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The combustion chambers are modified by cutting work but the edges shown must be
hand finished for smooth corners (Round them to about R1).
Chamfer the machining edge of the cylinder head where the valve seat is installed, also
smooth the dome of the combustion chamber with the valves installed. Excessive
smoothing may reduce the cylinder compression.
XXX. Edges
NOTE
When grinding the cylinder head bottom surface or using thinner gaskets, adjust the
valve timing to keep that the valve to piston clearance is not less than the minimum
value (IN: 0.8 mm, EX: 1.4 mm).
Camshaft Chain Tensioner
Replace the cam chain tensioner with the kit to gain the durability.
Apply the engine oil to the tensioner rod, O-ring and tensioner body, insert them into the
tensioner body.
Check to see that the tensioner rod turns freely in the body, if not, polish the tensioner rod
or fine the female threads in the body with a tap (Diameter × Pitch = 6 mm × 1.0 mm).
Install the tensioner on the cylinder block with the tensioner rod is fully pushed back.
Turn the tensioner rod in with a screwdriver until it becomes hard to turn.
Turn the crankshaft clockwise forcing lightly to the tensioner rod with twisting force to
take up any gap and tighten the locknut.
Tighten the rock nut after adjustment.
NOTE
Never forward the tensioner rod forcibly, this will increase mechanical loss of the
tensioner and may damage to the chain guide.
The cam chain tensioner must be adjusted at every race.
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