chain tension

Polarity · Derestricted Danger Joined: 04 May 2004 Karma :

Just wondering if anyone can help, not sure how to adjust the chain tension on a honda nsr 125 rr. Any idea's would be a great help. Confused

Frost · World Chat Champion Joined: 26 May 2004 Karma :

Look at the swingarm where it meets the wheel, i would say there is a way of moving the rear wheel + sprocket back and forth to adjust the chain tension.

Unless the chain is slack all the way around i wouldnt bother adusting it.

alains · World Chat Champion Joined: 08 Jul 2004 Karma :

you must turn each side at the same level . control if it's not too thight after blocking the central bolt . if the picture is not good enough mail me i will give you a full one asaniard@neuf.fr
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The Tot · World Chat Champion Joined: 11 Jun 2004 Karma :

Your service manual should tell you how to do it, but other wise, here's a basic step. Like DaFrostyOne said, only bother doing it if your chain is totally slack:

1) Use a centrestand or paddock stand to make sure that the rear wheel is off the ground and the bike is balanced.

2) One side of you chain should feel tighter than the other as you try to push it up, rotate the rear wheel until the tight spot of the chain is at the bottom, i.e beneath the swingarm

3) Use a spanner to undo the rear spindle nut which connects the wheel rim/sprocket etc to the swing arm just enough to allow you access to the adjuster screws and bolts adjacent to the swingarm (it is running through the swingarm in a horizontal direction). As you undo the spindle nut, the swingarm should flex outwards like a bow and should return to a straight position once the nut is done up.

4) With a correct size spanner, slacken off the adjuster bolts taking particular caution NOT to ROUND them off... do not over-tighten. Do this on the side with the chain LAST!

5) Once you can see the slack being taken up (there's usually between 35mm - 45mm of free play in the chain where it can be pushed down at the midpoint of the bottom run of the chain)

6) Note the adjuster marks on the swingarm and do it on the otherside.

7) check the slack in the chain again and readjust if ammendments are required.

8) Retighten the spindle nut PREFERABLY using a torque wrench or some really jammy guesswork (not doing so will damage the thread of the nut and f**k you up basically)

9) It maybe necessary to redo the process again due to the swingarm bowing out as mentioned in step 3.

10) check that the wheels are running true and straight and you're off.

NB... best time to lube the chain before you ride..

hope this has been of help! Razz

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McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

mr jamez · World Chat Champion Joined: 04 Aug 2003 Karma :

This was posted not long ago, can't find the thread though.

Put the bike on the centre stand, loosen the rear wheel nut, adjust the nuts on the end of the swing arm equaly (you will see the wheel move as you tighten/slack the nuts) until there is 25-35mm of slack in the middle of the chain. Tighten the rear wheel nut to 65ftlb (pretty important) and give the chain a lube.