1950 cub won't start

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Greenthumbfarms
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Zip Code: 60416
Tractors Owned: 1974 Cub Cadet 1450
1975 Cub Cadet 1650
1977 Cub Cadet 1650

1950 Farmall Cub (Georgette)
1956 Farmall 230 (Gladys)
1966 John Deere 4020 (Jack)
1975 International Cub (Ozzie)
1976 International 766 (Bernice)
Circle of Safety: Y

1950 cub won't start

Postby Greenthumbfarms » Tue May 04, 2021 5:46 pm

Well the 1950 Cub i brought home a few months back had gotten back burnered then, I had college finals and then we started planting corn.

I sent the Mag away to a mag shop, I just didn't have the time to work on it myself and got it mounted today. Static timed it, hooked up the battery and re-polarized the Gen and turned on the gas.

Pull the starter ring and all it does is crank and kick every once in a while. Can someone point me the right direction? I just don't have the experience yet to know where to go from here.

I'll try and take some video cranking it later, I threw a battery charger on it and let it be a while. Neighbors have company out on the deck and I don't need to make them mad by cranking away on the old girl!

k hutchins
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Tractors Owned: 1948 Farmall Cub
193 plow
1948 snow/grading blade
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Cub 172 one row planter
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Re: 1950 cub won't start

Postby k hutchins » Tue May 04, 2021 6:44 pm

Start at the beginning. You say you sent the mag out to be worked on. What did they do?
Points, condensor, and coil good?
Double check your timing. When installed the end of the rotor should be pointing at app 1 oclock. On a J4 mag the rotor also has timing marks on it that need to be lined up.
After you've done all that, double check that you have your plug wires in the correct order and connected to the right plug.

If all that is correct, then check your fuel flow. Pull the plug on the bottom of the bowl of the carb and make sure you have a good steady flow.

When you cranked it, you didn't say if you had choked it at all. The carbs flood very easily. I usually choke until it coughs or sputters then push the choke off to continue cranking.

I'm sure others will chime in soon, but the above is where l would start.
Why is there never enough time to do the job right, but always enough time to do it over. :?:

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Greenthumbfarms
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Posts: 106
Joined: Mon Jun 29, 2020 4:59 pm
Zip Code: 60416
Tractors Owned: 1974 Cub Cadet 1450
1975 Cub Cadet 1650
1977 Cub Cadet 1650

1950 Farmall Cub (Georgette)
1956 Farmall 230 (Gladys)
1966 John Deere 4020 (Jack)
1975 International Cub (Ozzie)
1976 International 766 (Bernice)
Circle of Safety: Y

Re: 1950 cub won't start

Postby Greenthumbfarms » Tue May 04, 2021 9:02 pm

I should have written a better description. I tried starting with every throttle and choke combination there is, and gave it plenty of time to dry out if I thought it could have been flooded. It "coughed" a few times and ran about 15 or so seconds but wouldn't stay running. I was suspecting a fuel issue, but when I last asked, everyone told me to go with spark checks first.

The mag had corrosion in it from sitting unused (all the copper parts had that green oxidation), so I took it to my starter/generator/magneto man. The mag was completely done up, Coil, Cap, Rotor, points and condenser. All the works. I did check the timing on the rotor when I installed it, and ensured all of the plug wires were securely attached and in the right order.

I will check for a good fuel flow, and re-check the float drop and height, I set them a few months back, but with a Tape and not calipers. I don't think that was the best route to go...There were no obstructions in the carburetor or the jets today when I opened it to look.

Waif
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Re: 1950 cub won't start

Postby Waif » Tue May 04, 2021 9:18 pm

Did the plug wires get changed to non solid copper core?

Sounds like you're close to runnin.

When one times I had fail to run it was wrong plug gaps. And on one hard to run right , a plug gap had been near closed on one plug somehow by the prior owner.

Cylinders need to be lubed too. Did you prime the oil pump and galleys?

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Greenthumbfarms
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Posts: 106
Joined: Mon Jun 29, 2020 4:59 pm
Zip Code: 60416
Tractors Owned: 1974 Cub Cadet 1450
1975 Cub Cadet 1650
1977 Cub Cadet 1650

1950 Farmall Cub (Georgette)
1956 Farmall 230 (Gladys)
1966 John Deere 4020 (Jack)
1975 International Cub (Ozzie)
1976 International 766 (Bernice)
Circle of Safety: Y

Re: 1950 cub won't start

Postby Greenthumbfarms » Tue May 04, 2021 9:25 pm

I never opened the motor, I bought it "running needing tweaking" and got too tied up farming to work on it until now. I did prime the oil pump when I last tried getting it to run.

Ill have to check the spark plugs for gap.

As far as I know they are solid copper plug wires, but I will check tomorrow.

tst
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Re: 1950 cub won't start

Postby tst » Tue May 04, 2021 9:28 pm

is the rotor timed correctly to the mag? there are timing marks on the drive gear and rotor

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Greenthumbfarms
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Posts: 106
Joined: Mon Jun 29, 2020 4:59 pm
Zip Code: 60416
Tractors Owned: 1974 Cub Cadet 1450
1975 Cub Cadet 1650
1977 Cub Cadet 1650

1950 Farmall Cub (Georgette)
1956 Farmall 230 (Gladys)
1966 John Deere 4020 (Jack)
1975 International Cub (Ozzie)
1976 International 766 (Bernice)
Circle of Safety: Y

Re: 1950 cub won't start

Postby Greenthumbfarms » Tue May 04, 2021 9:56 pm

Yes, i pulled the rotor and checked for the timing marks

tst
10+ Years
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Posts: 4147
Joined: Tue Jan 12, 2010 2:08 pm
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Circle of Safety: Y

Re: 1950 cub won't start

Postby tst » Tue May 04, 2021 10:44 pm

ever check the compression ? you said it was tired

Waif
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Tractors Owned: 48 Farmall Cub "Seen Yore Dobbin"
53 F-Cub W/Loader.
Circle of Safety: Y
Location: Michigan

Re: 1950 cub won't start

Postby Waif » Wed May 05, 2021 11:59 am

Greenthumbfarms wrote:I never opened the motor, I bought it "running needing tweaking" and got too tied up farming to work on it until now. I did prime the oil pump when I last tried getting it to run.

Ill have to check the spark plugs for gap.

As far as I know they are solid copper plug wires, but I will check tomorrow.


Being so close to running....... I know the feeling , but not the cause.
Broken record on my part by repeating , but the choke lever on the backside of one carburetor was loose on one of my Cubs.
Till I watched the actual plate's action by the small rectangle piece on the outside , the choke plate was willy nilly in position. And combatting my attempts to regulate it ; by choking the engine when I thought it was opened..

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Greenthumbfarms
Cub Star
Cub Star
Posts: 106
Joined: Mon Jun 29, 2020 4:59 pm
Zip Code: 60416
Tractors Owned: 1974 Cub Cadet 1450
1975 Cub Cadet 1650
1977 Cub Cadet 1650

1950 Farmall Cub (Georgette)
1956 Farmall 230 (Gladys)
1966 John Deere 4020 (Jack)
1975 International Cub (Ozzie)
1976 International 766 (Bernice)
Circle of Safety: Y

Re: 1950 cub won't start

Postby Greenthumbfarms » Thu May 06, 2021 9:34 pm

A good suggestion on checking the choke, i pulled the air intake off and it is working properly.

I have not checked compression yet, so it looks like I have a weekend project. Have folks had good luck with the Harbor Freight compression tester or is it not very accurate?

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Barnyard
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Re: 1950 cub won't start

Postby Barnyard » Thu May 06, 2021 10:00 pm

Is this the same one you are bringing to the Bash?
There are two ways to get enough Cubs. One is to continue to accumulate more and more. The other is to desire less.

Circle of Safety

User avatar
Greenthumbfarms
Cub Star
Cub Star
Posts: 106
Joined: Mon Jun 29, 2020 4:59 pm
Zip Code: 60416
Tractors Owned: 1974 Cub Cadet 1450
1975 Cub Cadet 1650
1977 Cub Cadet 1650

1950 Farmall Cub (Georgette)
1956 Farmall 230 (Gladys)
1966 John Deere 4020 (Jack)
1975 International Cub (Ozzie)
1976 International 766 (Bernice)
Circle of Safety: Y

Re: 1950 cub won't start

Postby Greenthumbfarms » Fri May 07, 2021 6:52 am

No, although if I'm still having a hard time then I'm sure it will find its way into my trailer...


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