Stalls in third gear at high throttle

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Mht
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Zip Code: 27606
Tractors Owned: 1949 farmall cub(building from parts) 1950 farmall cub
1971 David Brown 880 selectamatic
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Stalls in third gear at high throttle

Postby Mht » Mon Oct 29, 2018 5:04 pm

My newly rebuilt 1950 cub stalls out at full throttle under load. At half throttle or less it does fine in all gears. At full throttle in third gear it stalls as soon as clutch is released. Carb has been rebuilt with parts from McDonald carb and float has been set according to specs and fuel level has been checked with clear tube. 6 volt magneto ignition with new points condenser rotor cap and wires. Static timed and tweaked to 13 degrees before tdc with timing light. What am I missing

k hutchins
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Zip Code: 48843
Tractors Owned: 1948 Farmall Cub
193 plow
1948 snow/grading blade
Woods 59 C3
Cub 144 cultivator
Cub 22 mower
Cub 172 one row planter
Original manuals for all the above

Re: Stalls in third gear at high throttle

Postby k hutchins » Mon Oct 29, 2018 6:19 pm

One thing to remember, the Cub is not a racecar. When taking off in 3rd gear you have feather the clutch out. Same thing in 2nd gear under load, or 1st if want keep the front end on the ground.
You can't let the clutch out the same way you would on a car or truck. The engine and govenor need time to catch up and balance.

Just my opinion after operating a Cub for 50 yrs.

Hutch
Why is there never enough time to do the job right, but always enough time to do it over. :?:

inairam
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Tractors Owned: 1948 with international 1000 loader 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 with c-2 mower & c-54 grader blade 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1975 with homemade mower 12 v - Horse
1979 long strip 12 v
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Re: Stalls in third gear at high throttle

Postby inairam » Tue Oct 30, 2018 5:55 am

did you check/ adjust the governor to carb linkage per the manual? Even if you do not change anything once you take off the carb it is a good idea to re-adjust the linkage.

Also, since the carb was off, make sure there are no air leaks between the carb and manifold.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Rick Spivey
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Re: Stalls in third gear at high throttle

Postby Rick Spivey » Tue Oct 30, 2018 6:09 am

Just one other possibility, one of mine was doing a similar thing. That was caused by a weak coil in the magneto. It had a spark, but a weak one, and it was really only noticeable under a heavy load. Once that was replaced, it would start in 3rd gear just fine, and even move the tractor in third gear at idle (once set in motion at a higher throttle setting).
Rick Spivey
'52 Cub ("Great Personality") 148xxx
'48 Cub with FH ("Gunny Cub") 38xxx
'57 Lambretta (a slow work in progress)
'74 Triumph TR6 (Mama's toy)

TallCoolOne58
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Tractors Owned: 1957 Farmall Cub
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Re: Stalls in third gear at high throttle

Postby TallCoolOne58 » Tue Oct 30, 2018 6:13 am

k hutchins wrote:One thing to remember, the Cub is not a racecar. When taking off in 3rd gear you have feather the clutch out. Same thing in 2nd gear under load, or 1st if want keep the front end on the ground.
You can't let the clutch out the same way you would on a car or truck. The engine and govenor need time to catch up and balance.

Just my opinion after operating a Cub for 50 yrs.

Hutch


I second that. The only time I use 3rd is on the road, from one property to another, and I will start off @ about 1/2-3/4 throttle, then accelerate to full throttle (high idle) once I am rolling.
Opportunity is missed by most people because it comes dressed in overalls and looks like work-Thomas Edison


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