Generic TR 125 Service Manual page 30

Please adjust chain as the following methods:
(1) Put up motorcycle with carriage
(2) Loosen the back axle nut1.
(3) Loosen the locking nut2
(4)Turn the adjustment bolt3 to right or left to adjust
the looseness of chain. When adjusting chain, make sure
front and back chain wheel should aim at centre as a line.
In order to help you adjust, there is reference mark on
swing arm and every chain adjuster. They can aim at each
other and become as the reference from out to out. After
aiming at and adjusting the looseness of chain to
10-20mm, fix back axle nuts again and then check as the
last time.
Attention:
When changing the new chain, the wear of the two
chain wheels should be checked. Replace them
when necessary.
Check the following situations of chain in periodic inspection.
(1) Loose pin
(2) Damaged idler wheel
(3) Dry out and rusting chain
(4) Twisting or seizing chain
(5) Excessive damage
(6) Adjust the loose chain
If chain is in the above conditions, chain wheel is likely to be damaged. Check the chain wheel as
following:
(1) Over wearing gear teeth
(2) Breaking off or damaged gear teeth
(3) Fix nuts with loose gear teeth
Lubrication of drive chain
Use drive chain grease first; buy drive chain grease or engine oil or other lubricating oil. Soak every chain
joint to make grease through link plate、melt、lining and rolling.
*Attention
Don't install new chain on the damaged chain wheel or install damaged chain on new chain wheel. Chain and
chain wheel should be in good condition, or the changed chain or chain wheel will be damaged soon.
Chain wheel
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Driving chains