Question about 2006 Yamaha XT 125 X

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When do i change the chain and sprockets

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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  • j m
    j m Dec 14, 2008

    Didn't understand what you mean't mate.

  • j m
    j m Dec 17, 2008

    Thanx mate, slip of the finger on previous rating

  • Anonymous Mar 29, 2014

    I have a 2012 Hyosung Gt 650i and it it is very jerky when you screw the throttle on and flops of when slowing there's no smooth acceleration it just snaps on I can't carry a pillion because it to snappy and I've only done 25000 kms and have had to replace chain and sprockets I've been riding for thirty years and have never had this experience before



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I found this to be some great instructions on chains and how they work and what to look for........hope this helps you out! Careful out there! Signed: fellow Rider...

Posted on Dec 14, 2008

  • Roscoe007 Dec 15, 2008

    Just so you know... Giving me a Inapproate rating is the worst thing you can give..I spent time looking for your chain guide to help you out ..why the bad rating?


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Change them if spocket is worn you'll only wear out engine and chain,you should get about 7000miles out of a set as long as you ride normally,if you ride like a nut then they'll wear out!!

Posted on Feb 17, 2009


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1 Answer

I'm gonna change my rear sprocket and front sprocket and chain how can I make sure it's gonna be done proper

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...

May 10, 2015 | Motorcycles

1 Answer

How many miles before i change my sprockets.

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.

Jan 07, 2015 | Motorcycles

1 Answer

I have a 05 honda cbr 600rr, im looking at changing the chain and sproket. what size and lenth and all that stuff do i need to get

1st. - NEVER change sprockets without changing the chain..and vice-versa!! - they need to be replaces as a set...they wear our almost equally.. ie - a worn out chain will wear out new sprockets... A new chain will get stretched out by worn sprockets real quick!
Its east to tell what you have...
  • OEM sprocket size: 16/43 - 2.68 ratio.
1. Count the teeth on your front sprocket.
2. Count the teeth on your rear sprocket.
Compare yours with stock(OEM)..
Now, if your sprockets match the stock sizes - count the number of links in your chain...(count the inner links).
If the sprockets are different sizes you adjust the chain by that number using inner links. - Usually people go smaller on the front or a larger rear.. this increases the ratio to give a quicker take-off - (more acceleration).
15/43 = 2.86
15/44 = 2.93
15/45 = 3.00
15/46 = 3.06
..when you get a new chain... better to get one a couple links too long than one link too short!!
Your local dealer will be more than helpful!!

Jul 28, 2012 | 2005 Honda CBR 600 RR

1 Answer

When do i change the rear sproket

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!

Mar 07, 2012 | 2009 Yamaha yBR125

1 Answer


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.

Oct 15, 2010 | Yamaha Ybr 125 Motorcycles

1 Answer

Yamaha r125

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.

Feb 15, 2010 | 2008 Yamaha YZF-R125

1 Answer

Yamaha r6 chain link and size?

1999 / 2003: chain 532 .... sprockets 16front 48rear ,.... 116 links

good practice to change sprockets with new chain...(dont forget to lubricate chain)

Oct 10, 2009 | 2001 Yamaha YZF-R6

2 Answers


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.

Nov 20, 2008 | 2005 Harley Davidson VRSCB V-Rod

1 Answer

Chain tight spot

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.,,,

Nov 10, 2008 | 2007 HM CRM F450RR I

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