VALVE CLEARANCE. Honda CBR125R

VALVE CLEARANCE

INSPECTION

• Inspect and adjust the valve clearance while the engine is cold (below 35°C/95°F).

• After the valve clearance inspection, check the

engine idle speed (page 5-62).

• Inspect and adjust the valve clearance can be serviced with the engine installed in the frame.

Remove the cylinder head cover (page 8-6).

Remove the timing hole cap and crankshaft hole cap.

TOOL:

Timing cap wrench 07709-0010001 or equivalent

TIMING HOLE CAP

MAINTENANCE

CRANKSHAFT HOLE CAP

Rotate the crankshaft counterclockwise and align the "T" mark on the flywheel with the index notch on the left crankcase cover.

INDEX NOTCH

"T" MARK

The index line on the cam sprocket must be flush with the cylinder head surface as shown.

Make sure the piston is at TDC (Top Dead Center) on the compression stroke.

This position can be obtained by confirming that there is slack in the rocker arm. If there is no slack, it is because the piston is moving through the exhaust stroke to TDC. Rotate the crankshaft one full turn and match up the "T" mark again.

INDEX LINE

ROCKER ARMS

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MAINTENANCE

Check the valve clearance by inserting a feeler gauge between the adjusting screw and valve stem.

VALVE CLEARANCE:

IN: 0.06

± 0.02 mm (0.002

± 0.001 in)

EX: 0.27

± 0.02 mm (0.011

± 0.001 in)

ADJUSTING SCREW

FEELER GAUGE

ADJUSTMENT

Adjust by loosening the lock nut and turning the adjusting screw until there is slight drag on the feeler gauge.

Apply engine oil to the lock nut threads and seating surface.

Hold the adjusting screw and tighten the lock nut to the specified torque.

TOOLS:

Valve adjusting wrench

Lock nut wrench

07708-0030300

07708-0030100

TORQUE: 10 N·m (1.0 kgf·m, 7 lbf·ft)

Recheck the valve clearances.

Install the cylinder head cover (page 8-7).

Apply engine oil to new O-rings and install them to each hole cap.

ADJUSTING WRENCH

LOCK NUT

FEELER GAUGE

O-RINGS

Install and tighten the timing hole cap and crankshaft hole cap to the specified torque.

TORQUE:

Timing hole cap:

6.0 N·m (0.6 kgf·m, 4.4 lbf·ft)

Crankshaft hole cap:

8.0 N·m (0.8 kgf·m, 5.9 lbf·ft)

TIMING HOLE CAP

CRANKSHAFT HOLE CAP

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