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Old 04-12-2011, 10:08 AM
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Where to begin?

My stock 90 YJ (6 cyl - manual) needs some upgrades. I am thinking about a Motorcraft 2100 carb conversion, the Nutter bypass and more powerfull ignition. Please let me know your thoughts about what to tackle first and any suggestions or cautions on this endeavor. Thanks!

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Old 04-12-2011, 11:15 AM   #2
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Get the MC2100 carb and then do an HEI distributor ignition. The HEI makes the Nutter Bypass unneccessary and works as good (better from my experience) as other ignition upgrades and is MUCH simpler.

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Old 04-12-2011, 11:19 AM   #3
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Originally Posted by MellowYellow89YJ View Post
Get the MC2100 carb and then do an HEI distributor ignition. The HEI makes the Nutter Bypass unneccessary and works as good, if not better than other ignition upgrades and is MUCH simpler.
Could you elaborate a little more on what dist to buy and what is the application that you ask for and also is it a straight plug and play or is their other things that need to be changed or mods to go with it as well. Thanks any info is apprecited. Im also interested in more to know about rebuilding my carter-weber o-2731 thanks.

I also have 89 4.2l 5spd
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Old 04-12-2011, 09:46 PM
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Great - I ordered both the 2100 and the new distributor today - will send an update when the job is complete. Thanks!
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Old 04-15-2011, 09:16 AM   #5
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the nutter by pass is the best up grade you can do for your stock jeep for free
then a mc 2100 upgrade.
then the hei upgrade.
then by pass the frt diff. vacuum and lock in the axle full time.

AMC JEEP 232 258 4.0 4.2 6 CYL HEI DISTRIBUTOR 6511-R | eBay

if you need any help with any of the above call or email and i can send ya all the instructions for the mc2100 , nutter, frt diff. vacuum bypass
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Old 04-16-2011, 09:41 PM   #6
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for someone like me who has rebuilt my 90 4.2 jeep i went with the nutter bypass and replaced my pickup coil in distributor and replaced all spark wires and plugs and rotor and cap and the coil i went with a ACCEL 42000 volt and let me tell you for all that ignition stuff i bought it cost less than $80 (autozone) and my jeep is running spectacular.

Now this is with a MC2100 carb and all vacum lines removed except for 4wd and pcv and brake booster. Now i have been trying the jeep with and without the vacum advance on distributor and not really sure which one is better yet.
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Old 04-17-2011, 02:38 AM   #7
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The vacuum advance will just let you burn a bit cleaner during cruise and give you a slight mpg increase. My only problem with those ebay hei distributors is you buy them with having no clue what the advance curve in them is setup like.
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Old 04-17-2011, 07:23 AM   #8
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The vacuum advance will just let you burn a bit cleaner during cruise and give you a slight mpg increase. My only problem with those ebay hei distributors is you buy them with having no clue what the advance curve in them is setup like.
ok well good to know. Wasen't sure if it was worth useing or not. I have been having a little trouble getting it to idle right but it runs great and never stalls and you can punch it and it will just burn the tires but it idles alittle rough. Any idea's?
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1990 YJ Wrangler 4.2 Inline 6 bored 0.30 over MC2100, HEI

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Old 04-17-2011, 09:50 AM   #9
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Is the 93 the same as the 90 6cyl?
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Old 04-17-2011, 10:52 AM   #10
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no, 93 is a 4.0 and fuel injected. 90 is a carb'd 4.2. this stuff applies to the 4.2 jeeps
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Old 04-17-2011, 11:29 AM   #11
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Do some searching and research on the 4.0 head swap. Putting the 4.0 head on the 4.2 should add around 30-40 hp.
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Old 04-17-2011, 08:51 PM   #12
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Motorcraft 2150

I just installed a motorcraft 2150, 1.08 venturi, size 45 jets (I live at 4700 ft in elevation) It runs so awesome, I am so glad I did it. If you live at 4000 ft or higher go with the mc2150.
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Old 04-17-2011, 10:40 PM   #13
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I just installed a motorcraft 2150, 1.08 venturi, size 45 jets (I live at 4700 ft in elevation) It runs so awesome, I am so glad I did it. If you live at 4000 ft or higher go with the mc2150.
Agreed I got the 2150 and I'm at 5600 elevation, just havmt had time to install

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