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Cylinder Head
Grind off the stepped portions of the ports and smooth the inside of ports to make
intake/exhaust gas flow more smooth.
Grind off the stepped portion only at the mating surface between the carburetor holder
and the intake port. Do not port it. To extend the intake port, air flow speed will be
reduced and the engine performance at the high speed range may be down.
Mark the carburetor holders so that they can be installed in their original positions.
Grind off and smooth the stepped portions at the mating surface between valve seat and
the port.
Smooth the inside of the intake port and exhaust port.
Use the hand grinder.
Use #200 oil stone for eliminating any stepped portions.
Use #200 oil stone for smoothing and #300 oil stone for finishing.
NOTE
These procedures make air resistance less and intake/exhaust gas flow more smooth.
However, much more effect can not be expected by excessive grinding and smoothing.
It may be done to the extent of getting rid of uneven surfaces.
1. Stepped Portions of carburetor holder and cylinder head.
2. Stepped Portions of valve seat and cylinder head.
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