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May 07, 2016, 03:51 PM
Cat Man
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First drink of fuel for the OS FS-61


This engine has waited possibly 30 years for this! Introduced to the market in 1983 and this being an un-run engine, who knows, maybe it has waited that long.

As usual with an OS engine of this vintage, there was nothing difficult about getting it running. I over primed it initially, but once that was cleared it fired right up. My first tank was spent running it between 4100 RPM and 6500 RPM alternating between the settings. This comes directly from the OS manual.

My second tank I began to lean it out just a bit peaking it at about 8500 RPM. It obviously needs more tanks and gentle running before reaching peak power but even on the second tank the idle was quite good. The airbleed screw was set at the factory and I didn't touch it. It was covering about half of the hole. All in all no surprises here, just another great running high quality OS engine.

OS FS-61 First drink of fuel (4 min 31 sec)


OS FS-61 Second run (6 min 1 sec)
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