Hi the fan on my 02 fazer 1000 keeps on coming on when starting the bike even when the engine is cold. restart and it does not come on right away. it seems intermitent. Paul

check the thermostat is working it may be stuck closed!
if it is change it

Give your bike a tune up, Plugs , Air filter, clean the carbs. Do these jobs one at a time till the problem goes away, Dirty fuel from leaving the bike unused can also give grief.
Happy hunting

probly need a clutch ajust or rebuild-buy a haynes or clymer manual it contains detailed procedures

Pull the new spark plugs and compare them to a condition guide which should tell you if fuel is too rich/lean. souns like running rich.

You need to determine why the fan is on (stuck relay, bad sensor etc.) If it remains on, the computer keeps engine controls in "cold-start" mode and will not operate properly. (re-check codes after the fan works right.)

Hi john.Has the bike been sitting unused for a while if so try so carb cleaner in the fuel tank

Does the chk. engine light come on when it does this? It is normal for it to rev up some when you first start it 2500 is a lot, but not really that bad if it comes back down within 2 or 3 secounds (depending on the outside temp might be alittle longer). there is a couple of things that could cause this One is the T.P.S. Throutle positioning sensor, Two I.A.S. idel air sensor. You did not say if it does this just when its cold or all the time even when its warm. It will do that when its cold but should go away when it warms up. If it does not go away when it warms up i have to say its one or maybe both of them sensors.