Won't start!

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Dusty B
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Won't start!

Postby Dusty B » Sun Apr 17, 2022 12:20 pm

New (to me) F-cub - runs great after a short tug to get it started! Good spark, fuel supply OK, runs like a charm once it gets going but just won't fire off on its own?? Pull it 10' and it's going! Open to suggestions! Don't want to tear into it if there is an easy solution but sure has me stumped! :help:
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

SamsFarm
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Re: Won't start!

Postby SamsFarm » Sun Apr 17, 2022 12:33 pm

I am just speculating, but I suspect a dirty carb.

Sounds like it is strugling to get any fuel with the vacuum from getting turned over with the starter.

But maybe the pull starting is generating more suction to pull the fuel out of the carburator!
1968 Cub Fast-Hitch

Eugene
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Re: Won't start!

Postby Eugene » Sun Apr 17, 2022 2:31 pm

Magneto ignition system? Impulse coupling not working.

Battery powered ignition system? Mechanical advance stuck at full advance.
I have an excuse. CRS.

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Dusty B
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Re: Won't start!

Postby Dusty B » Tue Apr 19, 2022 8:21 am

Eugene wrote:Magneto ignition system? Impulse coupling not working.

Battery powered ignition system? Mechanical advance stuck at full advance.

Advice on how to unstick it?? Tried using starting fluid - no help!!
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

Crimson Tim
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So far, Paul and Ringo have arrived. John and George were supposed to follow ages ago, but apparently have gone awol. Long story.
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Re: Won't start!

Postby Crimson Tim » Tue Apr 19, 2022 9:48 am

How is the power once it does get started?
If it is difficult to start, but runs ok after a pull start, I would wonder about compression. Maybe rings are stuck or valves need adjusting? I’d consider dry & wet compression tests to see where you’re at and maybe letting some seafoam soak in the cylinders for some days.

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raystractors
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Re: Won't start!

Postby raystractors » Wed Apr 20, 2022 7:16 am

Crimson Tim wrote:How is the power once it does get started?
If it is difficult to start, but runs ok after a pull start, I would wonder about compression. Maybe rings are stuck or valves need adjusting? I’d consider dry & wet compression tests to see where you’re at and maybe letting some seafoam soak in the cylinders for some days.

I second this. A Cub with poor compression sometimes will start with a pull.

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Dusty B
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Re: Won't start!

Postby Dusty B » Wed Apr 20, 2022 9:25 am

Seems to have good power, no smoke, once it is running! Hate to pull the hood if I can avoid it!
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

Eugene
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Re: Won't start!

Postby Eugene » Wed Apr 20, 2022 10:01 am

raystractors wrote:I second this. A Cub with poor compression sometimes will start with a pull.
Dusty B wrote:Seems to have good power, no smoke, once it is running! Hate to pull the hood if I can avoid it!
If your compression tester has a flexible hose, you do not need to remove the hood.
I have an excuse. CRS.

tldec50
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Re: Won't start!

Postby tldec50 » Wed Apr 20, 2022 4:33 pm

Seems like these cub tractors have their own starting procedures.my 77 needs 1/4 throttle setting to start right up,my 74 needs 1/2 throttle to start right up,but my 48 will not start with throttle setting just couple notches above the lowest setting.I can crank over till battary runs down but if I put throttle in lowest notch it will start within 2 revolutions.Maybe try different throttle settings and maybe it has a setting it likes.

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Glen
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Re: Won't start!

Postby Glen » Fri Apr 22, 2022 7:25 pm

Hi,
You didn't say if this is the red, 1977 Cub in your other post.

If it is, and has the IH ignition switch, other people have said the ignition switch was the cause of similar problems on other Cubs.
Something goes wrong inside the switch, I guess, and the coil doesn't get power when starting, I think was what was said before.
Connect your test voltmeter to the coil 12 volt power wire, at the coil, and turn the key to start, and see if the coil gets power.

TM Tractor has a new switch, then you can use the same plug to connect it, I think.
You can look at the pic at the listing. :)

Eugene
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Re: Won't start!

Postby Eugene » Fri Apr 22, 2022 8:21 pm

Timing light. You can check the timing even if the tractor will not start.

You need to diagnose the problem before you attempt any fixes or purchase parts.
I have an excuse. CRS.

outdoors4evr
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Re: Won't start!

Postby outdoors4evr » Mon Apr 25, 2022 5:58 am

Speculation is all we can do. Here's my guess.
While using the starter, the battery voltage is being dragged down low enough that the coil is not operating. Need to check for spark while using the starter. Make sure that the connections to the battery cables (both ends) are clean and shiny
Does it start fine with the hand crank?
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Dusty B
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Re: Won't start!

Postby Dusty B » Thu May 05, 2022 3:10 pm

:D Found one major problem, hope its the only one! pulled the carb, one of the PO's had inserted a screen into the intake but when the gad line was inserted, it compressed the screen into a bb sized ball!!! :roll: Don't know why it was able to even get enough gas by pulling it to run but it did! Will go out now with a cold start and see if things function the way they should!!
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

Waif
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Re: Won't start!

Postby Waif » Fri May 06, 2022 8:26 pm

Dusty B wrote::D Found one major problem, hope its the only one! pulled the carb, one of the PO's had inserted a screen into the intake but when the gad line was inserted, it compressed the screen into a bb sized ball!!! :roll: Don't know why it was able to even get enough gas by pulling it to run but it did! Will go out now with a cold start and see if things function the way they should!!


:{_}:

k hutchins
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Re: Won't start!

Postby k hutchins » Sun May 08, 2022 12:10 pm

So, how did it go after finding the constricted fuel flow?
Also you never posted whether you're dealing with a mag or distributor. Or whether it would start with a hand crank.

That info would help us help you going forward.
Why is there never enough time to do the job right, but always enough time to do it over. :?:


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