I found this on another site and do not remember seeing it here and thought maybe it was interesting or is it BS.. SORRY IF IT WAS POSTED BEFORE..

Here's a trick to reduce the constant engine noise that sounds like valve train noises on the newer 96 Cu In. bikes that have the auto adjusting primary chain tensioners and no inspection port.
I tried this on my RKC and can notice a definite improvement. The problem seems to be coming from the primary chain and not really the valve train at all.

Here's what you do. Accelerate from a stop in first gear rather hard to about 30 MPH and then brake rather hard using only the rear brake without locking up the wheel and don't pull in the clutch until the bike slows enough.
Do this 2-3 times in succession and you'll notice that the noise that you thought was the valve train is almost completely gone now. Low speed riding is a bit smoother also due to less play in the chain.

By doing this, the automatic primary chain will ratchet up a bit tighter if it was loose before this. The acceleration and braking causes slack in the lower strand of the chain and will ratchet it up tighter if it needed an adjustment.

If it wasn't loose there will be no noted difference.
That is most likely the noise that was heard and not the valve train at all.

 

i was getting noise today on a 100 mile ride. i didn't like the extra noise, and was gonna get it checked out in the am.

on second thought i'll just get the bad boy checked out in the am. i'll be due to tighten everything up at 1000+ miles by this weekend.

 

Careful. if you lock up the rear wheel enough and often, this is one thing that causes crank wheels to shift.

 

I hope nobody thinks that actually causing the auto tensioner to get TIGHTER is going to be a GOOD thing!