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Old 05-19-2009, 04:53 PM   #1
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quick carb question

I used the search function and looked up carb issues for my 89 4.2 5sp. from the results i couldn't figure out whether or not trying to rebuild the original and replace the vaccume lines was recommended or if i should just replace the carb with a weber.
just looking for some advice/thoughts. thanks

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Old 05-19-2009, 05:38 PM   #2
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I have an 89 YJ 4.2 5spd and I replaced the carb with an original rebuilt with no problems. It runs great. Over the years I have replaced some of the vacuum lines. I know you'll here that you should replace it with a weber or other aftermarket carbs which might not be a bad idea, especially if you off-road. Since I really don't, the original is fine.

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Old 05-19-2009, 05:54 PM   #3
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thanks kik. it's my only wheels at the moment i am not doing much off-road. much appreciated.
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Old 05-19-2009, 06:14 PM   #4
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long run ide go with a weber. My experience is they are easy to tune and hold a tune pretty good. If your just putting around your DD check pricing for rebuilt compaired to new weber and rebuild kit and decide what you are most comfortable doing. You have some choices atleast which is better than some other cars where there are no rebuild kits and no aftermarket.
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Old 05-19-2009, 06:34 PM   #5
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thanks dooder.....appreciate the thoughts and ideas. definately nice to have options.
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Old 05-19-2009, 06:53 PM   #6
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If you decide to go with an original rebuilt I can recommend a carb shop in NJ that does a great job and they are very knowledgeable with YJ's.
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Old 05-19-2009, 09:54 PM   #7
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Do a Google search, & a board search at http://www.jeepsunlimited.com
for MC2100. This carb, along with the Nutter bypass & the "TeamRush Ignition upgrade" make for a fine running4.2L!
I-6 'TeamRush Upgrade' (definitive) - JeepForum.com
This is a Picture Guide to Nutter Bypass - JeepForum.com
YJ motorcraft 2100 swap problems, need help/local shop - North Carolina 4x4 Forum
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Old 05-20-2009, 06:38 AM   #8
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y'all rock. i can't say thanks enough
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Old 05-20-2009, 06:55 AM   #9
that's what she said

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i would recommend upgrading to the weber. i had a carter carb on my cj and that carb was nothing but problems from day 1. weber is a better carb and upgrading should save you time and money in the long run.
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Old 05-21-2009, 12:12 AM   #10
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I have the MC2100 carb upgrade. I was so close to getting the weber I just could not afford it at the time. I found the MC2100 option last minute and have been so pleased. It fixed all my problems of bogging down on hills and poor idle and everything. I did find a melted or rotted vac line once I gutted it all out I suspect that might have been my main problem with the carter carb I had. I did the nutter bypass it is super ez not complicated when I get home this time i plan on doing the team rush upgrade again that looks like simple plug and play stuff and not to hard on the wallet. You will find either option works well. I figure most folks go with the first one they tried and not the other. Biggest upside to the weber is it is new ready to go out of the box. the MC2100 you can buy used and rebuild it (supposedly easy I have never rebuilt a carb) or do what I did which was buy from that guy on schmeebay just search for jeep carbs he should pop up. either option I figure is better than what is in there which is a spaghetti mix of vac lines and such it looks nightmarish.
Good luck,
Bern
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Old 05-21-2009, 04:54 AM   #11
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Quote:
Originally Posted by bernm8r View Post
I have the MC2100 carb upgrade. I was so close to getting the weber I just could not afford it at the time. I found the MC2100 option last minute and have been so pleased. It fixed all my problems of bogging down on hills and poor idle and everything. I did find a melted or rotted vac line once I gutted it all out I suspect that might have been my main problem with the carter carb I had. I did the nutter bypass it is super ez not complicated when I get home this time i plan on doing the team rush upgrade again that looks like simple plug and play stuff and not to hard on the wallet. You will find either option works well. I figure most folks go with the first one they tried and not the other. Biggest upside to the weber is it is new ready to go out of the box. the MC2100 you can buy used and rebuild it (supposedly easy I have never rebuilt a carb) or do what I did which was buy from that guy on schmeebay just search for jeep carbs he should pop up. either option I figure is better than what is in there which is a spaghetti mix of vac lines and such it looks nightmarish.
Good luck,
Bern
The MC2100 is an easy rebuild. I just did mine for the second time. When I got it, that rebuild was the first carb rebuild I ever did.

Nice thing about doing the rebuild yourself, instead of E-bay is you can rebuild it yourself from then on.

If you think the TeamRush is expensive, the wait till you next tune up. That's basically all this mod is. (A Tune-up)

Do use the Napa parts, as they have brass cap pins instead of aluminum. Much better!

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