Beta Motorcycles X Trainer 300 2T 2015, Workshop Manual, Page: 88 / 117

3
86
M
O
TO
R C
H
EC
k
S AN
d
ASS
EM
B
LY
Extract the control valve pin if it has not come
away with one of the boosters.
Extract the valve pin by pushing it using a metal
cylinder A and then extract the valve, that is di-
vided into two pieces (right and left).
Check the bearings 4 supporting the booster
are efficient, without jams during functioning or
excessive play, once the unit has been cleaned
and descaled. On the contrary, replace.
Check pins 5 , 6 and relative seats are not abnor-
mally worn. On the contrary, replace the worn
parts.
Extraction of pin.
The exhaust valve unit.
Area A of the exhaust valve.
A
5
4
6
3.11.5 Exhaust valve unit
assembly
Insert the right and left exhaust valve in the ex-
haust pipe so part A is facing the upper part of
the cylinder and the fulcrum is facing the front
of the cylinder.
Insert the valve in the fulcrum.
A