Layshaft bearing aftermath

Let's be clear: THIS IS NOT MY BOX.

Sure, I've done some bad things but not this... yet.



I guy I met at a bike show needs some help. He tells me that his kickstarter is flopping down when riding and I tell him in no uncertain terms that he is to stop riding it immediately....

So his question is, can this be welded up or should he look for a new shell?

Look for a new shell....and a roller bearing.

When i was very a young and stupid 17 year old i had exactly the same thing on a dommi. Like this one the face for the outer race was intact.
My old man took a lick across the external face of the damaged area of the box with an end mill, just to create a flat surface, drilled and tapped 3 or 4 say 1/4 holes, - piece of about 1/4 ally plate, countersunk socket heads, gasket etc, and bobs yer uncle.
I did the best part of another ten thou on that bike. I know the bikes still around, who knows, perhaps it's still got that plate on the box.
Terry

comnoz said:

Look for a new shell....and a roller bearing.

Click to expand...

I assume it would cost more than a used shell but in theory couldn't one mill a circle out and machine up an interference plug and save the box? It almost looks like it hasn't cracked between the bearings... yet. :mrgreen:

swooshdave said:

comnoz said:

Look for a new shell....and a roller bearing.

Click to expand...

I assume it would cost more than a used shell but in theory couldn't one mill a circle out and machine up an interference plug and save the box? It almost looks like it hasn't cracked between the bearings... yet. :mrgreen:

Click to expand...

About anything can be fixed with the right facilities.

A plug or a bolt on plate are both options that could work. Even a counterbore for a convex plug could save it, if time is cheap....

A plate is a dead easy machining job, easy to set up, easy to do.
Terry

Whatever you choose , new box or repair to it ... fit a roller bearing.

JB weld...!

OK, seriously, I also thought about a plate that actually held one or both bearings. Seems like a way to salvage a cracked box AND strengthen it to prevent future issues to me.

I wouldn't argue with Myford who says 'its easy to set up and do' ... nevertheless, its way beyond my capabilities ... !

Myford said:

A plate is a dead easy machining job, easy to set up, easy to do.
Terry

Click to expand...

I agree it wouldn't be difficult to make a plate or something but,,,,,,,,,,,,,,,,,,,,,, there will be a clearance problem with the sprocket/chain so anything used would have to be very thin.
Ride On
Dave