BRP-Rotax
REPAIR MANUAL
Figure 4.29: Combustion chamber insert
1
O-ring 23.3x2.4
2
O-ring 64x2
3
Cylinder head cover red
4 Allen screw M6x25
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INSPECTION AND ADJUSTMENT OF SQUISH GAP
General
NNOOTTEE
The gap between the piston (at the TDC of the piston) and the combustion cham-
ber insert (= “squish gap”) is partly responsible for the power characteristics of the
engine and responsible for smooth running.
NNOOTTEE
The smaller the squish gap the higher the engine compression. This means that
the engine response to the feed from the carburetor becomes more critical under
changing operating conditions (temperature, air pressure, humidity).
Special tools The following special tools and equipment are required:
Part no. Description Use
580130
Solder 2 mm Combustion chamber
580132
Solder 3 mm Combustion chamber
n.a.
Vernier caliper
Solder
Instructions See Figure: Squish gap measurement.
1. Rotate crankshaft by hand until the piston is approx. 5 mm below TDC.
Effectivity: 125 MAX evo, Junior MAX
evo, Mini MAX evo, Micro MAX evo
Edition - February 01 2018 /Rev. 0
Chapter 4
Page 31
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