chaining chain and sprockets

[el_oso]

the front sprocket on my thundercat is in my opinion well worn. the back sprocket looks fine and the chain also looks fine and is still only on the beginning notches on the swingarm. both the back sprocket and chain are around 3.5k/4k miles old. no idea how old the front is. would you replace the lot or just the front. As the front sprocket is only cheap I would just replace the front and then when the chain and back are worn replace the lot together. The main thing that I am slightly worried about is that the front seems well worn compared to the back. i realise it will wear quicker as it's smaller but is there anything that will cause it to wear quicker. it may be that the last owner didn't chain it when he changed the back sprocket and chain but that just seems a little strange to me.
I oil my chain regularly, usually every other time I fill up or every couple of weeks depending on use. therefore I don't think that will be a problem.
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Duke 390
Previous: '05 XR125L | '96 XJ600S Diversion |'05 Suzuki GSXR1000 | '05 Honda CBR125-R | '97 YZF 600R Thundercat | '11 Honda CBR250
Car: Jeep Wrangler 4.0L

[Crazyd943]

You should always replace front, back, and chain as a lot. Otherwise it can cause further wearing to the ones you didn't replace. (Apparently...)

[Walloper]

You must do front, rear sprockets and chain all at the same time.

To do otherwise will promote wear in the new part and you will end up chasing your arse/tail.
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W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair

[Taught2BCauti...]

Sounds like someone changed the chain and rear sprocket, but forgot to do the front sprocket.

Shouldn't cause too many problems if you change the front sprocket now, and just keep an eye on the chain and rear sprocket until it settles-in.

Next time, change all three of them at the same time.
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Honda Varadero XL125(V8)
www.TheFutureIsHere.eu

[Kickstart]

Hi

While it is best to replace a full set at once (as said, the new bits will rapidly wear to match the old bits), if the expensive chain and the rear sprocket are OK while the cheap front sprocket is worn out if you put on a new front sprocket all you will do is land up with the cheap front wearing a bit more quickly for a while.

So in your situation, being a tight git I would just swap the front sprocket. But double check the chain (make sure nobody has taken a couple of links out of the chain to disguise the wear).

Fronts being smaller suffer more wear, but to compensate are usually made from far harder steel.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Walloper]