[AJD] What a day - Galloping idle - Backfires

[LeRoy Price]

Duane,

What I noticed as I listen to it run it periodically runs smooth as I adjust it.  When I get it to that point and let it be, in a few moments its searching again, then smooths out again.  I'm adjusting at low idle.

I opened the distributor and I had small filings on the top of the cover (over the points).  I even noticed that the posts in the cover had some plastic backing which is now cracked away.  Not sure if this means anything.

Today, I did start my 40S and it runs fine.  I may use the plugs out of it and change the gas and see if that helps.

LeRoy
 

> 
> From: "Duane Larson" <jdlarson at comcast.net>
> Date: 2005/05/30 Mon PM 11:47:41 EDT
> To: "Antique John Deere mailing list"
> 	<antique-johndeere at lists.antique-tractor.com>
> Subject: Re: [AJD] What a day - Galloping idle - Backfires
> 
> LeRoy,
> A couple of thoughts.  Just driving around with your 40W will not cause the 
> load circuit to play a significant role as most fuel will be drawn through 
> the idle circuit.  The idle adjustment is located just below the flange 
> where it is bolted on.  Remember that the idle needle controls the air, not 
> the fuel, so turning it in makes the idle mixture richer.  The load needle 
> can  best be adjusted when the tractor is under load, and Bob did that when 
> running your carb on his test engine.  He also set the idle needle at that 
> time.  Default settings are 2 turns out for both idle and load.  You can 
> simulate a load condition by running the engine wide open, adjusting the 
> load needle till it runs smoothly, then opening it another 1/2 turn, but 
> that should be close to Bob's setting.
> 
> You might also adjust the idle stop screw if it is searching at idle - turn 
> the screw in against the stop pin until it runs smoothly.
> 
> Finally, you might also check the rod from the governor to the carb linkage 
> for proper length.  Disconnect the linkage at the carb, push the throttle 
> lever to the wide open position, hold the carb throttle shaft in the wide 
> open position, adjust the rod length until the rod just slips in the carb 
> throttle shaft, then shorten the rod two turns at the ball joint and insert 
> the rod in the carb throttle shaft.
> 
> As noted elsewhere, fresh fuel and plugs are also good.
> Regards,
> Duane Larson
> 
> ----- Original Message ----- 
> From: "LeRoy Price" <lep at epix.net>
> To: "Antique John Deere mailinglist" 
> <antique-johndeere at lists.antique-tractor.com>
> Sent: Monday, May 30, 2005 6:11 PM
> Subject: [AJD] What a day - Galloping idle - Backfires
> 
> 
> >
> > Guys,
> >
> > Well the plan was to get the tractors running today and a thunder shower 
> > stopped me at 6Pm.  Anyway, I did get to start and rung the JD BO.  It ran 
> > well.
> >
> > I then got my stuff together in a wheel barrow and off to the field I went 
> > (tools, 3 batteries, gas can, a carb and the mag).  Thats where I have the 
> > tractors under tarps.
> >
> > I just got my JD 40W carb back from a Robert's rebuild, looked nice.  But 
> > before getting into the JD 40 I went I figured I better start with the 
> > Ferguson 40.  Got the mice nest out, popped in the battery, a little gas 
> > and it started after about 3 trys.  I drove it around a bit and then 
> > parked it and let it run.
> >
> > Soooo, while that was running I uncovered the JD 40W and started to put 
> > the carb on.  Got it on without issue but will need a new gas line, leaks 
> > near the bowl.  Put some gas in it and started it.  It started on the 2 
> > try and ran pretty good so I drove it around.  What I noticed was a little 
> > gallop in the idle.  So I got out the manual and started tweeking, noting 
> > where it had been set.  The interesting thing is that no matter where I 
> > adjusted the load needle I couldn't hear a difference in the idle.  After 
> > about 15 minutes of tweeking I had this thing back firing like nuts. 
> > Haven't a clue why and was wondering if someone could help.  It seems that 
> > when the throttle was on full open the idle seemed to gallop and soon 
> > after it backfired.  I adjusted and adjusted but it wouldn't change.  So I 
> > tried to get back to the settings it had when I started.   I restarted it 
> > and it seemed to be better but its still sort of gallops.  By gallop I 
> > mean it runs and then there seems to be a!
> >  pause and then it picks up again.  When it picks up thats when it 
> > backfired.
> >
> > Any ideas?
> >
> > LeRoy
> >
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