Valve Clearance - Honda CRF150R 2020 Owner's Manual & Competition Handbook

Valve Clearance

Refer to Safety Precautions on page 19.
Excessive valve clearance will cause noise and
eventual engine damage. Little or no clearance will
prevent the valve from closing and cause valve
damage and power loss. Check the valve clearance
when the engine is cold at the intervals specified in
the Maintenance Schedule (page 21).
The checking or adjusting of the valve clearance
should be performed while the engine is cold.
The valve clearance will change as engine
temperature rises.
Cylinder Head Cover Removal
Before inspection, clean the engine thoroughly to
keep dirt from entering the engine.
1. Remove the seat and fuel tank (page 29, 30).
2. Remove the spark plug (page 52).
3. Disconnect the breather tube (1).
4. Remove the cylinder head cover bolts (2) and
cylinder head cover (3).
(2)
(1) breather tube
(2) cylinder head cover bolts
(3) cylinder head cover
5. Remove the spark plug hole packing.
Positioning At Top Dead Center On The
Compression Stroke
1. Remove the crankshaft hole cap (1).
(1)
(1) crankshaft hole cap
(3)
2. Remove the spark plug (page 52).

Valve Clearance

(1)
(cont'd)
53
Servicing Your Honda