Hi there,
You're literally describing the characteristics of the big bore engine. It's not going to rev like the OEM setup, a big bore kit will drop over revs and this sounds like it's in the right ball park figure.
I'm not saying 9500 is the limit, but this is definitely past its peak power and I wouldn't expect any power gains past here.
The next step for retaining revvibility will involve more drastic tuning.
Zeeltronic CDI Ignition System
Allows you to have a fully derestricted ignition system
Customise powervalve for the Athena kit
Squeeze out a few more RPMs
Cylinder porting
Greater volumetric airflow through the cylinder
Allowing it to breathe easier
Transfer window porting
The transfer windows most likely need porting due to the larger bore
Gasket match the cylinder to the cases
Porting the cylinder base removing the obstruction to airflow from the reedvalve
Air flow is greatly disturbed by the cylinder spigot protruding into the intake
Fit VForce4 Reed Block from Blaster
Proven to increase mid-range and overrev performance
Boyseen dual stage reeds can also help but seeing as your requirement is literally at the top end of the powercurve then you don't want dual stage
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Just bear in mind, you're now demanding a lot more from the engine than stock and seeing as you're seeking peak power you're going to want supporting mods.
Uprated clutch springs to avoid clutch slipping
Forged connect rod to resist rod stretch/fatigue
Forged light weight piston to withstand the demands
