Hi - when I start my 05 Rev3 from cold it fires up immediately, but for the first few minutes running it hesitates and sort of misfires when you rev it. There seems to be a definite loss of power and it does not pull cleanly. This is even after leaving it ticking over for a few minutes before riding. however after a couple of minutes just tooling around, this problem disappears and the bike behaves perfectly with loads of power and pulls cleanly all day. I'm sure it didn't do this when I got it, but that was only a couple of months ago and as it's my first bike I may have been mistaken. I have stripped and cleaned the carb but it is still the same, and the air filter is cleaned regularly. Is this normal? and if not - what could it be?. Possibly the reed valve?

Any advice appreciated - Laurie.

When I bought the 07 I was advised to start it with the choke on (from cold) knock it off straight away and let it warm up for 10 minutes on tick over.

Whenever I do as I was told it all goes well... If I get impatient it is a little rough for a while

Thanks folks - looks like a common issue, and more a characteristic of the engine than a fault, so I won't worry about it again. Appreciate the feedback.