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Fozzo717

Sprocket & Chain question

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I have an 02 yz 426 with the original chain and sprockets. They look fine to me but a mechanic told me my chain is streched and if I am going to replace the chain I might as well replace sprockets too. What should I look at or for to confirm what he is saying? If I do need a new set up what do you guys recomend? Thanks in advance!

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chains do stretch and if you have any sort of caliper that would be a good place to start. i got through a chain and rear sprocket every couple amonths during season in the summer only 1. thats why i switched to an msr iron man not that heavy for a moly one and looks sick and lasts.

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I have an 02 yz 426 with the original chain and sprockets. They look fine to me but a mechanic told me my chain is streched and if I am going to replace the chain I might as well replace sprockets too. What should I look at or for to confirm what he is saying? If I do need a new set up what do you guys recomend? Thanks in advance!

First of all congrats on having chain and sprockets last for 7 years,especially on a big bore thumper.

the rear sprocket is the easiest to tell if it is worn,they will look somewhat hooked or like a shark fin.

A simple test is to grab the chain at the back of the rear sprocket and pull it away from the sprocket.

If the chain is stretched and the teeth worn it will show more than half of the tooth on the sprocket.Replacement time.A brand new chain on a new sprocket will move too but it will barely show 1/4 of a tooth.

Most people only want to replace worn sprockets and keep the chain,but chains do stretch and that worn chain on new sprockets just shortened the lifespan of those new sprockets.

You should be able to get the whole package for anywhere from $85 to $150, not saying you can't spend more.

I have found chain and sprockets on ebay for my 250 F for less than $70.

If long life is important to you and weight isn't an issue go with steel sprockets.

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Look at the sprocket teeth, are they even on both sides. My guess is they will be hooked on the drive side and if hooked, they are worn. Chain stretch is more a function of the conditions you ride in and the care you take with your chain. The type of chain can also be a factor.

Also look in your manual, it does show how to check chain stretch and sprocket wear.

Assuming you decide to replace your chain, I recommend you also replace your sprockets.

On my YZ400 and CR250 I run an o-ring chain which I find stretches way less than a conventional chain. I get around 9 months from my chains and have nornally replaced the sprockets at the same time. I am about to switch to steel sprockets on my next change as they are cheaper and will probably wear less.

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