On sub diesel we had a mechanical flyweight gov that maintained engine speed to hold bus frequency. My 240 has an electrical cruise control, and though it might be possible, you prob wont need it. I would try to use a mechanical cable, a vernier, or something with a lock once adjusted. Start the engine at idle, let it warm up, monitor generator frequency and raise speed to 60hz (1800 rpm) and lock the speed. Unless you are running a huge electrical load, engine speed droop shouldn't be a problem. And once you do start something big, just adjust frequency after it's started. Mosler or someone should have a freq meter cheap, or you could monitor it with most hand held DVM's. Nest idea, where did you get the generator?

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2000 C230 Kompressor "Frosty"

2007 PT Cruiser
2001 VW TDI Beetle
1999 Landrover Discovery II
1971 Corvette

Gone: 97 Cabrio, 83 240D, 93 VW Eurovan, 95 Volvo 850, 93 Chevy Astro Van, 77 VW Bus, 99 VW Jetta, 74 VW Bus