The ball-bearing needed to be replaced, but I did not have those bearings in stock. And then I took a look at the countershaft roller bearing and noticed the sizes were the same.
KTM actualy has this as an modification for their LC4 engines, all our LC4 engines have already been converted to a roller bearing. Coz the first part that fails on a LC4 engine (after 200-300 hours) is the ball-bearing behind the clutch leaving a big mess (cracked case).
I installed the bearing with special bearing lock-tite, it will never come out...
Mainshaft roller bearing conversion
-
- Posts: 0
- Joined: Wed Mar 10, 2021 10:41 pm
I have indeed never seen that bearing fail, however the one that was in there did not feel 100%.
The shaft stays in the original position. The spacer in front is the same as the spacers used in the swingarm for the axial bearings. I made the I.D. larger.
The LC4 bikes do not realy run at high RPMs. My street LC4 makes 5500RPM @ 60 mp/h.
The LC4 I used for MX racing did have that bearing fail (and cracked my case).
The shaft stays in the original position. The spacer in front is the same as the spacers used in the swingarm for the axial bearings. I made the I.D. larger.
The LC4 bikes do not realy run at high RPMs. My street LC4 makes 5500RPM @ 60 mp/h.
The LC4 I used for MX racing did have that bearing fail (and cracked my case).
-
- Posts: 0
- Joined: Wed Mar 10, 2021 10:41 pm
I would inspect that regularly if I were you (at least until you know it's ok). It's a long while since I had a tranny to bits but it looks like the shift-sleeve thrust will be pushing on the ends of the rollers when you are shifting gears.
If the ball-race gives no trouble I think I'd rather I'd keep it.
If the ball-race gives no trouble I think I'd rather I'd keep it.