My '05' yamaha xt125x has done 2500 miles since new and i'm not sure when to change the sprocket and chain. i've been told that the teeth are worn but i've only had the bike for 2months. i'm wondering how long can i ride in that condition.
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Hi Jake if you have the right tools it will be no trouble. Before you remove the rear wheel remove the front sprocket cover and loosen the nut or nuts holding the front sprocket. This will be safer than doing it with the r/wheel off. Next remove the wheel and keep note as to where the spacers go (don't mix them up!) remove the sprocket nuts and the sprocket. Again note which way the sprocket goes some have a thinner center so make sure the new one fits the same way. Refit the wheel leave it loose and loosen the adjusters allowing the wheel all the way forward. Then open the chain and join the new chain to the end of the old one with the link supplied then pull the old chain until the new one is fitted. Next join the new chain together. ( you may need to remove a link or two) it will depend on the length of the new chain. After this fit the new f/sprocket and tighten the nut then adjust the chain leaving 1.5inches of free play up and down. Make sure the adjusters sre even on the marks each side. And finaly After a day or two of use adjust again to around 1 inch up and down. Have fun. Regards Jim...
Mileage is not the determining factor in changing sprockets as much as wear is. As a sprocket wears, they will lose their original shape of having a small flat tip of the tooth. A worn out sprocket is very sharp and pointed. Continued operation will actually start to bend the point over. A well lubed and tensioned chain will give you many miles of minimal wear. A dry and loose chain will wreck a new sprocket in a very short time.
When your chain is worn the sprockets share the damage. If your chain was razor sharp or wearing unevenly: it's time to change : front sprocket (****** side) rear sprocket and use the proper size chain to match. They sell them in sets. It's quite possible only your chain may need to be changed . Inspect the sprockets! If you haven't done so, purchase a repair book for your bike and carry it with you. The information is found on page.... Good Luck, hope this helps!
The chain is not a huge issue, but the sprockets are. When a chain wears, the sprockets suffer the same about of wear. If you just change the chain, the new one will have seriously shortened life as it wants to wear out to the level of the old sprockets.
This is not a do it yourself job, specifically the front sprocket.
Just remove the chain cover then bend the tab on the lockwasher away from the nut so you can then remove the nut. Install the new sprocket and put the assembly back together. Stock gearing is a 13 tooth front sprocket and 48 tooth rear sprocket. The stock chain is 112 links plus master link. The chain is DID 520D 112L. Please rate my answer. Thanks.
probably, alot of these sprockets are almost the same size so often when they are checking for compatability, they often mistake since they are close. If you bought it from a dealer, take it back with your old one and make them put a caliper on it to measure it properly.
Yes. It’s likely that the sprockets are worn. Putting a new chain non a worn pair of sprockets will make the chain wear out faster—and replacing the sprockets without replacing the chain will sear out the sprockets. Do them as a set.
BUT adjusted like that there's a tight spot with 0mm. The green new chain required gauge on swinging arm tells me there's plenty of life left in the O ring chain. I've done approx 7K miles and chain wasn't new when I got the bike about 15 months ago. The sprockets are not BADLY worn. I fitted a Scottoiler 7 or 8 hundred miles ago..........Do you folks think I need a new chain and sprockets? This tight spot has only very recently become evident - don't think I've damaged the chain but maybe I have. Think I'm talking myself into new chain here!..............Anyone got advice about cheap/good value UK suppliers? Could do the job myself I thinkIf the tight spot is bad enough you will need to replace. And you MUST do it as a set...chain and sprockets. It is a waste of money to just replace the chain because the worn sprockets will wear it out in no time.
And do not cheap out on the chain. Make sure you get a good quality O or X- Ring chain.
I know the popular thing to do with sprockets is to get Aluminum to save weight, but I'd get the steel. It may weigh more but it will last twice as long.
Just re-read, if it is adjusted to spec and the tight spot has no freeplay, yeah, time to replace.,,,