Question about 2003 Yamaha YZ 250

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How do i tighten the chain on 2002 yz250? - 2003 Yamaha YZ 250

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  • Master
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  • Loosen off the axle nut (B) until it is only lightly tightened. Wind out the chain adjuster bolts (C) evenly on both sides until you reach the desired tension. You will see the top of the chain rise as you wind out the adjuster bolts.on pic below

Once you reach the correct tension, make sure both sides are evenly spaced (using the marker grooves on the adjuster blocks). Squeeze the chain against the swingarm with your hand to hold everything in place and tighten up the axle nut.Tighten up the chain adjuster lock nuts. Now you're ready to ride!
  • Tighten up the chain adjuster lock nuts and thats it buddy measure the chain on the swing anr amr it should be 45mm slack on the swing and arm where the chain slider is how do i tighten the chain on 2002 yz250? - 54159bf.jpg

Posted on Oct 03, 2009

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Your going to need a 10mm and a 12mm open or box wrench. loosen the 12mm bolt first, you may need to sray it with the best bolt buster you got and let sit for a while. DON'T try manhandling it cause it will brake. take the 10mm wrench and try loosening the bolt. When loosened use a caliber to measure the right and left side or buy tool for alinement

Posted on Oct 04, 2009

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  • Yamaha Master
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You can do it with the bike on the floor or stand. Loosen the large rear axle nut, don't have to remove it. Loosen left and right jamb nuts for the bolts just in front of the rear axle. Back out the bolts (Evenly) as this will move the rear wheel back to tighten the chain. You should have around an 1 1/2" up and down movement in the center of the chain between the front and rear sprockets. Adjust it as not too tight or loose. Tighten the jamb nuts, and while pusshing the rear wheel forward, tighten the axle nut. Re-check the chain tention.
(you can check if the wheel is even by measuring from the swing arm bolt to the axle. This should be even on both sides.)

Posted on Oct 03, 2009

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  • Expert
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I think the manual says about 1-3/4" or about 43 to 46mm from the chain guide to the chain on top the swingarm while on centerstand

i prefer to compress the rear suspension to it's longest point (chain at its tightest) and check for 3/4" play in the bottom of the chain in the center of the sprockets

Posted on Oct 03, 2009

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