1948 cub is hard to start

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.
Richard in Ga
Posts: 14
Joined: Tue Jul 07, 2020 7:07 pm
Zip Code: 31636
Tractors Owned: farmall cub
140 farmall

1948 cub is hard to start

Postby Richard in Ga » Sat Aug 29, 2020 2:29 pm

48 cub is hard to start. A complete tune up has been done. The valves adjusted. Carb has been rebuilt and it still is hard to start. When it does start it runs good.
Any ideas?

indy61
10+ Years
10+ Years
Posts: 1277
Joined: Fri Jan 25, 2008 9:02 am
Zip Code: 00000
Circle of Safety: Y

Re: 1948 cub is hard to start

Postby indy61 » Sat Aug 29, 2020 2:40 pm

My first guess is points gap is off.
Is the Cub still magneto and 6 volt?

Richard in Ga
Posts: 14
Joined: Tue Jul 07, 2020 7:07 pm
Zip Code: 31636
Tractors Owned: farmall cub
140 farmall

Re: 1948 cub is hard to start

Postby Richard in Ga » Sat Aug 29, 2020 2:47 pm

No magneto and its is 6 volt
Also the coil is new

User avatar
lowgearfarm
Cub Star
Cub Star
Posts: 56
Joined: Sat Apr 06, 2019 9:01 am
Zip Code: 03227
Tractors Owned: '49 Farmall Cub
'83 Kubota B7100
Location: Sandwich, NH

Re: 1948 cub is hard to start

Postby lowgearfarm » Sat Aug 29, 2020 2:47 pm

Richard, check the simple things first. Crank it several times. If it doesn't start, pull the plugs. If the plugs are wet, then you flooded it. If the plugs are dry, then it's not getting gas. Report back to this forum in the morning with what your plugs are telling you.

Waif
5+ Years
5+ Years
Posts: 1052
Joined: Thu Aug 25, 2016 1:29 pm
Zip Code: 49343
Tractors Owned: 48 Farmall Cub "Seen Yore Dobbin"
53 F-Cub W/Loader.
Circle of Safety: Y
Location: Michigan

Re: 1948 cub is hard to start

Postby Waif » Sat Aug 29, 2020 2:53 pm

Double check sparkplug gaps.
.023.

And points gap.
For magneto system , .013 point gap. Battery type ignition , .020 point gap.

Have you found the "sweet spot" on your throttle lever for starting yet?
And are you familiar with how much choke it wants for starting , if any?

When a carb is removed and replaced , there are adjustments to follow.
Both the governor linkage(s) , and air/idle mix screw.
After checking to be sure choke lever is installed securely and in the proper position.

Richard in Ga
Posts: 14
Joined: Tue Jul 07, 2020 7:07 pm
Zip Code: 31636
Tractors Owned: farmall cub
140 farmall

Re: 1948 cub is hard to start

Postby Richard in Ga » Sat Aug 29, 2020 3:06 pm

Adjustments are good.
Runs great its just a pain to start, hot or cold

Richard in Ga
Posts: 14
Joined: Tue Jul 07, 2020 7:07 pm
Zip Code: 31636
Tractors Owned: farmall cub
140 farmall

Re: 1948 cub is hard to start

Postby Richard in Ga » Sat Aug 29, 2020 3:06 pm

I'll double check all the gaps

indy61
10+ Years
10+ Years
Posts: 1277
Joined: Fri Jan 25, 2008 9:02 am
Zip Code: 00000
Circle of Safety: Y

Re: 1948 cub is hard to start

Postby indy61 » Sat Aug 29, 2020 3:16 pm

Do you feel like it's cranking fast enough?
Bad battery cables/ends can make a huge difference.

Richard in Ga
Posts: 14
Joined: Tue Jul 07, 2020 7:07 pm
Zip Code: 31636
Tractors Owned: farmall cub
140 farmall

Re: 1948 cub is hard to start

Postby Richard in Ga » Sat Aug 29, 2020 4:22 pm

Cranking with hand crank.
Starter is being rebuilt

indy61
10+ Years
10+ Years
Posts: 1277
Joined: Fri Jan 25, 2008 9:02 am
Zip Code: 00000
Circle of Safety: Y

Re: 1948 cub is hard to start

Postby indy61 » Sat Aug 29, 2020 4:51 pm

Hand cranking with distributor ignition requires a good battery. Voltage should be around 6.5 or more with a 6 volt.

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 19545
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: 1948 cub is hard to start

Postby Eugene » Sat Aug 29, 2020 5:18 pm

What did you do for a complete tune up? Explain.

Static time and then timing light time the ignition?

Spark plug wires on correct spark plugs? Tractor will run on 2 cylinders.

It will take about 4 to 4.5 battery volts to fire the spark plugs.
I have an excuse. CRS.

Richard in Ga
Posts: 14
Joined: Tue Jul 07, 2020 7:07 pm
Zip Code: 31636
Tractors Owned: farmall cub
140 farmall

Re: 1948 cub is hard to start

Postby Richard in Ga » Sat Aug 29, 2020 5:52 pm

Points, cap, rotor, wires, plugs and coil are new.
New battery and new battery cables.
I am going to check all the gaps again maybe the starter will be back by then and it will spin it faster than i can turn by hand.
I have been starting this cub by hand since I was a teenager but it sat idle for a long time and now i am trying to bring it back. It used to start a lot easier. Could it be the plugs need to be hotter?
Ps i did static time it earlier

Richard in Ga
Posts: 14
Joined: Tue Jul 07, 2020 7:07 pm
Zip Code: 31636
Tractors Owned: farmall cub
140 farmall

Re: 1948 cub is hard to start

Postby Richard in Ga » Sat Aug 29, 2020 5:54 pm

battery maintainer says i have about 6.8 volts

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 19545
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: 1948 cub is hard to start

Postby Eugene » Sat Aug 29, 2020 5:58 pm

All that's nice, but you didn't answer my questions.

By the way. No need to "spin" the engine over when hand starting.
I have an excuse. CRS.

Clemsonfor
501 Club
501 Club
Posts: 834
Joined: Sun Nov 10, 2019 5:14 pm
Zip Code: 29848
Tractors Owned: Yanmar YM2000
Yanmar YM186 (non running)
1952 Farmall Cub
Circle of Safety: Y
Location: Greenwood County SC

Re: 1948 cub is hard to start

Postby Clemsonfor » Sat Aug 29, 2020 7:49 pm

indy61 wrote:Hand cranking with distributor ignition requires a good battery. Voltage should be around 6.5 or more with a 6 volt.

Mine fires with less than that. 5.5 volts or lower.


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: No registered users and 3 guests