•
Put the piston ring in the cylinder and measure the
space with an air gap tool. The space must not be
more than 1 mm.
7.9.5.1 To examine the piston pin
•
Make sure that the piston pin bearing is not
damaged.
•
Make sure that the piston pin does not have
discolorations.
•
Make sure that the piston pin does not have
damages on the surface against the bearing.
•
If the piston moves too easily, replace the piston and
the piston pin.
•
Make sure that the needle bearing does not have
discolorations or damages.
7.9.6 To assemble the cylinder and piston
1. Carefully put the piston ring on the piston. Make
sure that you do not cause damage to the piston ring
or the piston.
2. Lubricate the needle bearing with two-stroke oil and
put it into the connecting rod. Make sure the needle
bearing moves freely in the connecting rod.
3. Attach the piston to the connecting rod. Point the
arrow at the piston top in the direction of the exhaust
port.
Note: Put a cloth in the crankcase opening to make
sure that the piston rings do not fall into the
crankcase. Make sure that the piston rings are
correctly attached in the grooves.
4. Push in the piston pin.
32 - Repair instructions
1281 - 001 -
Summary of Contents for 331RB
Page 1: ...Workshop manual 331RB English 1281 001 ...
Page 47: ...1281 001 Technical data 47 ...
Page 48: ...1141483 26 2019 09 27 ...
