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Belt running off front pulley
https://ukbeg.com/forum/viewtopic.php?f=8&t=17924		 Page 1 of 1
Author:  Doogy [ 04 Nov 2013 10:08 ]
Post subject:  Belt running off front pulley
New Drive Belt is not aligning correctly and is moving inboard against the engine case when you rotate the wheel forward. I have just replaced the belt on the M2 by lifting the frame up off the engine etc. and replaced the rear isolators. I thought I may have misaligned the engine and frame. But the belt must have been touching the engine case previously because there is wear on the engine case already.
could it be something else, like swingarm bearings? I couldn't feel any play. The belt lasted 23,500 miles.
Any thoughts would be very welcome.
Doug
Author:  pash [ 04 Nov 2013 12:28 ]
Post subject:  Re: Belt running off front pulley
Is the rear wheel aligned?

The isolators will not have an effect as the swinging arm is bolted to the engine, the isolators will change the alignment if the frame only.

The belt will run one way or the other depending on which direction the rear wheel is rotated...
Author:  Doogy [ 04 Nov 2013 21:13 ]
Post subject:  Re: Belt running off front pulley
Thanks Pash.
The belt does run towards the engine case when the bike is moved forward.
So the belt will never run exactly in the centre of the pulleys, even when I have aligned the wheels?
Author:  pash [ 04 Nov 2013 21:31 ]
Post subject:  Re: Belt running off front pulley
Yeah if you do it perfectly.

What happens if you roll the bike backwards?
Author:  forsythem [ 04 Nov 2013 22:23 ]
Post subject:  Re: Belt running off front pulley
I had the same issue when I put the last belt on the M2.

I had significant wear on the front pulley, and where the belt sits has worn a deeper groove, so there was a sharp lip on the inside of the pulley as well, which didn't stop the belt from going over it, but stopped it from going back.

After advice that it would sort itself out over time, I watched it not sort itself out for a few days, while starting to chew the gearbox-side of the belt out.

I ended up bending a very simple metal guide, that I bolted to the gearbox/swingarm bolting point, which just "encouraged" the belt to stay in the correct place until it had settled down. Took less than a week for the belt to get into the right place, and it being kept in place by a bit of smooth alloy didn't do any damage at all to the belt, as opposed to letting it run on the side of the gearbox.

Left the thing on from then afterwards, and it went with the bike. Genuine Fowlerware alloy (from a toilet cistern...)

Attachment:
File comment: Fowlerware M2 Belt Guide
IMGP5094 Fowlerware Resized.jpg
IMGP5094 Fowlerware Resized.jpg [ 1.27 MiB | Viewed 866 times ]
Author:  Doogy [ 05 Nov 2013 09:57 ]
Post subject:  Re: Belt running off front pulley
When the bike is rolled backwards the belt tracks to the outer edge of the front pulley.
There is a slight lip on the inside edge of the pulley.
Thanks for the idea on the belt guide that's going to be my plan 'B'.
Cheers
Doug
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