Rotax 125 Micro MAX User Manual

DK00026.fm
REPAIR MANUAL
BRP-Powertrain
Effectivity: 125 MAX/125 Junior MAX/125 Mini
MAX/125 Micro MAX
Edition 2 / Rev. 0
Chapter 4
Page 16
December 01/2010
Piston and
cylinder sizing
NOTES: A new piston has the size classification stamped on the
piston skirt.
NOTES: On new cylinders the size classification (A, AB, B) is
stamped on the top.
Measuring the cylinder diameter:
Piston and cylinder classification
Piston pin,
piston pin circlip
See Figure 9.
Figure 9 K00008
Step Procedure
1 Now measure the cylinder diameter 10 mm below the upper edge of the cyl-
inder. This dimension dictates the selection of the matching piston. If the di-
mension has reached the wear limit of 54.045 mm, the cylinder must be
replaced.
Marking, cylinder Cylinder dimension
Marking,
piston
Piston dimension
Cylinder
dimension A
54.000 - 54.010 mm 53.97 mm 53.965 - 53.975 mm
(standard)
Cylinder
dimension AB
54.010 - 54.015 mm 53.98 mm 53.975 - 53.985 mm
(standard)
Cylinder
dimension B
54.015 - 54.025 mm 53.99 mm 53.985 - 53.995 mm
Step Procedure
1 Inspect the piston pin (1) for wear and discoloration.
2 Check the needle cage (2) for cracks and abrasion.
3 The circlips (3) are replaced at every repair.
Part Function
1 Piston pin
2 Needle cage
3 Circlip
3
1
3
2

Rotax 125 Micro MAX Specifications

General

Brand	Rotax
Model	125 Micro MAX
Category	Engine
Language	English