SG250 Owner’s and Service Manual
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26
You should check the chain adjustment during your motorcycle’s first scheduled maintenance and at
every scheduled maintenance thereafter. The biggest adjustment will occur at the first service interval,
because chains do most of their stretching in their first several hundred miles of use. When the chain is
properly adjusted, it should have about 15mm (or 3/5 of an inch) slack at its midpoint.
If your chain requires adjustment, loosen the rear axle. The
rear axle is loosed by loosening the rear axle bolt and
nut. This photo shows the axle nut on the right side of the
SG250 motorcycle.
The left rear axle bolt head.
The rear axle adjustor nuts and locknuts are located behind
the adjustor plate on both sides of the swingarm. Loosen
both nuts on both sides of the swingarm.
The intent is to position and align the rear wheel such that the chain has 3/5 of an inch slack at its
midpoint. This is the amount of slack the chain should have with the motorcycle on the ground and
the rider on the bike. If the bike is on a lift such that the rear wheel is off the ground, you should
increase the amount of slack when you adjust the chain such that when you are on the bike, the slack is
3/5 of an inch. If the rear wheel must move forward to increase chain slack, back off on the adjustor
nuts and locknuts and manually push the rear wheel forward. If the rear wheel must move rearward to
decrease chain slack, tighten the inner nuts as required on both sides of the swingarm to move the axle
to the rear.
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