Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Farmall & IHC Tractors Discussion Forum
:

superh too rich

Welcome Guest, Log in or Register
Author 
thirsty deere

08-13-2006 19:41:50




Report to Moderator

I've got a superh, with a carb that has a 350 bottom half with the supers top half. I can't get it to lean out. I've adjusted the float,have good spark and good compression. The choke is open and dosn't have a restriction is the oil bath and has clean oil. I can turn the power screw all the way in with no effect, and when I turn the mixture screw in it runs even richer. what can I do to lean it out? Does it have a jet that I can change? By the way it runs good but smokes black unless the gas tank is going dry then it clears up, so I think it is just getting to much fuel.

[Log in to Reply]   [No Email]
Andy Martin

08-14-2006 13:02:19




Report to Moderator
 Re: superh too rich in reply to thirsty deere, 08-13-2006 19:41:50  
By the way, the idle mixture screw is an air screw. Turn it out to lean the idle mixture. It lets air bleed into the idle circuit thereby leaning it out. Turning it in causes the circuit to bleed only fuel into the engine.

The other advice sure seems to be right on target.

It is possible, I guess, that the idle circuit is giving it way too much fuel.

Also, if the little brass tube which protrudes out of the lower body is broken off the engine can get too much fuel. I can't remember what part of the circuit it is, but I think it lets too much bypass.

[Log in to Reply]  [No Email]
RustyFarmall

08-14-2006 04:50:05




Report to Moderator
 Re: superh too rich in reply to thirsty deere, 08-13-2006 19:41:50  
It really makes no difference what the bottom half, or even the top half is from, as long as they both fit. It's the parts inside the carb that make the difference. Turning that load screw all the way in should completely block off the flow of fuel through the carburetor. I don't think dirt and crud in the carb would cause this problem. Either someone has abused this carb, or there is a crack down in the bottom of the fuel bowl which is allowing fuel to bypass the main load screw.

[Log in to Reply]  [No Email]
Bob M

08-14-2006 04:42:41




Report to Moderator
 Re: superh too rich in reply to thirsty deere, 08-13-2006 19:41:50  
Several possibilities:

1 – Float level is set too high.

2 - The tip of the power screw is worn or bent so it does not properly restrict gas flow into the metering orifice (seat). Or a wrong (too short) power screw is installed.

3 – The carb has a main metering seat for distillate/kerosene (389 784 R1) installed instead of for gasoline (358 085 R1).

Screwing the power screw all the way to the seat on a good carb should lean the mixture sufficiently to cause the engine to stumble and even stall when the throttle is suddenly opened.

[Log in to Reply]  [No Email]
CNKS

08-13-2006 19:54:39




Report to Moderator
 Re: superh too rich in reply to thirsty deere, 08-13-2006 19:41:50  
I agree with Old. Take it apart, soak it in carb cleaner and put a kit in it. I don't know if the SH/300/350 carbs are jetted differently, or anything else, I suppose they are. Rustyfarmall may be able to answer that.



[Log in to Reply]  [No Email]
CNKS

08-13-2006 19:56:08




Report to Moderator
 Re: superh too rich in reply to CNKS, 08-13-2006 19:54:39  
That's RustyFarmall with a capital F.



[Log in to Reply]  [No Email]
old

08-13-2006 19:47:07




Report to Moderator
 Re: superh too rich in reply to thirsty deere, 08-13-2006 19:41:50  
If you can turn the main jet adjustment in all the way and it doesn't kill the engine then you have a problem with the carb and have a clog some place.



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

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 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

Website Accessibility Policy