Valve clearance – HONDA CT110 User Manual
Page 7
otherwise use a wire brush.
4. Check the spark plug gap (1) using a wire type feeler gauge. If adjustment is necessary, bend
the side electrode (2) carefully.
The gap should be :
0.6 - 0.7 mm ( 0.024 - 0.028 in )
Make sure the plug washer is in good condition.
5. With the plug washer attached, thread the spark plug in by hand to prevent cross threading.
6. Tighten a new spark plug 1/2 turn with a spark plug wrench to compress the washer. If you are
reusing a plug, it should only take 1/8 - 1/4 turn after the plug seat.
7. Reinstall the spark plug cap.
CAUTION
•
The spark plug must be securely tightened. An improperly tightened plug
can become very hot and possibly damage the engine.
•
Never use a spark plug with an improper heat range. Sever engine
damage could result.
VALVE CLEARANCE
( Refer
Excessive valve clearance will cause noise, and little or no clearance will prevent the valve from closing
and cause valve damage and power loss. Check valve clearance at the specified intervals.
CAUTION Checking or adjusting of valve clearance should be performed while the engine
is cold. The clearance will change as the engine temperature rises.
1. Remove the crankshaft hole cap and timing mark hole cap.
2. Remove the valve adjuster covers.
3. Rotate the crankshaft counterclockwise and align the T mark (1) with the index mark (2). Make
sure the piston is at the top of the compression stroke by jiggling the rocker arms with your
fingers. If they are free, the piston is at the top of the compression stroke. If they are tight,
rotate the crankshaft 360‹ and re-align the marks.
4. Check the clearance by inserting the feeler gauge (3) between the valve adjusting screw (4) and
valve stem.
NOTE
When checking the clearance, slide the feeler gauge from the inside out.
Standard clearance:
•
In. 0.05 mm ( 0.002 in )
•
Ex. 0.05 mm ( 0.002 in )
Adjust by loosening the lock nut (5) and turning the adjusting screw (4)
until there is a slight drag on the feeler gauge. After tightening the lock nut