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Old 01-25-2010, 11:02 PM   #1
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Tuning a carb on an 86 sami

My samurai seems to be running rough i think the tuning on it is out. I have a feeling that the a/r is to lean and the ideal screw is turned up to make up for is. what is the best way to go about fixing this problem.
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Old 01-25-2010, 11:34 PM   #2
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Check timing, check for vacuum leaks (most common problem) verify that the choke is fully closed. Get it down to proper idle RPM, drill out or tap out the rod that is covering the idle mixture jet needle. Remove the air intake to the top of the carb so you can hear the air. (the following is what I do since I don't have a exhaust sniffer) I back the screw all the way off then screw it in till I hear a difference on the idle and air going through the venturi then I back it off one revolution. More than likely though it is a vacuum leake somewhere.
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Old 01-25-2010, 11:39 PM   #3
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the mixture screw is tapped already. the timing is spot on and the hoses are all connected
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Old 01-26-2010, 01:22 AM   #4
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Remove carb from intake and throw carb as far as you can. Remove intake and send to MY for the core for an MS2 intake. Forget about finding a used HD carb unless you know some one with a known good carb, other wise just get a new carb.


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Old 01-26-2010, 09:55 AM   #5
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Remove carb from intake and throw carb as far as you can. Remove intake and send to MY for the core for an MS2 intake. Forget about finding a used HD carb unless you know some one with a known good carb, other wise just get a new carb.


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the stock carb sucks for making HP, the weber sucks for wheeling, I like the 4 carb setup because the stock manifold was desighned to not work and I'm not a fan of anything that keeps it in use. But thats my opinion and alot of people really like the myside setup.
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Old 01-26-2010, 12:32 PM   #6
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only problem with the MS2 is that he is in California and still has to deal with the smog nazis.
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Old 01-26-2010, 02:24 PM   #7
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only problem with the MS2 is that he is in California and still has to deal with the smog nazis.

you might also want to check your egr system, take it off and give it a good cleaning ...... and chances are if you are going to have to mess with the mixer screw to get it to run right he is already screwed with the smog nazis those carb are great when they are brand new but put some years on them and they become almost impossible to get right again
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Old 01-26-2010, 09:51 PM   #8
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ya i got it passed smog it just seems like the mixture went wacked lately. Also when i floor it and let off the throttle takes like 3 secs before the rpms fall
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Old 01-26-2010, 10:16 PM   #9
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Check the direction of the diaphrams in the vacuum lines. Sounds like one maybe backwards or a line is hooked up wrong on the drivers side of the carb.
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Old 02-01-2010, 08:19 PM   #10
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Finally found the problem but now i gotta adjust the idle and air fuel ration. The vacum line to the bottom of the intake tube was not attached. The thing it connects to in the intake had fallen out into the air box. runs alot smoother but still rough
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