When I wrote that last sentence, I started to second guess myself, ![]() I don't know if that's right, but maybe 1,000 RPM is too slow for this motor to keep it together. I was looking around at photos while developing this answer (needed to know whether this was a twin or a 4-cylinder), and one resource said the idle speed should be 1,200. That,Īnd the fact that it will run at higher RPM would seem to rule out fuel The carburetors, so the fuel system would be the most suspect. You will need to do this in a way that gets propane to both carburetor inlets, maybe rigging a Y with vacuum hoses and If you can get closer to an idle while supplying a supplementary fuel You can try pointing an unlit propane torch into the inlet air, and see If the idle circuit flows insufficiently, that becomes a transition to Main circuit falls off, and the idle circuit is supposed to take over. ![]() In normal operation, as the engine slows, the fuel delivery from the ![]() The intake valve opens, and that flame gets a shot at the new mixture Lean mixtures burn very slowly, at times slowly enough to continueīurning through the power and exhaust stroke, causing a backfire when SOURCE: my gs500f is back firing through the CARB.
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