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Thread Tools | Display Modes |
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#1
02-01-2024, 12:28 PM
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Bad spark for starting
I picked up a cub cadet 102 a little while ago. It had a bad paint job and nuts and bolts were very rusty, but it was mostly complete including a rear lift. The seller said that it ran but when I got it home, I discovered that it did not run well at all. I took the carb apart but it was not rebuildable (the main jet was stripped) so I invested in a new carburetor and readjusted the governor. It also needed battery hold down brackets. It now starts harder than my other Kolhers. It runs good when warmed up. It had good tires and I took the front ones off and changed them with one of my 100s.
I took the spark plug out and cranked the starter. The hard starting is from the spark plug not firing when the key is turned to “start”. When I let off the key it sparks great. What is going on?
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A 122 with weights and a deck for mowing trails. 100 with loaded ags, three point for ground engaging brinly cultivator, brinly disc, thatcher, cart and snow plowing. 100 with weights for wood hauling. Rusty functional 102 with rear lift. Elec Trac E15 for finish mowing. 
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#2
02-01-2024, 01:33 PM
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Sounds like you need a new ignition switch.
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Up to 530 and counting... I give up updating my profile!
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#3
02-01-2024, 01:38 PM
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it's wired wrong, or
that condition happens is when someone installs an incorrect ignition switch. A boat load of switches advertised as replacements, while fitting the hole, are not set up correctly to power the coil in start and run position. Check out the switch with your Volt meter to see what terminals are hot in start and run position. there are diagrams in the service manual. 
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#4
02-01-2024, 01:52 PM
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Try releasing ignition just a slight bit( not all the way to the run position ) while cranking over with sparkplug out of hole and grounded to head. If spark gets better you either have wrong or dirty switch. Good luck !
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#5
02-02-2024, 05:25 PM
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Weak spark fixed
The switch checked out ok. The PO did put in the wrong wiring harness, but I got that sorted out and have a bunch of useless wire.
I checked the S/G for output and got nothing! My neighbor suggested that it could be the brushes. I had some brushes, springs and bearings laying around so I decided to open the S/G and check it out. Sure enough one of the brushes had got wet and rusted. Put in the new stuff and it works good now. I guess it was drawing too much juice to both crank and to fire the plug. Feels great to have another running and working Cub! Thanks all.
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A 122 with weights and a deck for mowing trails. 100 with loaded ags, three point for ground engaging brinly cultivator, brinly disc, thatcher, cart and snow plowing. 100 with weights for wood hauling. Rusty functional 102 with rear lift. Elec Trac E15 for finish mowing.
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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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