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D12 runnung rough
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54f250 View Drop Down
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Joined: 09 Dec 2022
Location: 47135
Points: 14 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 54f250 Quote  Post ReplyReply Direct Link To This Post Topic: D12 runnung rough
    Posted: 8 hours 18 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) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 85399 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 6 hours 28 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.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 85399 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 6 hours 23 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) - 6 hours 11 minutes ago at 9:30pm
Like them all, but love the "B"s.
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