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49 Farmall Cub

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kscott49
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49 Farmall Cub

Postby kscott49 » Fri Aug 12, 2016 3:39 pm

I have recently picked up a 49 Farmall Cub from my uncle. Have found a few items in need of repair, carb clean out and rotor/distributor look worn. In taking the rotor off the pinion I failed to pay close enough attention to the placement and did not get it back onto the pinion correctly. I had not seen this type of rotor before and was somewhat taken aback as the kit I purchased at a local farm store that showed to be pre - 56 models was not the correct part. Is there a way to match these up without re-timing the motor?

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mva1958
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Re: 49 Farmall Cub

Postby mva1958 » Fri Aug 12, 2016 5:31 pm

Hi, and welcome. You most likely have a J4 Magneto ignition system, which is different from the battery ignition system that your rotor kit from the store fits.

See this for a quick how-to on timing the magneto rotor/pinion gear on your mag distributor: viewtopic.php?f=140&t=83108

There's a good video on YouTube that details how to static time the mag. If you want to replace the points/condenser, the gap for the mag system is .13

The proper manual and a bunch of other useful info is available from the "PDF Manuals" section, look at the top of this page for a link.
If only Mrs. Hoyt and Mrs. Clagwell had gotten along...

staninlowerAL
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Tractors Owned: Cubs: (3)'49's, (1 is for parts), (1)'57 IH Cub LoBoy w/FH, (2)154 Number Series Loboys, (1 is for parts), '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '47 & '49 Avery V, '53 MM BG (offset), '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76? Yanmar 2TR15 1500 & Bush Hog SQ42S-2 mower, '78? FORD Dexta, '86 FORD LGT14D & 48" Mower, (2)Cub Cadets & Mowers (MTD), (4) Sears Surburban's, other MTD mowers, Jeeps & other misc. "treasures"
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Re: 49 Farmall Cub

Postby staninlowerAL » Fri Aug 12, 2016 5:57 pm

mva1958 wrote:Hi, and welcome. You most likely have a J4 Magneto ignition system, which is different from the battery ignition system that your rotor kit from the store fits.

See this for a quick how-to on timing the magneto rotor/pinion gear on your mag distributor: viewtopic.php?f=140&t=83108

There's a good video on YouTube that details how to static time the mag. If you want to replace the points/condenser, the gap for the mag system is .13

The proper manual and a bunch of other useful info is available from the "PDF Manuals" section, look at the top of this page for a link.

TYPO, the correct point gap is .013, we all make'um. Stan
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)

Jim Becker
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Re: 49 Farmall Cub

Postby Jim Becker » Fri Aug 12, 2016 7:26 pm

The short answer on replacing the rotor, assuming you have not removed/moved the main body of the magneto:

The rotor has a rib opposite the metal tip. The pinion has one tooth with a clipped corner. The rib needs to align with the clipped tooth. Since the rotor is twice the size of the pinion, that can be 2 different ways. Put it back one way. If the tractor won't start, reinstall the rotor 1/2 turn from where it was.

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mva1958
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Re: 49 Farmall Cub

Postby mva1958 » Sat Aug 13, 2016 8:18 am

staninlowerAL wrote:TYPO, the correct point gap is .013, we all make'um. Stan


I stand corrected. Dew knot trussed yore spelt chequer two fined awl missed steaks.....
If only Mrs. Hoyt and Mrs. Clagwell had gotten along...

kscott49
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Re: 49 Farmall Cub

Postby kscott49 » Mon Aug 15, 2016 8:36 am

Appreciate all the advice. I will try your suggestions this weekend.


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