Vintage Dirt Bike Q & A

Anybody got a good method for removing The mainshaft needle bearing in the left side case of a cr 125. The bearing is in a blind hole and is no longer availible. I need to transfer it from one case to another and not destroy it.........steve

I've read posts of people heating their cases to 250F, knocking them on a flat surface, and having all the bearings fall right out. I think I'd have to see this to believe it - and since my cases get up over 200F all the time, I surely hope it's not true. On the other hand, I'd think slowly heating the case to 450F and knocking it down hard on a flat surface might work, possibly with a heavy, powerful disc magnet centered on the inner bearing race (I've never done any of this, and high heat won't make the magnet happy, so take it for what it's worth to you).

Try a Google search for the 91016-360-006 bearing; you might be surprised what you find. Suzuki also makes a 15x22x12mm bearing (P/N 09263-15012) which may make a usable sub for the other gearbox needle bearing (91014-360-006). I think all the ball bearings are still available OEM.

Ray

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'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric

i would think a good bearing store could fix you up

Blind hole bearing remover kits like the one from tusk may do the job. Heating the case works and so does cooling off just the bearing with one of those do it yourself wart freeze cans. You will use up the can pretty quick but you can get the bearing frosty if its not too big. It should just fall out with a tap at this point. It helps to use a heat gun to reheat the case a very little. Do this after you try just tapping it out and it doesn't drop.

Nothing to sweat but don't force it out, this means you're not doing it right.

lastly, I think you can find a new bearing if you look hard enough. Look by the size of the bearing and not the model bike you have.

good luck,
nola_fiddy

I am in the middle of the same job you are doing. I have a blind bearing puller set from Harbor Freight Tools and it did a find job of removing that bearing - while disfiguring it a bit of course. That bearing is a common size and my regular bearing shop sourced an exact replacement with no trouble. If you are set on heating and slamming, that does work, that's how I was taught to do it back in the old days.

Can this bearing be removed hydraulically by packing it full of grease then compressing the grease in the center & forcing the bearing out?

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I had a donor case that had a good bearing. I took a socket and press and broke the back of the case out and got access to the backside of the bearing and pushed it out. Now I will work on getting the defective bearing out of the good case.