Lynn wrote:...lay out the port timing with a magic marker on the
housing as you turn it over. At least you can see if it's possible.

Bob Earley wrote:

Lynn, Could you explain how to do this? Thanks.

Bob

Assemble the front of an engine through the first housing. Start with a rotor face at top dead center. (Facing the spark plug holes). Turn the crank counterclockwise (because you are looking into the engine from the rear) until the apex seal at the botom of the rotor just starts to uncover the exhaust port.
Make a mark on the edge of the housing where the apex seal touches the housing. Keep turning until the apex seal has traversed the exhaust port and is back on solid iron again (just closed). Make another mark on the housing adjacent to the apex seal. Turn the crank until this same apex seal is close to the intake port area. Turn the crank until the side of the rotor just starts to uncover the intake port. Make a mark on the housing adjacent the the apex seal. Turn the crank exposing the intake port and keep turning until the rotor just completely covers the port (closed). Make a mark on the housing adjacent to the apex seal. Remove the housing and using a small square, draw a line across the housing face at the marks made as above. If you enlarge the exhaust port, but do not grind outside the lines you just made, the port timing will remain stock. If you drill through the housing and grind out a nice big square intake port, but stay between the lines as above, you will have !

st!

ock intake port timing.
Lynn E Hanover

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