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Well as normal, fix one problem and find another. My C-120 with 12hp K-301 has been running very smoothly. I rebuilt and tuned the carb a few months back. Yesterday I made a trip from the garage to the backyard (2 minutes) and got off the tractor and let it idle at mid-throttle. After about 30 seconds all of a sudden it started sputtering out, puffing black and I struggled to keep it running. Finally it died and would not restart.
I took the air filter off and it was wet with fuel. Trying to start it again, it would sputter and spit fuel out of the carb but not stay running. So naturally I took the carb off (it was clean) and gave it another good cleaning anyway. Float is good when shaking it. Reassembled and put back on the tractor but it still isn’t running right. It will start up after leaving it sit for a while (but rough) and after only running for a few minutes it will sputter, die and not restart.
I checked right after it died and and there was spark. Took the fuel line off the carb and it seems to be pumping fine.
What do you guys think? Points and condenser? Coil? Stuck valves?
i really don’t think it’s the carb unless I somehow installed the needle or seat wrong. Super strange that it has been running like a top, starting on second crank and all of a sudden struggles and won’t start.
I’m pretty stumped here, so I thank you for your help!
By RJ Hamner
Let me first say that it ran when I brought it home. Drove it around the guys yard, tried out the mower, drove it onto the trailer and drove it off the trailer and into the garage.
I've done a "ground up" restore on the tractor (70 Charger 12). Swapped out the breakerless for a battery ignition and swapped out the 10 amp for a 15 amp stator, flywheel and regulator.
Pulled the head, looked pretty good, new head gasket and head bolts.new fuel pump, fuel lines,new switches and wiring, new aftermarket carb, new coil, coil wire, new points, new throttle and choke cables.
Static timed (twice just to make sure) Have tried Autolite 216's and the hotter 437's. changed the condenser to the high dollar Kohler one.
It will idle but when I give it some throttle it stumbles or will rev up a little then quits.
I've gone thru the "trouble shooting " steps multiple time and to no avail
Anyone got any ideas?? I am willing to try most anything at this point
By The Gman
Finished up work on the A800 ranger. Time to figure out the c120.
The ranger got;
Complete rewire. 👍
Re-timed and a new head gasket.👍
Carb rebuild. 👍
Full service. 👍
My daughter is gonna use it this year. She has just under 1/2 an acre to cut.
Now the challenge is the c120. Picked this up in Jan. Price was right and I was really just after the motor but the rest of it just had to come home too. Not sure if it's all there but the fun will be in finding out. So far I figure a broken clutch pedal and one rotted tire. The po had already taken it apart to restore but other things got in the way. The motor is stout and roars like a tiger.
I'm gonna put it all back together first...... fix what I find then tear down to restore.
It's the transmission I don't know about. Po said it works fine......... Hmmmmm.
Don't know much about them at the moment but "forum" research ans help here I come!!!
Transaxle oil is low but clean and the tow valve doesn't look like it's been loosened for a while. The frame sat outside for a year.
Thought I might change the oil and run it with an electric motor to see?????
The axles are free and smooth.
Anything I should be careful of?????
This is my first post. Several years ago I bought a c120 auto and have used it to mow and snowplow with great success. The other night in the midst of a snow storm I was in a hurry to get going, and didn't check the oil and didn't give the engine enough time to warm up. Result seems to be a broken connecting rod, since it cranks now much faster than it did before and won't start when it was a terrific starter before.
So I'm looking for ways to repair the damage I've done. I really love the tractor, comparing it to modern ones that feel like tin foil convinces me that I want to fix this iron horse.
I am in southwest Michigan, and looking for help.
thanks in advance.