D12 runnung rough

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   I have a 1960 (2464) D12 I'm trying to get running after many years of barn life.  It has several issues but thanks to some help from this forum it at least runs -- a little.
I have replaced the carb, plugs, plug wires, and coil. It starts with full choke and runs with the choke.  When I close the choke completely it runs fairly smoothly but at full throttle RPM with almost no throttle response.  I cannot get it to idle or even to slow.   I have tried adjusting the carb with almost no effect. I suppose I may have a bad carb (China).

I have not done anything to the governor, but I keep thinking it could be a source of this issue.

I would like to get it running smoothly before I move on to several other issues.  Any ideas?

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54f250 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 09 Dec 2022 Location: 47135 Points: 17	Post Options Post Reply Quote 54f250 Report Post Thanks(0) Quote Reply Topic: D12 runnung rough Posted: 18 hours 60 minutes ago at 7:23pm
	I have a 1960 (2464) D12 I'm trying to get running after many years of barn life. It has several issues but thanks to some help from this forum it at least runs -- a little. I have replaced the carb, plugs, plug wires, and coil. It starts with full choke and runs with the choke. When I close the choke completely it runs fairly smoothly but at full throttle RPM with almost no throttle response. I cannot get it to idle or even to slow. I have tried adjusting the carb with almost no effect. I suppose I may have a bad carb (China). I have not done anything to the governor, but I keep thinking it could be a source of this issue. I would like to get it running smoothly before I move on to several other issues. Any ideas?

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steve(ill) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 85418	Post Options Post Reply Quote steve(ill) Report Post Thanks(0) Quote Reply Posted: 17 hours 10 minutes ago at 9:13pm
	It starts with full choke and runs with the choke. When I close the choke completely it runs fairly smoothly but at full throttle RPM with almost no throttle response Should not need full choke to start... but if it does, you should be able to get choke 90% off within a few seconds... When you say CLOSE the CHOKE, is that 100% NO CHOKE.. Butterfly OPEN ?.... It would be hard to run WIDE OPEN unless your throttle rod / lever on the carb is fully stroked.. I would look at that to see the rod is not dragging on the engine block / etc... The LEVER on the carb should be down against the STOP.. and there is a STOP SCREW to adjust the low idle positon.. See that the lever is against the STOP and that the screw is backed out to get to LOW IDLE.... IF all that works, then we can get to the governor..
	Like them all, but love the "B"s.

steve(ill) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 85418	Post Options Post Reply Quote steve(ill) Report Post Thanks(0) Quote Reply Posted: 17 hours 5 minutes ago at 9:18pm
	BAck out the IDLE SCREW and make sure the THROTTLE ARM is down against the STOP to get to IDLE..... not your carb, but something like this.... if you have a mixture screw like the one at the top right of this picture, screw it in to the BOTTOM and back out 1.5 turns... i have a China Carb on one of my B tractors.. Starts and runs fine... but i had to remove the main jet and make it .002 inch bigger to keep it from hunting at 2/3 throttle. needed about 10% more gas.. Edited by steve(ill) - 16 hours 53 minutes ago at 9:30pm
	Like them all, but love the "B"s.

54f250 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 09 Dec 2022 Location: 47135 Points: 17	Post Options Post Reply Quote 54f250 Report Post Thanks(0) Quote Reply Posted: 9 hours 55 minutes ago at 4:28am
	Thanks for the quick response. When I say the throttle is closed I mean the butterfly is closed. I have tried adjusting the throttle set screw bit it does not seem to help. I also don't get much response from the idle or load adjust.

WF owner Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 May 2013 Location: Bombay NY Points: 4886	Post Options Post Reply Quote WF owner Report Post Thanks(0) Quote Reply Posted: 8 hours 9 minutes ago at 6:14am
	The first place I look on these old tractors is fuel flow. I drain the gas tank and remove the sediment bowl. Many (probably actually most) of the time, I find stuff plugging up the inlet to the sediment bowl. Remove the gas shutoff and thoroughly clean the inlet, outlet and screen in the sediment bowl. I can't explain why, but one of my tractors won't run right unless it has at least 5 gallons of gas in the tank. Any less, it spits and sputters. Lastly, check and make sure you don't have Champion spark plugs in it.

steve(ill) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 85418	Post Options Post Reply Quote steve(ill) Report Post Thanks(0) Quote Reply Posted: 5 hours 59 minutes ago at 8:24am
	there is NO WAY for the engine to go to high RPM without the THROTTLE PLATE OPENING... If you have the throttle arm on the carb down against the STOP SCREW and the SCREW is backed out far enough, the engine has to be a LOW RPM, unless the THROTTLE PLATE inside the carb has come off.. you may have the WRONG CARB... some are setup so you PUSH on the rod and the throttle plate opens, some are setup so you PULL the rod and the throttle plate opens... again, the plate has to be OPEN to get the motor to high RPM.. Edited by steve(ill) - 5 hours 56 minutes ago at 8:27am
	Like them all, but love the "B"s.

HudCo Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 29 Jan 2013 Location: Plymouth Utah Points: 3763	Post Options Post Reply Quote HudCo Report Post Thanks(0) Quote Reply Posted: 4 hours 27 minutes ago at 9:56am
	been siting for a few years ? if it does run decent ant the carb is clean and its getting fuel all four spark plugs firing ? if so better check to see iff all the valves are opening and closeing one stuck valve will make it run that way