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constantly ripping valve stems off.

17 posts in this topic

i am using a michelin m 12 rear, and i think a motion pro (?) rim lock. the lock is all rubber on the outside and its always tight, but i have torn the valve stem off of 2 ultra heavy duty tubes.

and the tire is spinning on the rim again! both the valve stem and the rim lock are angled like they are twisting from acceleration. :thumbsup: this is from one day at the track.

is it the tire or the rimlock? or do i need to drill another hole and use 2 rimlocks? :devil:

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There are 2 rimlocks on the rear wheel stock.

Make sure your rimlock is compatable with the rim and engages the inner bead properly.

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I have (2) rim locks on my 02 YZ426F....... Matter of fact I just replaced one of them last weekend because the stem had moved a bit.

I also bought some way cool rimlock adapters from FASSTCO that are supposed to keep that from hapening again.

Bonzai :thumbsup:

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SFO is pointing you in the right direction - the rim lock is likely for a smaller rim. My stock YZ rim has provisions for two rim locks, but came with one from the factory. If you can, get a factory rim lock. The tip on not tightening the valve stem nut is very important too. I usually finger tighten the nut against the valve stem cap, as I find if it's loose it can vibrate back down against the rim. If it's loose, you can have some slippage and not rip the stem.

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Make sure the rim lock is the correct match for your rim. I.E.: 2.15 rim lock for 2.15 rim (it's on the lock) a 1.85 on a 2.15 or a 2.15 on a 2.5 will do exactly what you are experiencing. Also, Hondas have a neat sleeve that slides over the valve stem instead of using the lock nut.

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Make sure the rim lock is the correct match for your rim. I.E.: 2.15 rim lock for 2.15 rim (it's on the lock) a 1.85 on a 2.15 or a 2.15 on a 2.5 will do exactly what you are experiencing. Also, Hondas have a neat sleeve that slides over the valve stem instead of using the lock nut.

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Make sure the rim lock is the correct match for your rim. I.E.: 2.15 rim lock for 2.15 rim (it's on the lock) a 1.85 on a 2.15 or a 2.15 on a 2.5 will do exactly what you are experiencing. Also, Hondas have a neat sleeve that slides over the valve stem instead of using the lock nut.

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you may want to "Make sure the rim lock is the correct match for your rim. I.E.: 2.15 rim lock for 2.15 rim (it's on the lock) a 1.85 on a 2.15 or a 2.15 on a 2.5 will do exactly what you are experiencing. Also, Hondas have a neat sleeve that slides over the valve stem instead of using the lock nut. "

Just Kidding YZDAD

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It happens all the time on mine. When I notice it getting bad I just put the bike up on the stand, deflate the rear tube, loosen the rimlock and put it in 1st gear. Then I grab the tyre and spin it anticlockwise. One good pull is enough to straighten the valve stem up. :devil::thumbsup:

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ive heard of that trick and im gonna try it. i was sure to get a 2.15 rimlock, and i tighten that SOB down. im running 16 psi in the back too.

ill be sure to get a factory rimlock, maybe 2. at least now i know what that rubber plug is on the rim. :thumbsup:

i thought it was the inferior michelin causing it, because its been giving me nothing but problems since i mounted it... ive gone through 5 tubes on this one tire.

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Hey! I really don't know what happend...........happend..........happend.........happend, oh now i do.......... :thumbsup:

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How much pressure are you running out of curiosity? I vote rim locks too. My 01' is in the boat that came with a rim with 2 holes for rim locks but only one installed.

A second trick for straitening the tire, that also works on the front, is put it on the stand to freewheel (neutral) and give it a good spin. Then slam on the brakes. The tire should rotate back into place (assuming you spun it the correct direction). Also make sure the tire is deflated.

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Hey! I really don't know what happend...........happend..........happend.........happend, oh now i do.......... :thumbsup:

:devil:

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