Honda CRF250R 2018 Owner's Manual page 74

Positioning At TDC On The
Compression Stroke
1. Remove the timing hole cap (1) and crankshaft
hole cap (2).
(1)
(1) timing hole cap (2) crankshaft hole cap
2. Remove the spark plug (page 67).
3. Remove the cylinder head cover (page 68).
4. Rotate the crankshaft by turning the flywheel
(3) counterclockwise until the matching mark
(4) on the flywheel aligns with the index mark
(5) on the left crankcase cover. In this position,
the piston may either be on the compression or
exhaust stroke at TDC.
If the crankshaft passed the matching mark,
rotate the flywheel counterclockwise again and
align the matching mark with the index mark.
(5) (4)
(3) flywheel
(4) matching mark
5. Make sure that the decompressor weight (6) is
in the lower position.
(2)
Check the timing marks (7) on each cam
sprocket are aligned with the cylinder head
mating surface (8).
(7)
Align
(8)
(6) decompressor weight
(7) timing marks
(8) cylinder head mating surface
(3)
1. Set the piston at TDC on the compression
2. Measure the valve clearances of each intake
Be careful not to damage the intake rocker arms.
(5) index mark
(7)
Align Align
(6) (8)
(1) feeler gauge
(2) intake rocker arms
Valve Clearance
Valve Clearance Inspection
stroke (this page).
valve by inserting a feeler gauge (1) between
the intake rocker arms (2) slipper surface and
camshaft cam lobes (3).
NOTICE
(1)
(2)
(2)
(3) camshaft cam lobes
Valve Clearance:
IN: 0.004 ± 0.001 in (0.11 ± 0.03 mm)
Servicing Your Honda
(3)
(3)
(1)
(cont'd)
69