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Old 02-06-2014, 12:45 PM   #1 (permalink)
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My '87 Samurai has a newly rebuilt engine with a Weber 32/36 carb conversion. (I am not a fan of this carb from experience with it on other vehicles). It runs smooth and quite well 1-4 gears. In 5th gear it does great until about 55 mph/3000 rpm then it just quits accelerating-no sputter or issuing as if fuel starved it just will not go any faster or above 3000 rpm. (In 1-4 it will go to 4000+ rpm). I have adjusted the carb, set the timing at 10* BTDC with no vacuum. Valves were set at rebuild which was 100 mis. ago. any suggestions as to what might be causing the problem?
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Old 02-06-2014, 07:30 PM   #2 (permalink)
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What size tires are you running? you might just not have the power for any more speed. I can only hit about 48mph on 31" tall tires.
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Old 02-06-2014, 07:50 PM   #3 (permalink)
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Was the stop bolt for the throttle linkage (inside firewall) removed when the Weber was installed? If not, you won't be getting full throttle throw at the carb linkage. As asked above, what size tires are you running?
What did the new engine consist of? New cam and rockers, or, just reusing the old ones? What parts were replaced during the rebuild and do you have any specs for what was done (decked block, shaved head, turned crank, bored out, pistons, cam specs, etc.)?
3000 rpm is about the downshift point, for a stock 1.3, unless you run a different from stock camshaft.
These little engines are much happier in the higher rmp ranges.
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Old 02-07-2014, 08:55 AM   #4 (permalink)
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Tire size is probably somewhat of a factor: 205/70 R15. Not only would that affect rear wheel power but tach and speedometer reading somewhat. I presume that you are talking about the gas pedal stop underneath the pedal. I will remove that and see if there is any improvement. I have also cruised prior threads which indicate that speed wise 55-65 is about top for a 1300 in stock configuration. Future plans include CV carb. conversion and header-both already on their way to me. One of my sons is a diesel guy and has been doing TDI conversions in Samurais, that is a thought. I am still researching potential engine swaps. This is my first Samurai. I have hit 60+ on the down hill and with stock suspension that is interesting in this thing. I do a car a year getting to old and broke to keep it up-this may be the last one but I have said that so often my kids just roll their eyes and wait to see what i drag home next.

1987 Samurai pretty much stock
1974 Toyota FJ40, 350 with an over/underdrive. (Done a 100 in that one-scary.)
1948 Ford F1 1/2 ton-dynoed 413 rearwheel hp and 438 foot #s torque 6 psd auto. (Done 140 in that one.)
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Old 02-07-2014, 10:01 AM   #5 (permalink)
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I have been trying to get a cheap harley carb to start the CV swap. I hear its a big improvement.
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Old 02-07-2014, 11:46 AM   #6 (permalink)
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I already have a 40mm Kehin, (Japanese not Chinese) that the person I got my Samurai gave me that he modified to work with the common adapter. I am also contemplating the 44mm. I will have it done in the next 30 days and will let you know. The carb is only a part of the improvement: more air in means more air needs to get out so headers and pipes will make it even better. More power equals more heat and other things to consider. Keep in mind-cheap is cheap, Chinese knockoffs are cheap-I learn this lesson over and over.
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Old 02-07-2014, 03:45 PM   #7 (permalink)
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I just swapped in a E fan I got on ebay took that fan off the motor seems to lighten up the motor alittle.
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Old 02-07-2014, 08:35 PM   #8 (permalink)
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It' hard to tell the experience level of posters on here, after only one post.
You don't seem to be a beginner and already know how to turn a wrench.
I found the tube header and 2" exhaust opened up the breathing quite nicely for the Weber. I used the long tube Pacesetter. For some reason, they make one of the tubes in two pieces, with a slip joint. The rattle will drive you nuts! I took it off and welded the joint. No problems so far, after two years. I didn't think I needed more top end on a motor that will turn 6k +, on stock carb and exhaust, so, I went for the long tube, over the other short tubes available.
On my 1.3 rebuild, I stepped up the exhaust valve size to the 1.6 size and went with the Isky low end cam. BIG difference in the bottom end torque. It pulls all the way down to 2000 rpm. Much less time spent rowing the stick, looking for the right gear. There looks to be enough meat around the valve seats to go bigger on the intakes, too (next time).
It turned the little guy into a real truck motor. I also changed out the pistons for some flat tops. I had to send the first set back, because the pin to top height was going to put them too far out of the hole. The block had to be decked .009, to flatten it out. The next set of pistons had .015 shaved off the top and made me a little more comfortable with the end compression ratio. I can still run regular unleaded. It kept it a non interference valve train (Play Dough test), which is nice with the rubber band timing belt. There's lots of clearance in the head on these little guys. It will also run freeway speeds, with 215/75/15 tires (I have the later model 5spd, with the lower 5th gear). A little busy under the hood at 70 ~ 75mph, and a head wind is your enemy, but doable. I'm at 5000 ft elevation, so, I think sea level would be very driveable. No overheating problems, even when I took it to Tucson, on a summer day. If, I drive it nice, I can squeeze 23mpg out of it, Hwy and city.
I almost got by w/o turning the crank. Just on the high side of meeting stock clearances, if we had decided to polish it out. Same with the bores. Clean up and hone would have been iffy. We settled for .50 mm overbore. Motor had about 130k miles on it.
I've only had my 71 FJ40 up to about 75. Stock 1 F motor and 4.11 gears is pushing it at that. The stock worm and sector steering, with center arm, drag link and relay rod, doesn't help much , either. Steers worse than my 01 Dodge Cummins, even after all new tie rods, steering gear rebuild and knuckle bearings. What can you expect from a 60+ year old design?
Other toys? Well, my favorite right now is an 01 Audi TT Quattro roadster. As soon as I can keep it from overboosting and going into limp mode, I'll let you know how fast it goes.
As far as the most fun for the buck: The Samurai can't be beat.

Last edited by Azelgin; 02-07-2014 at 08:42 PM.
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