Maintenance & Technical > KX250 / KX125
rear axle help .
eprovenzano:
That's what it was on mine, the chain was over due to be replaced. New sprockets front and rear, and a new chain, and all is well.
blackkx:
i am gonna replace the chain and sprockets , i think you guys are right the chain block wore through and the chain is rubbing the aluminum on the guide . Result - the chain has scratch marks in the side of the links and i dont trust it anymore . the teeth on the rear sprocket are fine but the front teath are starting to bend , i already ordered the chain block yesterday. via dennis kirk . I am thinking of changeing the sprocket sizes to favor a little more top speed , sizes now f13t r52 , what do you guys suggest ? will minor size change be that noticeble ? I ride mostly motox and trails , the trails are where the 450s leave me trying to play catch up . :x :x :x
Danger4u2:
Bigger sprocket on the back and smaller sprocket on the front will give you more low end. Smaller sprocket on the back and bigger on the front will give you more top end speed. Yes small changes in sprockets does make a difference. I'm making my K5 more woods friendly. Adding a flywheel weight and going from a 47 tooth rear to a 50 maybe 52 tooth. If you go to big or to small on the front sprocket you run the risk of the chain eating into the motor case.
BrokenSpoke:
On my '04, I run a 13/49 for MX tracks, 14/49 for HS and GP's, and a 15/49 for desert. The 15/49 tops out at 85, plenty fast for me.
kx666:
keep in mind changiong one tooth on the cs sprocket is almost equal to 3 teeth on the rear. i like to try to keep smaller rear sprockets to miminize chances of hitting stuff. there is a gearing calculator somewhere on this site.
~stevre
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