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I have a yamaha 60 enduro it's a 2 stroke. After I have been idleing around for a while say in like trawling. When I go to give it abit and take off it splutters and coughs sounds like it is running on 1 cylinder. After I keep trying to rev it and muck around it comes good and works all good again. It only plays up after I idle for a while when the engine is warm. I have changed the coils and spark plugs and am know trying to run the engine leaner just In case the plugs are oiling up. I'm not sure what the problem is just wondering if anyone has had Simlar problems and is there anything else I can do or check.