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cup power loss
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- 5+ Years
- Posts: 8
- Joined: Sun Mar 05, 2017 8:39 pm
- Zip Code: 75681
- Tractors Owned: 2 Ford 5610 tractors
51 Farmall Cub
cup power loss
1951 cub - Starts quick but no power. As I release clutch the tractor stalls and dies. Sometime it will move but can't go up a slight incline. Would an improper point setting cause this? Thinking that a pertronix ignition might help. If not the point setting, what else could cause the cub to not have power?
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- 10+ Years
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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"
- Circle of Safety: Y
- Location: AL (Southwest)
Re: cup power loss
Suggest a valve adjustment, tune up to include a compression test and you'll know more about the condition of the engine.
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
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1970 International 140
1972 International 140
1949 John Deere A
1993 Ford 4630 W/Loader
1965 John Deere 110
1961 Cub Cadet Original - Circle of Safety: Y
Re: cup power loss
Get a timing light and check the timing as well as what Stan suggested.
Every home is a school, what are you teaching?
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- 10+ Years
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1951 Farmall Cub
1977 IH Cub
1966 IH Cub
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1949 Farmall Cub
Several IH 154 Lo Boys
1979 IH 184 Lo Boy
Simplicity 4416 Sovereign
Simplicity Conquest
Simplicity Legacy 4x4 Diesel
Mitsubishi MT180D 4x4 Diesel - Circle of Safety: Y
- Location: Grand Island, NY
Re: cup power loss
Cubs are pretty simple little engines, and extremely robust. I had one once, acting the same way. It had started and seemed to run perfect, but just no power. I started playing around with it and my dad came over with a pair of pliers and started pulling spark plug wires. We found out that it was only running on 3 cylinders, and in the process we had it running on 2 cylinders quite a bit. Surprisingly, it would sit there and run pretty darn good on 2 or 3 cylinders, enough that you wouldn't really notice it unless you paid close attention. Anyway, yours could be as simple as needing plugs and wires. However, as others have said, gunk in the valves, valves out of adjustment, and/or timing could all be issues too.
Cub Cadets 682, 1811, 1864, Simplicity Legacy XL 4x4 Diesel with FEL, 60" mower, 50" Tiller
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- 10+ Years
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Re: cup power loss
Also check that the governor is working correctly.
1975 cub (LouAnn) serial # 245946, 1941 John Deere Model H
Good judgment comes from experience,
and a lot of that comes from bad judgment. Will Rogers
Good judgment comes from experience,
and a lot of that comes from bad judgment. Will Rogers
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- Tractors Owned: 48 Farmall Cub "Seen Yore Dobbin"
53 F-Cub W/Loader. - Circle of Safety: Y
- Location: Michigan
Re: cup power loss
gitractorman wrote:Cubs are pretty simple little engines, and extremely robust. I had one once, acting the same way. It had started and seemed to run perfect, but just no power. I started playing around with it and my dad came over with a pair of pliers and started pulling spark plug wires. We found out that it was only running on 3 cylinders, and in the process we had it running on 2 cylinders quite a bit. Surprisingly, it would sit there and run pretty darn good on 2 or 3 cylinders, enough that you wouldn't really notice it unless you paid close attention. Anyway, yours could be as simple as needing plugs and wires. However, as others have said, gunk in the valves, valves out of adjustment, and/or timing could all be issues too.
Hard starting in the cold and sluggish power like not running on all cylinders inspired changing spark plugs on mine. Did not hear the difference,but with the muffler off while cranking it only seemed to " pop" black smoke on about one cylinder. Just faint grey vapor on the others.
Gapped the new ones at .23 ( as they should be), switched them out and checked gaps on old ones. ....They averaged .35. Tractor performs much better.
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1951 Farmall Cub - Chesty
Woods 59 belly mower
54A blade
1956 Gravely L
Dozer blade
Tiller
Rotary Plow - Circle of Safety: Y
- Location: Tallmadge, OH
Re: cup power loss
Mike in Louisiana wrote:Also check that the governor is working correctly.
I had a friend's Cub acting the same way, would start up and run nice but no power and it wouldn't take quick throttle changes. The only thing that changed from when it ran strong to when it was weak was I had the carb off to replace the manifold. Adjusted the linkage correctly and it ran strong again.
Luke Riddle
Tallmadge, Ohio
1951 Cub - Chesty
Tallmadge, Ohio
1951 Cub - Chesty
"You can't believe everything you read on the internet." - Abraham Lincoln
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- 5+ Years
- Posts: 8
- Joined: Sun Mar 05, 2017 8:39 pm
- Zip Code: 75681
- Tractors Owned: 2 Ford 5610 tractors
51 Farmall Cub
Re: cup power loss
I think I solved the problem by accident. Yesterday pulled all the plug wires off to check the plugs. Cleaned all of the plugs and put them back in the head. When I reconnected the plug wires, got plenty of power. Didn't check the plug wires before taking them off so my thinking is that I had a couple of them on the wrong spark plug. Thanks for all the replies. Ya'll all have a good weekend.
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- 5+ Years
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- Tractors Owned: 1948 Cub "Trusty"
1948 Cub "Rusty"
1948 Cub "Bob"
1948 Cub "Sallie" (wife's tractor)
1965 IH Cub "Annie"
1943 Farmall H
1953 Farmall Super M (granddad's tractor)
Re: cup power loss
Good deal. That's always a possibility
1948 Cub "Trusty"
1948 Cub "Rusty" mower tractor, trimmed ear dash
1948 Cub "Bob"
1948 Cub "Sallie"
1965 IH Cub "Annie" mower tractor,
1943 Farmall H,
1953 Farmall Super M
1948 Cub "Rusty" mower tractor, trimmed ear dash
1948 Cub "Bob"
1948 Cub "Sallie"
1965 IH Cub "Annie" mower tractor,
1943 Farmall H,
1953 Farmall Super M
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50 Farmall Cub bugeyes(dead)
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49 Ferguson TE20 Fergie
JD 790 4x4 w/backhoe
hinomoto diesel 4x4, early to mid 80s 20HP
73 Pasquali 4x4 diesel 33HP
74 Toro golf course tractor
Gilson 18HP - Circle of Safety: Y
- Location: Missouri Ozarks
Re: cup power loss
woot, great!! always nice to have a easy fix.
better to have it and not need it than to need it and not have it...( YES this includes CUBS! )
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- 5+ Years
- Posts: 4908
- Joined: Wed Nov 22, 2017 6:24 am
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- Tractors Owned: .
1970 International 140
1972 International 140
1949 John Deere A
1993 Ford 4630 W/Loader
1965 John Deere 110
1961 Cub Cadet Original - Circle of Safety: Y
Re: cup power loss
I put new plug wires on Walt a few years ago and mixed them up, it was running on 2 cylinders and had no power but it did run.
Every home is a school, what are you teaching?
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