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#1
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I was going over the old 128 getting her ready to cut grass and she wouldn't start. I checked for spark and zero. I dove in and found the point block where the wire from the coil connects burnt up pretty bad. I had put new points in last spring when I used the tractor for the first time after inheriting it from my late uncle and ran it without issues. I believe the coil is not original and due to the damage to points, is not internally resisted (not marked either way) . In an effort to make a quick fix, i flipped the points insulator block over (less damage) and reinstalled the wire from the coil. It is not making a contact to ground now as best i can tell visually. I set the points at .020 gap. I also installed an external resistor that i had in the wire from the ignition switch (which goes to the positive terminal on the coil. I am now getting 13 volts at the coil and points. Still no spark at the plug when cranking so i checked the coil with an ohmeter and it was open. I checked another used coil i had as well as the coil off my running super c. Both had 5 ohms. I installed the used coil and the coil off the super c and neither will give spark at the plug. I ohmed the old plug wire and it reads 4 ohms. I tried a new plug wire from a set i bought for my pickup project as well. Still nothing. I ohmed this new wire and it read 1000 ohms. (???) i tried the old and new plug when checking for spark. I cant figure why the points dont spark when i open and close them manually. Still shorted out from the melted block i suppose. guess i will start throwing parts at it next week; new internally resisted coil, new points and new plug wire. Any suggestions?
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#2
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Refer to the following link for checking the coil....
https://www.onlycubcadets.net/forum/showthread.php?t=11 The coil should be to spec on continuity and also be the correct replacement part. Isn't the super C tractor a 6 volt system? Also, check for continuity from negative wire removed from coil to ground with the points open. There shouldn't be any. With points closed, should read low resistance. I don't think there is resistor in the plug wire, but others will chime in. Usually no/low resistance on the plug wire. Finally, replace the points anyway.... If it is burnt, it is likely done. Do replace the condenser while you are at it.
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Two 125's and a 124 all with 42" decks Plow blade #2 Cart QA36 snowthower |
#3
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Thanks Billy-O for the guidance. I have swapped a few points and troubleshot ignition gremlins a few times over the years. This is the first time I came up scratching my head. BTW, the Super C was originally 6 volts but has been converted to 12v. I forgot to include that.
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#4
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Is there power to the coil when the key is in the "crank" position?
You may have answered this but I'm not sure: If you manually open and close the points when the key is in the ON position do you get spark? Is the condenser shorted/leaky (resistive)? Just some ideas.
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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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#5
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I was not getting spark at the points with key on and manually opening and closing them. Condensor is good. I happened to remember that there was still a coil on an old parts tractor I had. (CC 73) so I took it off and checked it. (It ohmed out at 35 ohms) i figured i might as well try it. Guess what? SPARK!!! I also robbed the insulator off the ild points in the 73 while i was at it and swapped it out later. I have a new coil on the way, since I was out of “spares”! I have no idea why it will not work with the coil off the Super C, though, as I reinstalled it and it started right up! |
#6
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Power at the points but no spark.....
Dirty or damaged points. Drag a piece of 220 grit though them a few times, and recheck after resetting the gap. For best results, static time the engine. |
#7
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Just a thought... Be sure the condensor is getting a good ground by being sure the connection is shiny and tight, (maybe even using a jump wire to insure a proper ground.) Happened to me once. Good luck. Carpetbagger
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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.
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