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Farmall & IHC Tractors Discussion Forum
Order Farmall Cub Parts Online

FARMALL CUB CRANKS TO GOOD

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flopguns

02-14-2016 05:14:40




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HELLO, HOPE SOMEONE OUT THER CAN HELP . WHEN I START MY CUB IT FIRES AS SOON AS I HIT THE STARTER BUT DOES NOT STAY RUNNING WHICH KICKS THE BENDIX OUT ON THE STARTER I HAVE TO KEEP TRYING TO START IT OVER AND OVER. THIS IS THE SECOND CUB THAT I HAD THAT DOES THIS, KEITH




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Tom Fleming

02-16-2016 04:09:12




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
so, one thing that came to mind that could be happening. If your impulse is NOT working correctly, if the engine starts right up on the starter, and the starter kicks out, when the engine is slowing down below the impulse RPM, the spark would possibly be weak enough to not fire the engine as that slow speed.

I am not saying that is what is happening, but it could be one possibility............I also agree that the timing should be checked as well. A video of what is happening would go a long way to helping us diagnose what is going on. If you can take a video, I'll be glad to help post it here for us to see.

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Tom Fleming

02-16-2016 04:04:01




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
Ok, I was able to find my IHC mag manual easily (wow, that was a surprise! :) ) I was also wrong on the F4 mag (that happens too often lately when I go from memory)
Here are the specs for mag impulse drop out:

E4A : 140-240 RPMs adjustable

F4: 180-280 RPMs

F6 : 130-200 RPMs

F4 diesel: 60-130 RPMs

H4 Early: 120 RPMs

H4 after H4-7635: 150 RPMs

H1: same as H4
J4: my manual was produced before the J4 was introduced, so I would expect that it follows the "late" H4 specs.

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Tom Fleming

02-16-2016 03:44:15




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
for what it's worth, the impulse dropping out does NOT impact the starting if you are turning the engine fast enough for that to happen. The reason there is an impulse on a magneto, is to turn the mag faster than you can spin the engine when starting to increase the output spark voltage. The faster you spin a mag, the higher the output spark voltage. that is a fact. Now, if the impulse is malfunctioning, AND it is not working at designed RPM's, then yes, you will have a hard starting engine.

so, if you are spinning the engine faster than the impulse is set to drop out, that only improves the spark. I am pretty sure that the F4 series mag impulse is designed to drop out at 400 RPM's. Not sure on the H4 mags, but I believe it is a wee bit slower. I'll get my mag book out to get the real numbers and post here.

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kevinj54

02-15-2016 06:08:11




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
Quoting Removed, click Modern View to see

They often crank fast enough to kick the impulse out.

Towing turns them faster than the starter.



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tn terry t

02-15-2016 01:24:23




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
I have an old A with mag you can push it 3 foot its running you can hand crank it it fires right up you can crank a brand new 12 volt dead it wont start . I have a push button instead of the pull start solenoid I can bump that button slowly the blasted thing fires up



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Jim Becker

02-14-2016 20:29:41




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
I have a Cub that had been converted to 12 volts before I got it. It didn't start well. I noticed the magneto impulse clicking randomly. It was turning just barely too fast for the impulse to work reliably. I switched it back to 6 volts (alternator wasn't working anyway). It has been starting reliably ever since.

Pull starting normally turns the engine so much faster that the mag will throw a decent spark without a working impulse.

In this case, the OP hasn't said what kind of ignition system he has, voltage or anything else about his electrical system. So whatever anyone says on ignition problems is little better than a guess.

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flopguns

02-15-2016 05:10:13




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 Re: FARMALL CUB CRANKS TO GOOD in reply to Jim Becker, 02-14-2016 20:29:41  
HELLO 6VOLT SYSTEM



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john *.?-!.* cub owner

02-14-2016 17:34:48




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
check the ignition timing.



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flopguns

02-15-2016 05:01:16




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 Re: FARMALL CUB CRANKS TO GOOD in reply to john *.?-!.* cub owner, 02-14-2016 17:34:48  
HELLO I WILL CHECK THE TIMMING KEITH



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Janicholson

02-14-2016 15:44:21




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
Take the rubber hose off of the carb intake. Place a piece of #9 wire in the intake horn just past the choke and at the bottom. Pull the choke out and with just a little pulling tug on it, mark the wire where the choke rod passes through the support. Take out the wire, put the hose back on, and only choke it t the mark. This will provide just enough choke to get it running, and not so much that it floods. As it warms, push it in as needed. A choke cable instead of the rod might also allow a careful setting of the device. I have three engines and many years of experience with this issue. Another possible solution is to use a lawn mower battery with less amps. Jim

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kevinj54

02-14-2016 15:13:14




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
Quoting Removed, click Modern View to see

If ya got a mag & 12 volt battery you are cranking to fast for the mag.



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flopguns

02-15-2016 05:04:18




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 Re: FARMALL CUB CRANKS TO GOOD in reply to kevinj54, 02-14-2016 15:13:14  
HELLO, 6 VOLT SYSTEM



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gene bender

02-14-2016 20:09:41




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 Re: FARMALL CUB CRANKS TO GOOD in reply to kevinj54, 02-14-2016 15:13:14  
No such thing as cranking too fast for a mag. What makes you think that way I suppose then if you pull start it wont start because the engine would be turning too fast



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Rex Simpkins

02-14-2016 14:53:56




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
I have a 1974 Cub doing the same thing, never seen anything like this before, its been too cold to look at it and the garage shop is full right now. Hopefully someone will have an answer.



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flopguns

02-14-2016 14:03:21




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
HELLO I CAN,T CHOKE IT IT WILL FLOOD TRIED TWO DIFFERENT STARTERS NO LUCK WILL HAND CRANK FINE, RUNS GOOD KEITH



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Roger46

02-14-2016 11:54:08




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
My cub does the same thing. The starter on the cub spins it over so fast that as soon as it fires the starter kicks out. I pull the choke out all the way and when it starts I feather it in like DGinVT said he does. If you convert to 12 volt like some have done, it most be even more of a problem. I have a completely rebuilt starter, good 6 volt battery, and large cables, so it really spins it over. Also, engine is overhauled and in perfect condition. Again, my best success is in the choking operation.

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flopguns

02-14-2016 14:11:56




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 Re: FARMALL CUB CRANKS TO GOOD in reply to Roger46, 02-14-2016 11:54:08  
HELLO, I CAN,T EVEN LOOK AT THE CHOKE WITHOUT IT FLOODING, KEITH



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DeltaRed

02-14-2016 07:41:29




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
8N ford did that. Turns out it was a bad starter drive.



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flopguns

02-14-2016 14:13:33




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 Re: FARMALL CUB CRANKS TO GOOD in reply to DeltaRed, 02-14-2016 07:41:29  
HELLO, TWO DIFFERENT STARTERS ONE WITH A NEW BENDIX ?? KEITH



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DGinVT

02-14-2016 06:55:04




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
When starting have you tried to "feather the choke"? Mine starts like that and I let the choke pull rod in slowly till it's warmed up enough to stay running.



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Tom Fleming

02-14-2016 06:11:38




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
in addition to what Gene said, have you tried to pull start it? Does it start and run every time? Sounds like potentially a hokey electrical problem with the wiring......maybe.



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flopguns

02-14-2016 14:15:16




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 Re: FARMALL CUB CRANKS TO GOOD in reply to Tom Fleming, 02-14-2016 06:11:38  
HELLO, HAND CRANKS FINE, STRAIGHT WIRED IT SAME PROBLEM, KEITH



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gene bender

02-14-2016 06:06:48




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 Re: FARMALL CUB CRANKS TO GOOD in reply to flopguns, 02-14-2016 05:14:40  
check the wiring maybe you don't have voltage at the coil after releasing the starter rod



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flopguns

02-14-2016 14:16:34




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 Re: FARMALL CUB CRANKS TO GOOD in reply to gene bender, 02-14-2016 06:06:48  
HELLO, WHEN ITS WARM WILL CRANKS FINE, KEITH



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