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Old 11-14-2014, 05:04 AM   #1 (permalink)
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Default Carb issues in cold

Ok, I have an 86 samurai and I just had an engine replacement and got one from a salvage place. I asked for the whole setup carb, intake and exhaust manifolds, flywheel etc.. so I could just drop it in and be done before the cold hit us here in Kansas. Well, needless to say it did this week. The first thing I had was that I got it in started it and it ran good and kept running better. From there about 10 mins into running it I noticed the carb was pouring fuel from the front after everything warmed up. I started looking for a place to rebuild this one and obviously no one wants to. Well from there I checked the screws holding the top and bottom half together and they were really loose loose. I tightened them and leak issues were gone. Anyways now that it is cold when I start it after sitting a few hours I have to baby the throttle to keep it running. after a few minutes it runs perfect. I also have another issue where the alternator is not charging battery due to the radio, etc.. that will be fixed this week. I was a diesel technician for a while but, I do not know anything about carbs at all.I replaced the fuel filter as well to rule out fuel problem and it helped a lot but I still have the issue of having to baby the gas. What could be the issue at hand? I am not looking to replace it fully unless there is a good carb I can get that will allow me to go up to the mountains in Colorado without adjustments on the carb and allow me to climb steep hills. Weber is also out of the question for swap as I have disliked them for years.
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Old 11-14-2014, 08:21 AM   #2 (permalink)
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Quote:
Originally Posted by digidoggie18 View Post
Ok, I have an 86 samurai and I just had an engine replacement and got one from a salvage place. I asked for the whole setup carb, intake and exhaust manifolds, flywheel etc.. so I could just drop it in and be done before the cold hit us here in Kansas. Well, needless to say it did this week. The first thing I had was that I got it in started it and it ran good and kept running better. From there about 10 mins into running it I noticed the carb was pouring fuel from the front after everything warmed up. I started looking for a place to rebuild this one and obviously no one wants to. Well from there I checked the screws holding the top and bottom half together and they were really loose loose. I tightened them and leak issues were gone. Anyways now that it is cold when I start it after sitting a few hours I have to baby the throttle to keep it running. after a few minutes it runs perfect. I also have another issue where the alternator is not charging battery due to the radio, etc.. that will be fixed this week. I was a diesel technician for a while but, I do not know anything about carbs at all.I replaced the fuel filter as well to rule out fuel problem and it helped a lot but I still have the issue of having to baby the gas. What could be the issue at hand? I am not looking to replace it fully unless there is a good carb I can get that will allow me to go up to the mountains in Colorado without adjustments on the carb and allow me to climb steep hills. Weber is also out of the question for swap as I have disliked them for years.
I put the My=Side 2 and a Harley 44 carb on mine. The Sami starts and runs great. More power and climbs like a mad dog.
Mike
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Old 11-14-2014, 10:30 AM   #3 (permalink)
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I have heard good things about the HD conversion but I do believe that the OEM carb should work adequately for now. Based on what you described I would check to make sure the choke is closed when cold and gradually opens as it reaches operating temperature. The cold stumbling can be a few different things but that it runs well after warm suggests maybe the choke is staying open while cold.
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Old 11-14-2014, 11:07 AM   #4 (permalink)
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I have heard good things about the HD conversion but I do believe that the OEM carb should work adequately for now. Based on what you described I would check to make sure the choke is closed when cold and gradually opens as it reaches operating temperature. The cold stumbling can be a few different things but that it runs well after warm suggests maybe the choke is staying open while cold.
The choke would be flap on the passenger side? if so it stays open the whole time although I do have a new update. This is the first time I have had it running for like 3 or 4 hours and after it warms up the idle jumps between 1000 and 1500 rpm tries to die then moves the idle up then realizes its high and lets it drop back down and when you give it gas it hesitates and stumbles. What is the good and bad you have heard abotu the conversion. I also have a second carb but it appears to be a different style. If I were to do a conversion it has to be able to go from 2k ft above sea level all the way up to 10,000ft above sea level as I do a lot of wheeling that high up. is that possible without having to re-jet?
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Old 11-14-2014, 02:59 PM   #5 (permalink)
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There are a few different things with carbs that can go wrong generally speaking, it makes it hard to Dx without putting hands on it. My carb experience has been with Holley, Dellorto and Webber and they were all finicky as hell so someone that has been playing with the Samurai setup might do better with some ideas to help you right now.

This might not help you today but wondering if a TBI conversion would make sense on the 1.3 if robbed from an 8v sidekick, or even the whole 1.6L TBI motor which is cheap and straight forward. A nice engine swap that has been done and documented to death here and other Suzy boards. As far as just taking the TBI for the 1.3, not sure if it's an easy conversion or not.

When I toured by motorcycle (recovered HD rider here) I had some difficulty going over passes with any of the 3 HDs I had so not sure how well the HD carb conversion will work at altitude. You cant take to much power away from an already anemic machine. I switched to an EFI Triumph triple and never looked back. Carbs need to go the way of the kick start, washboards and 8 track players. My sami has the 16v EFI and its drivability is splendid and never misses a beat, well worth the work involved IMHO. I have noticed a handful of TBI conversion jobs on other types of off road vehicles so it can sure be done. I'm not aware of any other carbs that will take that much altitude without at least notable power loss.
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Old 11-14-2014, 03:06 PM   #6 (permalink)
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I just bought a used 1.3l to put into it because I bought it with a jacked up engine back in august. the previous owner let oil get low and devlop a rod knock then tried to sell it to me for 1500 saying it was because the vacuum advance wasn't working. As soon as I heard the old engine fire up I knew right away what was going on and talked him way down in price. I will eventually do EFI as well just not right now at the moment. I need it driveable for the winter at the moment. Unfortunately I cann't find anyone with a kit to do the EFI besides one place and they were talking like 1200 for it.
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Old 11-14-2014, 03:08 PM   #7 (permalink)
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As for the 1.6 swap that will hopefully come later. I have been thinking about it dues to the lack of power however I heard that some swaps need the special tube header, 2.0 requires massive fabrication and alteration, etc..
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