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6. Cylinder Head / Valve

6-16

Valve Clearance Adjustment

Loosen Air Injection system (AI) pipe upper side

bolt (2 bolts).

Remove cylinder head cover.

Remove the cylinder head side cover.

Remove left crankcase cover, and turn the drive

face, and align the timing mark on the cam

sprocket with that of cylinder head, piston is at

TDC position.

Loosen valve clearance adjustment nuts and bolts

located on valve rocker arm.

Measure and adjust valve clearance with feeler

gauge.

After valve clearance had been adjusted to

standard value, hold adjustment bolt and then

tighten the Adjustment nut.

Standard Value: IN 0.10 ± 0.02 mm

EX 0.15 ± 0.02 mm

Install the cylinder head side cover.

Start the engine and make sure that engine oil

flows onto the cylinder head.

Stop the engine after confirmed, and then install

the cylinder head cover and AI pipe.

Caution

 If lubricant does not flow to cylinder head,

engine components will be worn out seriously.

Thus, it must be confirmed.

 When checking lubricant flowing condition, run

the engine in idle speed. Do not accelerate

engine speed.

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4 bolts

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Sym MAXSYM 400i Specifications

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