Carburetor Central
If you have questions about the SU Carburetors, this is where you can find the answers.
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Color Tune?
by m240- 3 replies
- 2.2k views
I just "refreshed" the carbs on my 71' engine with a VB kit and it runs better than it ever did since I got it, but it seams to be running rich. It flooded out once and did not want to restart and I get some grayish / black smoke out of the tailpipe. I was thinking of getting one of those Color Tune tools to help dial things in better. Has anyone used this before and what do you think of it? Also the head pipe from the rear three cylinders glows red hot above idle while the front head pipe looks normal. Is this a normal thing? I balanced the carbs with a syncrotester and thought that both pipes should look the same. Thanks again for any help or suggestions!
Last reply by justaZcarguy, -
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- 3 replies
- 1.6k views
Hello all, Have just replaced my carbs with Ztherapy ones and have noticed that the carbs drain fuel over a couple of days and when I start the car I have to wait for the fuel system to refill. I guess I have a leak and intend to put some newspaper under the carbs after starting the car from cold and then shutting off. if there are blotches on the paper then I guess I have found the leak. However I was wondering if there is something else I need to check - fuel return system perhaps? Cheers Glenn
Last reply by justaZcarguy, -
- 0 replies
- 1.7k views
I really need some information on the web regarding Mikuni tuning and maintence, assembly bla, bla, bla... Any suggestions? Every search that I do I come up with plenty of cycle stuff but very little triple info.... Thanks and have a great weekend!!!
Last reply by justaZcarguy, -
- 0 replies
- 1.6k views
Someone here just asked me if one can use the Alfa GTV 2.5 V6 webers that were on the early pre-injection model ? Thumbs up or down Hey Guus, do you have pictures also of the Zs up there that run a diesel and the other on GPL ?
Last reply by Sean Dezart, -
- 12 replies
- 3.5k views
Has anyone in OZ got a good 240z air cleaner assy for sale, my carb's are round top 3 screw type .I dont think 4 screw type carbs are any different mounting wise { not positive on that }. Roger Salisbury Nth Adelaide South Australia
Last reply by Rogersz, -
- 0 replies
- 1.6k views
Hey (again), Onto the '74. Those of you that are running triple carbs or have this knowledge I need some help... The triple mikunis are currently being run from the stock electric fuel pump. Is this enough? I would venture to say no and I need to look into another if necessary... I have been advised on the carter inline pump for around $60. Ideas? thanks!!!!!
Last reply by justaZcarguy, -
- 0 replies
- 2k views
Ok, two questions, finally I put a center force clutch in the '74 and now that I can actually drive the damn thing I have a question regarding the triple Mikuni set up that I have.... And curse the 500 mile break in on the clutch, that is gonna take forever...:tapemouth Anyway, I need to know how to tell the mm size on the carbs and what I need to do regarding a fuel pump to supply the beasts... Currently I have put in a stock 240 electric fuel pump I had laying around, but I don't think that's gonna do it... Any advice? Thanks! ~Brian
Last reply by justaZcarguy, -
- 1 reply
- 1.8k views
I am having trouble starting my 72 240 in the morning. I was working on the SU’s and noticed that the choke linkage was loose. When the choke is pulled back the jet’s are not dropping. How do I tighten this up so the choke operates correctly. Also the jet’s are turning instead of droping.
Last reply by onemore240, -
- 7 replies
- 2.3k views
Hello, when i first got my car it was only runnin on the first three cylinders... then i let it run for a bit since it hasnt' ran in like 3 years stuck some rislone in the crank case and soem other stuff to "clean" out the engine-well whatever it does. I noticed this week that it ocasionally want's to run on three when i start it up..so i started wiggling things around the carburetors..Underneath where the adjusting nuts and all that stuff is on the back three cylinder where it isn't running when i start it it's all loose and ****. you can wiggle it easily. IT was also kinda sticky. where the choke and all that stuff was... what do i need to do? I think a rebuild is probr…
Last reply by ZmeFly, -
- 2 replies
- 1.7k views
Was walking downtown and saw an old BMW R 90/6 parked at the curb. It is, of course an opposed moter and had a carb on each side (fed from the crankcase???) that said Bing. They looked like simple, clean little units. They looked so simple, they could almost pass for throttle bodies. Anyone give me more info on these? Of course, it is impossible for me to see something like this and not imagine them in a row of 6...... steve77
Last reply by biker, -
- 4 replies
- 2.1k views
The 1973 240 I bought has triple webers but their chokes(starter devices) are not hooked up. Does anyone have any advice on how to fabricate some linkage for these? I live in a fairly cool climate, so I assume I will need a functional choke. Am rebuilding the engine, so I haven't started the engine yet to see how these carbs perform. Thanks. ps. I don't know how I put this question under k2chronics name. Somehow I must have been logged in under his name. Whatever I did, it was accidental. Sorry.
Last reply by tanny, -
- 0 replies
- 2.2k views
I've seen a handful of people both at the classic datsun show and elsewhere who either did not have or did not use the supplied fuel line for their triple set-up. This is the one that looks just about identical to the stock one, ie with the fuel return line..... These people have the fuel coming from the tank to the fuel pressure regulator and then usually via stainless steel lines and AN fittings to the the carbs with no provision for a return. Why? What does this change? nothing I am guessing.... Did they just plug up the return to the gas tank? Am curious to hear what you all have to say... -e
Last reply by EricB,
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