Top end loss of power

[Fazerider]

[quote author=Fazerider link=topic=10871.msg115316#msg115316 date=1385737406]
Clutch slippage is quite obvious as it results in a rise in engine revs without any increase in speed, it's most likely at peak torque i.e. 8500 rpm with the throttle fully open. Doesn't sound as if that will be your problem if the only thing you notice is a speed limiter effect.
If the air intake is clear and the fuel supply isn't restricted (kinked fuel or tank breather hoses) then maybe it's the sparks... a TPS check might be worthwhile.

Which would be around that speed the OP said he tops out at in 6th! Although it would also be doing it in the other gears if that was the case?
[/quote]
Fair point. Having read his post again he does imply the revs continue to rise. Maybe he's not revving it much in the lower gears.