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Message started by Armen on 07/09/17 at 10:18:09

Title: Crank main bearing
Post by Armen on 07/09/17 at 10:18:09

Some time ago, there was a question about splitting the crank case. I just pulled one apart. FWIW, the right side has a conventional ball bearing, and takes a bit of bashing with a soft mallet to get the crank out of.
The left side uses a roller bering. So, if I were to do this again, I'd remove the left side case off first, because it slides off easily. Empty the innards, then tap the crank out of the right side case.
The logic is that aluminum expands much more/faster than steel. By using a roller bearing on the left, the crank can grow when warm and not side load the left bearing. The ball bearing on the right keeps the crank where is should be.
I did a similar mod on our Bultaco racer a few decades ago.
I believe the other reason was that the larger surface of the rollers allows more load, so the massive weight of the flywheel assembly doesn't murder the left bearing.

Title: Re: Crank main bearing
Post by Armen on 07/09/17 at 10:20:41

Like so:

Title: Re: Crank main bearing
Post by justin_o_guy2 on 07/09/17 at 10:56:06

I hope I'm never glad I read that.

Title: Re: Crank main bearing
Post by Armen on 07/09/17 at 12:00:19

Only reason I have it apart is because I'm an idiot. Wanted a bare set of cases to make a nice motor stand.
Gee, wonder how long it'll be before someone offers a stroker crank for the beast? ;)

Lancer?
Versy?
Dave?

Title: Re: Crank main bearing
Post by verslagen1 on 07/09/17 at 12:10:13

The disadvantage to that is the shifter.
Taking off the right, you don't have to mess with it at all.