Just visited a club down in FL and I was talking to a gentlemen and that subject came up. He highly recommends putting a check valve in the exhaust line. It keeps positve pressure on the tank when the engine is at idle. He says it has eliminated the engine dying when you pull the throttle to idle. I pull the line off the muffler when I refuel but I don't know how you would handle that if it was a cowled engine. Anyway thats what he says and I have yet to try it.

chopper man