5-16
Power Unit
4st 9.9/15/20 2008
Perform adjustment of valve clearances when
engine is cold.
1. Remove upper starter lock cable, and then recoil starter and
belt cover.
2. Remove fuel pump 1.
3. Disconnect plug cap connection, and then, remove spark
plug and cylinder head cover 2.
3) Inspection of Valve Clearance
No.1 piston is to be at top dead center of
compression stroke.
5. Check and adjust No. 1 cylinder's intake and exhaust valve
clearances. Adjust gap if it is out of specified range.
6. Loosen rocker arm lock nut 5, and turn adjusting screw 6
so that valve clearances are within the specified range.
· Turning adjust screw 6 clockwise makes
valve clearance smaller.
· Turning adjust screw 6 counterclockwise
makes valve clearance larger.
Valve clearance driver 8 :
P/N. 3AC-99071-0
Torque wrench 9 :
P/N. 3AC-99070-0
Thickness gauge 0 :
Use commercially available item.
Valve Clearance (when engine is cold)
(IN) Intake valve : 0.13 - 0.17 mm (0.0051 - 0.0067 in)
(EX) Exhaust valve : 0.18 - 0.22 mm (0.0071 - 0.0087 in)
When removing or installing cylinder head
cover, use 10mm ring wrench with large offset
angle.
4. Rotate flywheel 3 clockwise to bring "●1" mark a of cam
shaft pulley 4 to "▲" mark b of cylinder head.
E_MFS20C_ch05_090105.qxd 09.1.20 5:25 PM ページ 16
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