Honda CR250R 2004 Owner's Manual page 29

4. SERVICE AND MAINTENANCE
Operating Inspection
NOTE:
•
Before inspection, clean the engine thoroughly to
keep dirt from entering the engine.
Warm up the engine to operating temperature.
Stop the engine, and remove the RC valve cover.
Connect the tachometer.
Start the engine and check that the RC valve pulley is in
the full close position.
Increase the engine speed until about 8,000 min
and check that the RC valve pulley turns to the full open
position.
1
(1) PULLEY
Disconnect the cables from the RC valve pulley.
Check that the exhaust valve turns smoothly.
If the exhaust valve does not turn smoothly, remove the
exhaust valve and decarbonize the flap valve and valve
shaft assembly (page 27).
1
(1) VALVE SHAFT ASSEMBLY
(2) FLAP VALVES (3) PULLEY
26
Exhaust valve Removal
Remove the RC valve cover bolts and wire clamp.
–1 (rpm)
(1) BOLTS
Remove the RC valve cover and gasket.
2
(1) RC VALVE COVER
3
(2) WIRE CLAMP
(2) GASKET
Loosen the lock nuts and disconnect the RC valve
control cables from the RC valve pulley.
Remove the cylinder (page 29).
(1) LOCK NUTS (2) CONTROL CABLES
Remove the socket bolt and stopper plate.
(1) SOCKET BOLT (2) STOPPER PLATE