Am yet to go down the performance enhancing route, but I believe the cat system on the kle is very restrictive. a "proper" exhaust would help considerably, but the carb jetting would require modifying too.
The cam profile on the kle is softer for a smoother low rev performance (alledgedly, my 2006 wouldn't pull the skin off an egg custard). gpz cams may sort that and take the power back upto the 50bhp mark.
I have no info on the ignition system.
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Harley Davidsons,
The most effective way of turning petrol into noise without the side-effect of horsepower
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