Fs 650

axtarmas · Mar 11, 2021

Hello to everyone in here,how are you??one question i will like to do,if is possible to find a answer,i bye a FS650 before months the engine is very clean probably the make service and live it like this for 10 years about,my question is i find a broken gear from the water pump i replace it with a other what i had spear but the center hall is 25mm and the other is 24mm 1mm difference,its a normal or the just place this gear???my water pump shaft is 24mm.its coming noise from the engine and probably its from this gear

Taffy · Mar 12, 2021

the 2001 has a different waterpump shaft and also so is the clutch basket, the primary gear and the intermediate gear....the one above the primary gear. finally, the freewheel gear which we also call the sprague inner gear is also just for 2001. these must all stay together.

a 2002-2008 has a different cut to each and all the gears and the water pump shaft has a a drop from 25mm to 24mm giving it a shoulder for the correct gear to sit on.

you cannot mix these two generations. if you mix them you get a 'wh-i-i-i-i-r-r-r-r-r' noise.

probably
the 2001 gears are the correct classic engineering cut. unfortunately they make too much noise. the 'whir' is not bad if all the correct 2001 parts are used.

for 2002 the gears were 'undercut'. this is done when the gears are all soft still. then they go off to be hardened.

the 2001 parts had the 2001 part numbers printed on them so i think that they knew something was up, that a year later they could get it all sorted out.

Taffy

axtarmas · Mar 12, 2021

THANK YOU Taffy you are the best

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