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Any suggestions for a lightweight gas-powered engine in the 25 hp range?

I need a lightweight engine in the 25 hp range for an industrial application. I've been using a Honda GX690 (V-twin 22 hp), but it is too heavy and doesn't work well at high altitude. A diesel engine would be ideal, but I doubt that the power to weight ratio will be very good. Any suggestions? Perhaps something out of a snowmobile or motorcycle?

Update:

My local Honda dealer tells me that high altitude jets for the GX690 carburetor are not available. Do you have a source for jets, or any ideas for a new type of engine?

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  • 7 years ago
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    No matter what engine you get, for high altitudes the carburetor is going to need to be re-jetted. Perhaps that would make the Honda run like it should.

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