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Hard to diagnose any engine over a forum any way ,theres a lot of factors that play ,like fuel pressure to the tank ,tank seal , dirty fuel tank ,dried up needle O-rings ,leaky head or loose head bolts ,cold weather ,bad glow plug! I right now am battling dried up needle O-rings an is acting...

Cking gave good tips ,but if you have already walked all over your settings with no cure ,chances are that your carb needles o-rings are toast ,meaning they have harden over time an are leaking like a siff giving you an unstable tune ,thats why you have been having to lean it. The needles are...