Sym MB10A7-A series Service Manual page 41

2. Maintenance Information
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Drive Chain Adjustment
Drive chain inspection
Place the bike on its main-stand with its
neutral gear.
Check the drive chain slack by moving the
chain up and down by fingers, and measure
the amount of chain slack.
Standard chain slack：10~20 mm
Caution
Because the front and rear sprocket has
different wearing situation, so please
rotate the rear wheel to find the minimum
chain slack for the measurement.
Drive chain adjustment
If you need to adjust the chain slack, please
loosen the rear axle nut and sleeve nut first.
Turn the left side and the right side adjusting
nut evenly to make the chain slack within the
standard range.
Caution
Turn the adjusting nuts of both sides
evenly to make the drive chain and
sprockets rotate smoothly.
Turn the nuts clockwise to tighten the chain,
or counterclockwise to loosen the chain
Tighten the sleeve nuts, then the rear axle
nut.
Torque value：4.0~5.0kgf-m
After tightening the rear axle nut, please
check the sleeve nuts to prevent them from
loosening.
Check the chain slack again, and make sure
the rear wheel rotates smoothly.
If the chain is too dirty, use high-flash point
solvents (Kerosene or Diesel) to clean the
chain.
Caution
Do not use gasoline when cleaning a the
chain. The gasoline will damage the
O-ring in the chain.
After cleaning, lubricate the chain with chain
lubricant.
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10~20 mm
Sleeve nut
Rear axle nut
Adjusting nut