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<blockquote data-quote="jltrent" data-source="post: 1660259" data-attributes="member: 21075"><p>Sounds like you have a 550xp as you did not say Jonsered version (same saw) as with those people either say they are great or problematic. (a lot have hot start issues or develop it, IMO coil related as you have eliminate the carb hopefully) If the crankcase passed vac and pressure test that eliminates a lot. It does not sound like your problem, but a pressure/vac test on the tank which only takes about 5 minutes I have found saws in like new condition people had given up on was the problem. Also a pretty rare problem I have had a couple times was the North/South magnets on the flywheel, one will get weaker. A MS660 I tried everything even switch parts on another to try and the North magnet on the flywheel had gotten weaker or came from the factory like that was the problem.</p><p></p><p>Hard starting and then smoking like crazy it sounds like it is loading up on fuel and a weaker spark(also could only be doing this after hot as you did not say). Autotunes run too lean from the factory and it is amazing they will last. From my experience chain speed is great on Autotunes, but low end torque is not very good. I compared an older Stihl 036 to a new Stihl MS362 cutting with the same bar/chain. The 036 would win every time, but it did burn a little more gas and probably pollute more.</p></blockquote><p></p>
[QUOTE="jltrent, post: 1660259, member: 21075"] Sounds like you have a 550xp as you did not say Jonsered version (same saw) as with those people either say they are great or problematic. (a lot have hot start issues or develop it, IMO coil related as you have eliminate the carb hopefully) If the crankcase passed vac and pressure test that eliminates a lot. It does not sound like your problem, but a pressure/vac test on the tank which only takes about 5 minutes I have found saws in like new condition people had given up on was the problem. Also a pretty rare problem I have had a couple times was the North/South magnets on the flywheel, one will get weaker. A MS660 I tried everything even switch parts on another to try and the North magnet on the flywheel had gotten weaker or came from the factory like that was the problem. Hard starting and then smoking like crazy it sounds like it is loading up on fuel and a weaker spark(also could only be doing this after hot as you did not say). Autotunes run too lean from the factory and it is amazing they will last. From my experience chain speed is great on Autotunes, but low end torque is not very good. I compared an older Stihl 036 to a new Stihl MS362 cutting with the same bar/chain. The 036 would win every time, but it did burn a little more gas and probably pollute more. [/QUOTE]
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