Coil amp.and volts

Your motor is putting out all its got.
I gotta believe your chasing a ghost.
Bone stock heads will barely rev over 5000.
With stock heads with mild porting such as yours, 6000rpms is pretty good.
You need better heads or monster porting.
If your looking for 6000plus rpms with those heads, talk to the guys that have been successful porting and running them such as
N2oMike or Joe Sherman Racing.

Okey thank´s for the jetting tip.I will change to a smaller size rear.
Maybe your right about my heads.Sounds not fun though.
Didn´t the old hipo´s spin really high with the stock heads?
Wish my wallet was thicker.
Thank´s Gresse