Montesa COTA 301RR 2023, Owner'S Manual

Page: 83 / 180

Engine servicing
4-20 4-20
(1) “T” MARK
(2) INDEX MARK
Remove the fuel tank/injector.
Remove the timing hole cap and O-ring from the left
crankcase cover.
Turn the crankshaft by operating the kickstarter and align
the “T” mark on the flywheel with the index mark on the
left crankcase cover.
(1) TIMING HOLE CAP
(1) CAM CHAIN TENSIONER LIFTER
Cylinder Head Cover/Camshaft Removal
Remove the cam chain tensioner lifter sealing bolt and
sealing washer.
Turn the tensioner lifter clockwise fully and secure it with
the stopper tool.
This tool can be easily be made from a thin (1 mm thick)
piece of steel as shown.
(1) SEALING BOLT/WASHER
(2) STOPPER TOOL
(1) CYLINDER COMPRESSION GAUGE
Cylinder Compression
Warm up the engine to normal operating temperature.
Stop the engine and remove the spark plug.
Install a compression gauge.
Shift the transmission into neutral.
Open the throttle all the way and crank the engine with
the kickstarter until the gauge reading stops rising.
Compression pressure:
1,300 kPa (13.3 kgf/cm
2
, 189 psi)
Low compression can be caused by:
– Blown cylinder head gasket
– Improper valve adjustment
– Valve leakage
– Worn piston ring or cylinder
High compression can be caused by:
– Incorrect valves adjustment
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