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CHAPTER 3 ENGINE
3.3.2 Procedures of Maintenance & Adjustment
This section describes the maintenance procedures for
each item mentioned in the Periodic Maintenance Chart.
3.3.2.1 VALVE CLEARANCE
Inspect initially at 20-hour break-in and every 40 hours
or every 1000km thereafter. Inspect the clearance after
removing cylinder head.
Excessive valve clearance results in valve noise and
insufficient valve clearance results in valve damage and
reduced power.
Check the valve clearance at the period indicated above
and adjust the valve clearance to specification, if
necessary.
Remove cover ①
Remove inspection cap ②on left crankcase.
Remove 2 valve adjusting cover ③
Turn the crankshaft until the line④ of T.D.C. on rotor is
aligned with mark⑤ of inspection hole on left
crankcase.
Insert feeler gauge to check the clearance between
the valve stem end and the adjust bolt on the rocker
arm.
Valve Clearance (When cold)
IN: 0.05-0.10mm EX: 0.15-0.20mm
Note:
The valve clearance must be adjusted when the
engine is cold.
Adjust the valve clearance when the piston is at the
Top Dead Center (T.D.C.) on the compression stroke.
If the clearance is incorrect, bring it into the specified range
using the special tool.
Loosen valve adjust bolt and nut, insert a feeler gauge
between the valve stem end and valve adjusting bolt,
tighten valve adjust bolt, make sure it slightly contacts the
feeler gauge, tighten bolt and nut.
T-Boss550 SERVICE MANUAL20.0
CHAPTER 3 ENGINE
PAGE. 3- 24
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