Drive Chain Slack
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Check the amount of chain slack by moving the vehicle slightly forward to gain slack at the top side of the chain.
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Collapse the suspension with an adjustable (buckle type) trailer tiedown strap. Fasten the strap around the axle and rear bumper tube.
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Tighten the strap until a straight line can be drawn from the rear axle to the gearcase output shaft intersecting the swing arm pivot. This establishes the tightest chain position.
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Pull down on the chain tensioner 1 to move it out of the way, then measure chain slack. It should have 1/4"-1/2" (6-12 mm) deflection.
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If the chain needs adjustment, use the procedure cited below.