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  #1  
Old 08-01-2022, 11:47 AM
SuzukiT350man SuzukiT350man is offline
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Location: Alabama
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Default 129 Issues

A couple years ago I dragged my Dad’s 129 he bought for $40 out of his junk pile and had no compression. I’m absolutely sure the tractor was parked because one hydro release valve was stuck closed and it was obvious some knucklehead hammered it in, who knows why. The exhaust valve was stuck open probably from sitting, no signs of a burnt valve or overheating and a few hits from the butt end of a hammer solved that problem.

I believe it has the Carter carb and it was more gummed up than anything I'd worked on before. I took apart and cleaned the carb, but the throttle butterfly was still stuck closed and I broke all the brass screws on the butterflies, I had no idea at the time that they were hammered in to prevent them from backing out. I’d have to sell one of my kidneys to get a Walbro carb so the Chinese knockoff would have to do. I put it on my working 129 (has a k241 swap) and it worked alright. Just to be on the safe side I ordered points and a condenser from ISaveTractors.com and tested those on my working 129 and they work great. As for the hydro release valves go, I stole a pair off a 169 that were in good condition. Adjusted the valves to factory spec. New head gasket, valve cover gasket, points cover gasket, gas tank cleaned and new fuel line and filter.

After all that, it idled perfectly, but once you give it throttle, it sputtered and wouldn’t move under its own power, only at idle. I even took the carb and ignition coil off my good one and it didn’t care how much you adjusted the carb, it just won’t go higher RPM's.

My Dad and I watched a Youtube video on how to set the ignition timing and did exactly as the guy said in the video and still ran like crap. I’d like to get it back to working condition, any advice or critiquing will be greatly appreciated
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Old 08-01-2022, 02:13 PM
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darkminion_17 darkminion_17 is online now
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Did you change the condenser? It may be bad, or you got one of Friday made China carbs...
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Old 08-02-2022, 07:50 AM
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ol'George ol'George is offline
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Usually an idle all day, but no rev up is a bad condenser as mentioned.
Have you tried the known good condenser from the good running engine on it?
Have you tried the known good carb. from the good engine?
if that does not bring joy, investigate if it spits out of the carb or barks out of the exhaust pipe, indicating a valve is hanging up at higher rpms.
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Old 08-02-2022, 01:11 PM
SuzukiT350man SuzukiT350man is offline
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Yep, i’ve taken the carb, coil, condenser, and voltage regulator off my good cub and slapped them on the project cub and it still does the same thing. My good 129 has a k241 while the other has the original k301, but they’re almost identical except the bore stroke length if I’m not mistaken. And by the way I put the chinese copy carb on my good mower and it’ll do the job but not as good throttle response as the walbro that was on it.
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Old 08-03-2022, 06:26 PM
mrfred54 mrfred54 is offline
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Do you have the governor adjusted correctly. Loosen 1/4 bolt at the governor shaft and arm and hold carburetor linkage to full throttle and turn governor shaft same direction as arm rotates for carb and tighten bolt. Throttle cable should stretch governor spring
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Old 08-19-2022, 01:51 PM
SuzukiT350man SuzukiT350man is offline
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I got it running, the person who had it before me had the condenser on the wrong side of the coil and I made the same mistake without realizing. Runs great now! Plenty of power and it doesn’t burn any oil at all. Got another issue so look for a new thread I posted if you have a minute to look. Thanks!
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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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