MC2100 carb/choke troubles -

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post #1 of 3 Old 11-18-2014, 10:43 AM Thread Starter
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1986 CJ7 
Join Date: Apr 2013
Location: Marquette
Posts: 182
MC2100 carb/choke troubles

I have a 1986 CJ7 with a 1971 258 motor and a MC2100 carb. Last summer I replaced the electric choke and it seems to function properly. In good conditions (above 30 degrees), it seems to work quite good. Lately, the jeep has started to give me trouble. The butterfly in the carb seems to get stuck in a mostly closed position. The jeep stalls a lot, and when it runs it wont give me any power. The only way to fix it is to remove the air cleaner and push the butterfly open with my finger. There is some resistance, but not a lot and it feels like it snaps open. After that it starts and runs normally. Ive checked the linkages and pivot points on the butterfly and choke and everything is clean. There is no one in my area that will work on carbs, and I really don't think it needs a rebuild. Has any one else had these issues?

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post #2 of 3 Old 11-18-2014, 10:50 AM
Mike Romain
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1986 CJ7 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant
Posts: 18,089
The pivot rod that comes out the back of the electric choke unit seizes up easily. This is the rod that goes from the bimetal spring inside out to the choke linkages. Penetrating oil can loosen it, but I find taking it apart and adding a bit of anti-seize keeps it free.

86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: (10 new albums added Sept 16/10)
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post #3 of 3 Old 11-18-2014, 11:16 AM
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1979 CJ7 
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Location: Dayton, Ohio
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I just got done putting a hedder and replaced my MC 1.08 with the MC 1.21. It is 15 degrees and I didn't even use the choke to start mine.
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