Beta RR 4T-400 Workshop Manual page 49

Chain maintenance
The life of the chain mainly depends on its maintenance. Chain without X-rings should be regularly cleaned in petroleum
and then immersed in hot chain oil or treated with chain spray.
The maintenance of X-ring chains is reduced to a minimum. The best way to clean them is to use plenty of water. Never
attempt to clean an X-ring chain with brushes or solvents. Once the chain has dried, it is possible to use a spray for X-
ring chains.
Take special care in ensuring that the lubricant does not come into contact with the rear tyre or the brake disc, oth-
erwise the grip of the tyre or the braking action would be considerably reduced, making the vehicle difficult to con-
trol.
Chain wear
Carefully follow the procedure described below to check the
wear of the chain.
Change into neutral, pull up the upper chain stretch with a force
of 10-15 kg (see figure). Now measure the length of 18 links on
the lower chain stretch. If the measurement is equal to or
greater than 272 mm, replace the chain. Chains do not always
wear out evenly. For this reason the measurement should be
taken at different points along the chain.
When fitting a new chain, it is advisable to change the
front and rear sprockets as well. New chains wear out
faster when fitted on old and worn-out front sprockets.
In case of replacement, adjust the chain tension.
Chain tensioning
To prolong the life of the drive chain, it is advisable to periodi-
cally check its tensioning.
Always keep the chain clean and lubricated. Whenever the
chain play exceeds 30 ÷ 35 mm, adjust the chain tension by fol-
lowing these steps:
– Loosen wheel spindle nut 1.
– Loosen counternuts A on both fork arms.
– Turn adjusting screw B on either side to obtain the desired
tension.
– Tighten counternuts A on both fork arms.
– Tighten nut 1.
4 - Maintenance
Release 01 Date 09/2007
10-15 Kg
18 steps
OK < 272
30 ÷ 35 mm
A
B
1 B
A
19