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I have issues with my yamaha xj600, engine isn’t running. Spark plugs are new and have spark, when i screwed them out of motor block they are wet with fuel. Checked fuel lines, cleaned carbs but nothing. Then i pour fuel directly in carbs the. Engine starts to sneeze and shoot the flames but thats all. Before winter get engine running but for short time with full trotil and got maximum 1500rpms

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Has it been sat with fuel in the tank and carbs over a long time? cos if it has then your carbs are bunged up with old fuel and will need to come off for a through clean. Try some "Easy start" up through the air filter to see if it fires, if it does then you have a solution to the problem, lot's of cleaning. Try carb cleaner and sone fine wire through the passageways inside the carb. Remove  the jets and blow them out and if you can find a carb refurb kit which will help freshen up the thing.

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Take out the plugs & leave for a day or two,,sounds like your flooded  out,  check your oil level,,if its High,,it be fuel in it,,, change it,,,


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