Yesterday's Tractor Co. Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Farmall & IHC Tractors Discussion Forum
Order Farmall Cub Parts Online

Cub still not running well...

Welcome Guest, Log in or Register
Author  [Modern View]

11-01-2012 13:49:47

Report to Moderator

Thanks for the several suggestions on how to fix the old Cub. Here"s what I have done. Recall it was running fine until taken to a shop to replace a busted throwout bearing. Since returning it doesn"t run well enough to be used for anything:

1. Pulled and inspected the plugs - all had a grayish deposit around the electrode, but looked clean, dry, and free of oil. The distributor cap and rotor are new as are all the plug wires. The coil, points and both condensors were replaced with the plugs last Spring and it ran fine through the summer.

2. Verified firing order as 1,3,4,2 with 1 being at the 1:00 position looking at the distributor

3. Pulled the carb apart and inspected it. No dirt in the inlet screen and nothing observed inside. Cleaned with some spray carb cleaner to verify openings were clear. Loosened the main metering jet from outside and verified fuel is flowing out the drip hole.

4. Checked the air cleaner, which was a little low on oil but otherwise OK.

5. Started and observed that after warming up a bit it will run very smoothly, but only at a low idle. Advancing the throttle immediately results in (brrp brrp pop pop brrp) missing and poor running, almost killing the engine. Advancing slowly seems to allow it to speed up better, but still seems to miss a bit periodically or a lot under even a light load.

6. Adjustments to the idle screw have little effect, so I left it about 1 1/2 turns unscrewed.

7. Pulled the sediment bowl and everything appears clean. Reinstalled it and opened the valve, and pulled the fuel line off the carb and verified fuel runs freely through the hose.

Could this be a problem with the governor? Is there an advance mechanism in that housing? This has a 12v conversion and I have never touched the timing or opened the governor in 20 years...just set point gaps by feeler gauge when doing a tune up. It almost always is used at just about full throttle and had been running well this summer, with an occasional stumble when pulling a load and turning uphill while the regulator catches up. I appreciate the advice as it is not usable at the moment.

[Log in to Reply]   [No Email]
Brett Helmkamp

11-02-2012 11:03:52

Report to Moderator
 Re: Cub still not running well... in reply to Beargap, 11-01-2012 13:49:47  
Did you try turning dist to advance timing? Spark plugs can make a huge difference. Keep away from the Champions anymore. Maybe the timing is just off a little. Just a thought

[Log in to Reply]  [No Email]

11-01-2012 17:41:35

Report to Moderator
 Re: Cub still not running well... in reply to Beargap, 11-01-2012 13:49:47  
BIL has a little ford and it was doing the same thing and we changed the condenser and it runs like a top. The condenser that we took out was brand new and the one we put in to make it run right was used.


[Log in to Reply]  [No Email]

11-01-2012 19:07:04

Report to Moderator
 Re: Cub still not running well... in reply to S2710, 11-01-2012 17:41:35  
Ya now days I do point an plugs but I do not replace the condenser since you stand a 75% chance a new condenser is going to be bad or only last a short time

[Log in to Reply]  [No Email]

11-01-2012 14:50:54

Report to Moderator
 Re: Cub still not running well... in reply to Beargap, 11-01-2012 13:49:47  
Make sure you have a good blue/white spark at all plugs that will jump a 1/4 inch gap or more. Next pull the carb drain plug and make sure you have a good steady flow of gas for a few minutes. Catch to look for water/dirt etc. Next since this is a cub and most likely does not have an adjustable main jet pull the cap off that covers the main jet and make sure you have a good steady flow of gas there. Any of all of those can cause that long with what Glen said

[Log in to Reply]  [No Email]

11-01-2012 14:23:15

Report to Moderator
 Re: Cub still not running well... in reply to Beargap, 11-01-2012 13:49:47  
if it just had a throw out bearing put in, then it was probably split to do it. i'd would re-check all the wiring to see if something is pulled loose or pinched, especially from the ignition switch to the coil. if its a 12v, check the ballast resistor for damage. also check the distributor where the small wire from the coil goes thru the housing to the points. there is a little bakelite type grommet in there, and if its cracked, it could be shorting out. i am leaning toward an ignition/electrical problem. posibly condenser or coil. also, check the distributor shaft for side to side movement, it may have worn bushings in there. rotate the engine till the points close, then wiggle shaft side to side to see if there is enough slop to vary the point gap.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums

Copyright © 1997-2018 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters