Thread: chain tension
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Old 04-09-2013, 04:00 PM
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2door 2door is offline
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Default Re: chain tension

Chain tension and alignment are critical. The engine drive sprocket and the rear wheel driven sprocket MUST be exactly aligned or you will have chain derailment issues.

Also the rear sprocket MUST be precisely centered on the rear hub and have no lateral wobbles. It must spin true as viewed from the side and the top. If the sprocket wobbles in either plane you'll have chain problems.

The tensioner wheel also must align with the chain path. If it isn't it will pull the chain to one side and cause derailment. Almost without exception the tensioner bracket will need to be bent/twisted slightly to achieve wheel to chain alignment.
Chain tension should be 1/2 to 3/4". This is measured by rolling the bike forward, clutch engaged, until the piston comes up against compression. At that time the top chain run will go slack. That's where you measure the tension/slack. 1/2 to 3/4" of slack.

A chain that is too tight will run rough and is just as prone to derailing as one that is too loose especially if the sprocket alignment isn't perfect.

Age and Treachery Will Always Triumph
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Last edited by 2door; 04-09-2013 at 04:03 PM.
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