How do I make my 600 fazer faster?????

[nick crisp]

From what I can gather, the idea is to increase fuel flow to the combustion chamber. This can be done via camshafts either by increasing lift of, or by increasing the duration of opening of the intake valves. But there are some things to be careful of. You must have sufficient valve to piston clearance for the lift you wish to achieve. If you take 2 cams with identical duration but one has higher lift, the valves on the high lift example will open more rapidly. This is desirable as you should strive for the nearest to instantaneous opening that you can achieve (actual instantaneous is impossible). However, at extremes it can result in valve bounce, where the valve is effectively propelled by the speed of opening rather than following the cam profile. To counter this, you could use heavy duty valve springs which would give more control over how the valves open. I think maybe high lift cams would also make the engine more peaky? (i.e. less torque/mid range but more top end revvy). That's about as far as my understanding goes, and I'd be interested to hear from someone who really knows what they are talking about!