that I can only describe as "whirring" that I hear while the bike is in neutral, clutch is disengaged, sitting still, idling. The sound increases in speed as I rev the motor. Seems to be more right-side than anywhere. The bike runs great. Just got back from a little 400mi. hop with no problems, but the "whirring noise" continues.
Thanks.

 

What's the history on the cam bearing?

 

Original cam bearing. No changes in there from factory new.
fwiw: This is a '99 crate motor, bought "new in the box" and put in my 1985 FXRS in 2006.

 

Inner cam bearing is a 50K service item on motors that came with the later style, like that 99 crate motor.

 

Inner cam bearing is a 50K service item, along with lifters, on motors that came with the later style bearing, like our 99 crate motors.

 

Yup I'd be popping the nosecone and having a look at the lifters and cam.

 

Me too.

 

Me Three....

Having a cam bearing grenade is bad do-do. Swap out the INA for a Torrington. And while you're in there swap out the lifters too. MAW upgrade to a better cam at this time.

 

Been there What the guys said

WP

 

Me four. Get some EZ-swap pushrods and a cheap set of bolt cutters to make the work so you don't have to pull the rocker boxes.