PO-15 Compression Relief

[Buccaneer]

I thought the compression relief system consisted only of the poppet
valve in the one cylinder head, but now I see there’s also a
rotary curved vane in the inlet porting. Does this shut off
fuel to the cylinder so flames don’t shoot out the poppet valve?

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Prepare to be boarded!

[George Emmanuel]

Nope, it prevents a charge of fuel/air from entering the cylinder and allows the mixture concentrated in the crankcase to go to the other cylinder.

As an FYI, you can start that engine without using the compression release, but I like using it, especially when the engine is cold. I’ll crank mine up and idle a bit before closing the valve. That seems to prevent a stall when getting away from the dock.

George

[Buccaneer]

Strange set-up starting a two cylinder up on one cylinder!
Guess you better make sure your best spark plug is always
on the starboard side!

Prepare to be boarded!

[garry-in-michigan]

Some early models shorted the unused spark plug as well, thus doubling the power to the working spark plug. That made it the easiest starting (and heaviest) ten horse single in existence at the time. . . 😆

[Author]

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