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Message: <blockquote data-quote="Stumpalump" data-source="post: 437688" data-attributes="member: 13140"><p>You are beyond a mere carb adjustment if it runs better with the choke and so lean that it seizes. Clean the carb the right way or do the "poor" mans way like me if it's beyond your ability. Pull every jet, adjustment needle and stuff  you can and spray aresol sea foam in the holes. I do that on a ruff runner but yours seized so pull the carb and do it right paying attention to the float level. As far as your premix goes then yes it is different. It has a different specific gravity because it's basically AV gas/race gas. Tweeting your screews should do it but they may wind up a full turn or two from the starting point. Read your plugs immediately after a long wot run. You should change you plugs anyway since it ran so hot. If it's still running lean then switch to pump gas. Also check the JASO oil rating in that gas you are burning. 90% of today's oil are good for everthing but there is no telling what the refinery is dumping into bulk lawn mower premix.</p></blockquote><p></p>