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#1
11-25-2020, 08:06 PM
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I invented the wheel today (running lean)
I made an interesting discovery today.
When it ages, modern crappy gas behaves in small Kohler engines, like a super lean running engine. The Cub: Ratty old 122 that usually runs well. The symptoms: Starts kinda grudgingly then runs ok, until after a while you can hear the exhaust note change a bit...the power begins to drop off, then it finally stalls (after feathering the choke to keep it alive a bit longer) andddd....it stalls (often with a backfire). Cool down, and it'll run again until the SAME set of symptoms appears. I did all the normal stuff. Checked fuel flow ( no grass is going to grow THERE for a while) , spark plug, spark function... all OK. Clean fuel tanks, filter, sediment bowl. All ok. As I was messing with the tank, I noticed the fuel didn't seem as aromatic as normal gas should be. There was not nearly the same strong fumes. Hmmm... this gas is only a few months old, still.... Dumped the gas, and went and got some 100% gasoline gas. Came home, filled the tank of the 122 and all was well. Engine fires almost as soon as the key is turned (which is good as the compression release doesn't work on this dog!) . Ran it for hours, with zero problems. Restarts hot, never stalls, idles well. Beautiful ! So...I know there's been other threads about these symptoms and I KNOW that modern gas is crap, but it took until today to realize "this thing should run fine! It's all the way it should be. The Kohler engine is a simple, reliable mule. What's wrong???" The only thing left was the gas. 
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61 and 63 Originals 123 (2) 782D 106, 147, 122 102 parts It's only original ONCE!
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#3
11-26-2020, 12:38 PM
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I use separate fuel cans for my Cubs,with a good mid-grade fuel and add a little Chevron Techron Fuel System Cleaner I get at the local NAPA store, seems to make them run great!
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 129, 124
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#4
11-26-2020, 05:35 PM
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This time of year since I don't use them much save for the occasional snow storm I put sta bil fuel stabilizer in the gas can.
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Daniel G.  . (May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.
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