My neighbour brought his sled(07 rev 800r) over to me because he couldn't get it to start. He said that last season he had a problem starting it and getting it to idle. He said once it was running it pulled strong all day, but he had to feather the throttle to keep it idling. He is guilty of leaving old gas in with no stabil the last couple summers so I assumed that the carb and jets were just plugged up. I pulled the carbs and cleaned them up and put them back in. It didn't want to start, back firing every 5-6 pulls so I put a little gas in the cylinders and it fired up but would die if you let off the gas. I figured maybe I missed something in the carbs so I pulled them out again. I cleaned them very thoroughly this time, gave the carbs a soak in my parts washer, blew out all the passages, and cleaned the jets. Put them back in and it still won't start, tried gas in the cylinder and it almost starts, idles for half a second and dies. When I choke it it seems to backfire more, which seems strange because I thought a lean condition caused backfiring? This sled only has 600km on it, new gas in the tank, and new plugs. Any idea as to whats causing it to backfire? Any help would be most appreciated because he is supposed to leave for Revy on tuesday.
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