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Bostwick, FL
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hypermoto
11/30/2020 7:57am
11/30/2020 7:57am
Hello,
I’m just curious as to the benefit of using a roller bearing for the stator side crank bearing. KTM, TM and maybe Beta? Use this setup.
I’ve always seen the ball bearing on the clutch side wear out quicker than they normally do on some KTM’s.
I guess my question is... why? And could you use 2 ball bearings instead? (Replace roller bearing with equivalent ball bearing?)
I’m just curious as to the benefit of using a roller bearing for the stator side crank bearing. KTM, TM and maybe Beta? Use this setup.
I’ve always seen the ball bearing on the clutch side wear out quicker than they normally do on some KTM’s.
I guess my question is... why? And could you use 2 ball bearings instead? (Replace roller bearing with equivalent ball bearing?)
Replacing the roller bearing with a ball bearing would likely require a small ball type bearing which would probably be better with thrust loads but much worse in radial loads.
Because the flywheel and nut on the clutch side kindof keep everything from moving in the axial direction, thrust loads arent that high. Its radial loads that are important to look at. The logic behind using both is likely that the single ball bearing will handle the thrust loads and the roller bearing will increase the total radial load capacity of the set of bearings.
And good, knowledgeable explanation kb228!
The Shop
Roller bearings handle radial loads better, ideal for the stator side with magneto drag. Ball bearings are good for axial/thrust loads, like the clutch side takes.
Personally i use Bearing MFG ball bearing and works perfect.
Ive seen every single brand of low hour piston and valve fail before. Change parts on enough bikes it's not a matter of if you get a failure from a bad part it's when. Seen a brand new 09 yz250 getting warmed up before the customer took it for a spin and loaded up. Piston disintegrated right there with minutes on it. Ive got a hot rods rod in a built 270f with over 300 hours on it we're runing it until its out of spec or blows. Just new bearings nothing else during bottom ends. Shit just happens.
That post is over 4 years old… but it’s no secret Pro X is not what it used to be.
Post a reply to: Roller bearings VS Ball bearings for Crank bearings