1963 Cub Engine RPM's

The Cub Club -- Questions and answers to all of your Cub related issues.
Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
Masmith
10+ Years
10+ Years
Posts: 106
Joined: Sun Dec 06, 2009 10:55 pm
Zip Code: 40165
Tractors Owned: 1957 Cub, 1958 International Lo Boy, 1961 Cub, 1962 LoBoy,
Location: Shepherdsville, KY

1963 Cub Engine RPM's

Postby Masmith » Fri Mar 06, 2020 12:27 pm

I just bought a tractor back that I previously owned and know the history of recent maintenance. It runs very good but the engine RPM's seen low at full throttle. It has a 42 mower and cuts good, doesn't bog down, so I think the governor is working as it should. Before I start messing with adjustments I was hoping someone could possibly point me in the right direction. My thoughts are the throttle linkage is not adjusted properly? With the tractor running at full throttle, I can move the governor linkage back by hand and it revs up very nice.
Attachments
IMG_0527.JPG
Mike

Masmith
10+ Years
10+ Years
Posts: 106
Joined: Sun Dec 06, 2009 10:55 pm
Zip Code: 40165
Tractors Owned: 1957 Cub, 1958 International Lo Boy, 1961 Cub, 1962 LoBoy,
Location: Shepherdsville, KY

Re: 1963 Cub Engine RPM's

Postby Masmith » Fri Mar 06, 2020 1:15 pm

I saw this response in another posting. I will try to adjust the maximum speed stop screw.


The maximum engine speed is limited by a stop screw on the arm where the speed lever rod attaches to the governor. Once you hit the stop screw you cannot move the lever any farther forward.
Mike

User avatar
Don McCombs
Team Cub Mentor
Team Cub Mentor
Posts: 16241
Joined: Mon Feb 03, 2003 6:45 am
Zip Code: 21550
Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
Circle of Safety: Y
Location: MD, Deep Creek Lake

Re: 1963 Cub Engine RPM's

Postby Don McCombs » Fri Mar 06, 2020 1:22 pm

You might also lubricate all of the governor linkages and see if that produces any improvement.
Don McCombs
MD, Deep Creek Lake

Image
Proud Member of Maryland Chapter 39
Circle of Safety

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 19593
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: 1963 Cub Engine RPM's

Postby Eugene » Fri Mar 06, 2020 3:34 pm

I would check the ignition timing and full throttle RPMs before I made any mechanical adjustments.

Timing light with tach.
I have an excuse. CRS.

User avatar
Glen
10+ Years
10+ Years
Posts: 5396
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: 1963 Cub Engine RPM's

Postby Glen » Fri Mar 06, 2020 7:40 pm

Hi,
The full speed for a 1963 Cub is 2000 RPM.
I would use an automotive test tachometer to set the RPM.

You can set the low RPM when you use the tach also. It is 500 RPM.
A tach with a dial and pointer works better for a Cub, I think they have said on here.

Below is a pic from TM Tractor of the governor housing, showing the high speed adjustment bolt, at the top of the governor, it usually has to have the amount of bolt sticking up above the lock nut as in the pic.

The 2nd pic shows the linkage at the governor. Lube the pivot where the cotter key is with oil, they can get tight there from no lube. :)
Attachments
Cub gov 2.jpg
Cub gov 4.jpg

inairam
5+ Years
5+ Years
Posts: 2283
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 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 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
1975 with woods 42-6 12 v - Horse
1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: 1963 Cub Engine RPM's

Postby inairam » Sat Mar 07, 2020 7:34 am

It is almost never the governer itself. I would go over the linkage between the governor and the carb and adjustment on the carb 2 or 3 times before I would mess with the governor setting. You probably do want to replace the governor spring.

lube the linage connections, trim cotter pins to an appropriate length so they do not catch on something and cause a bind, adjust the linkage per the manual, adjust the carb per the manual.
When you only have 9 horsepower you need to know the names of all of the ponies!

outdoors4evr
10+ Years
10+ Years
Posts: 2664
Joined: Tue Jul 22, 2008 12:44 pm
Zip Code: 48370
Tractors Owned: 184
Location: Oxford, MI

Re: 1963 Cub Engine RPM's

Postby outdoors4evr » Mon Mar 09, 2020 7:33 am

I use a mechanical tachometer like this one on the PTO.
https://www.ebay.com/p/1833653069

Some timing lights also have an RPM readout.
184 w/ Creeper & 3-Point
IH 3160a Mower
IH Model 15 Tiller
IH-54 Blade


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: Jackman and 2 guests