Montesa COTA 4RT 260 2023, Owner'S Manual

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Engine servicing
4-22 4-22
(1) ROCKER ARM
(2) ROCKER ARM SHAFT
(1) DECOMPRESSOR
(2) RETURN SPRING
Inspection
Remove the bearings from the camshaft.
Turn the inner race of each bearing with your finger.
The bearing should turn smoothly and quietly.
Replace the bearing if the bearing do not turn smoothly
and quietly.
Check the decompressor cam for wear or damage.
If any components are faulty, replace the camshaft
assembly.
(1) BEARINGS
(2) CAMSHAFT
(1) INTAKE ROCKER ARM SHAFT
(2) EXHAUST ROCKER ARM SHAFT
(3) INTAKE ROCKER ARM
(4) EXHAUST ROCKER ARM
Disassembly
Pull out the rocker arm shafts using a suitable 6 mm bolt
and remove the intake and exhaust rocker arms.
Check the rocker arms and shafts for wear or damage.
Measure the rocker arm I.D.
Service limit: 10.051 mm (0.3957 in)
Measure the rocker arm shaft O.D. at rocker arm sliding
portion.
Service limit: 9.925 mm (0.3907 in)
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