wont rev above 4500

[DannyMotor]

Im going to try de-oiling the KnN filter... then just 'lightly' oiling it. It may be too restrictive.

[platinum2]

is the valve cover vent clear? how about the intake manifolds, " carb boots on motor side" could they be leaking and sucking to much air at higher revs?

[Mop Bucket]

I had a very similar issue and went through checking everything on the bike. The problem ended up being crap in the tank. That crap went in to my carbs and I had a 4500 Rpm limit.

I cleaned everything again, tank, filter and most importantly the carbs. Once it was all cleaned I was burying the needle on the speedo and didn't have a rpm limiter.

You said you had sediment in the tank so you need to clean again. My filter looked clean too, but, there was still junk in the carbs.

[DannyMotor]

Jesus tap-dancing christ!

Well... Apparently... IT WAS THE AIR-FILTER!!!!

I just washed the KnN... let it dry, went over it with a heat gun (lightly, just to quicken the process) re-installed dry...

THE THING IS A FRIGGEN BEAST!!!!!

1100rpm to 9000rpm without a hickup! Smooth as silk.

Live and learn, and let this be a lesson... do not over-oil your air filter.

Wish I knew that a week ago. Thanks for all the suggestions guys! I knew I wasn't crazy!

[steveu812]

I never would have suspected this issue, but it was the problem with my bike too. Wouldn't rev past 5500 under load. Removed the K&N and she runs to redline no issues!

Thanks to this forum - this is awesome!!

[Seana23]

Good on ya Danny.
...and Steve too!
Well done.

So, what jetting and needle settings did you end up with?

Xxx