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#1
01-15-2017, 01:43 AM
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M-18 running rough/missing
OK, new thread on the 1811. We've never used this machine other than driving around a bit. The guy I bought it from didn't either. He did have someone try to work on the carb because it wasn't running well. So here is the problem, there appears to be an occasional miss causing it to run rough. Here is what we have done:
compression--right side 130, left 120 spark plugs--runs the same with old or new plugs. Actually pulled the new plugs to put in the old ones. With only 10 minutes of running the new plugs appeared sooty. carb--cleaned it out (didn't remove welch pugs), opened it up again and bent float tab a bit. Fixed jet Walbro. intake--I sprayed 2 different types of carb cleaner around where the intake bolts up--no noticeable changes in running Suspecting a lazy valve--sprayed 2 types of carb cleaner and penetrating oil in the air intake trying to lube things up. Even dumped straight SeaFoam in there also added some to the gas. Not really improving anything. Considering getting some Marvel Mystery oil and putting in the gas like you do when the old cast iron Kohlers have a sticking valve. Here is the really weird part. If you pull the left plug wire while it is running, it runs worse, but keeps going. If you pull the right wire, it will die within a few seconds--and will backfire when you hook it back up. Even thought the right side is apparently doing more "work", that plug will be colder. After 3-4 minutes I pulled the pugs out and could hold the one on the right. The left "weaker" side was too hot to hold. I'm thinking lazy valve or bad valve clearance on the left side. Anyone else got a guess? 
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2072 w/60" Haban 982 with 3 pt and 60" Haban 1811 with ags and 50C 124 w/hydraulic lift 782 w/mounted sprayer 2284 w/54" mowing deck 
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