Hey guys,

Seems like a stretch I know but has anyone ever successfully prolonged the life or bodge-fixed a rear sprocket that is badly worn and about to become a smooth circle? Plenty of oil is the only thing I can think of so far...

Thoughts appreciated.

There are a few "bodges" to be done but best thing is to get NEW sprockets and chain ASAP. Also, keep in mind, your worn sprocket will have EATEN your chain and the front sprocket as well.

So, no point buying just a new rear sprocket, putting it onto a worn out chain and worn out front sprocket. Disaster in short order.

You need ALL NEW everything.
In future, you might consider keeping an eye on your sprockets and carrying some spares on board. One good tip is to change out your front sprocket about every 10,000 miles. I carry a spare front sprocket on all longer rides. Will extend chain life by about 20%.

The front sprocket is always the first to wear ... once worn will accelerate wear on both chain and rear sprocket. It's a system! and it's all quantifiable.

You may find a spare sprocket from a random bike of the correct pitch but the bolt holes won't line up. Try to RE-DRILL new holes in the sprocket to line up with those on your hubb. Can sometimes work.

Only other thing you can do ... and it's really a stupid thing ... is to tighten up chain (probably already done?) and oil the Hell out of it ... and ride on. Go easy, who knows, you might make it!

You could also have a machinist grind (by hand) out the sprocket, kind of reshape it so it will last a bit longer. Doesn't have to be perfect, just last enough until you can buy ALL NEW sprockets and chain.

The one time it happened to me that's exactly what I did - I think the chain was good for about c sharp eventually. But I only had to do about 50 miles so it was good enough and got me back.

If you really cant find a replacement sprocket, as a last resort you could get a workshop to add a thick bead of weld all around the outside edge and then grind out the shape, This is pretty tricky to do correctly, they have to make sure the new shape engages the chain correctly and make sure that whoever does it gets the diameter and number of teeth correct or it will change the gearing.


As Mollydog says, the rest of the chainset will be pretty screwed already, if you can order a new set and have it flown to you, this will be the best option - just watch out for customs fees for importing parts.

Good Luck!

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Cheers
Grif

'11 KTM 450 EXC
'09 Suzuki DR650
'00 Discovery Series 2 V8
'95 Defender 90 300 Tdi Overlander
http://gipperstravels.blogspot.ca

There is nothing to do but replace it.

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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.

Buy new chain sprockets as others have said.

Bodger fixes here won't last long, and if you have equipment then you have access to mail .. so get some new ones. The only thing that can be done is to tighten the chain.. if you make that too tight the chain will break, in any case it will give up soon.

Glad you got it sorted. A fix I've heard of, but never witnessed, is to get another sprocket with suitable teeth and then cut the centre out of it and weld in the centre of the original sprocket. If facilities are limited you might also get away with simply welding the new sprocket on the outside of the old one (assuming enough clearance) - chain alignment would not be great but I think it might work ok for awhile.

Sent from my SM-P350 using Tapatalk

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Martin

finally back on the road again


http://awayonmybike.blogspot.com/