Weber Carb K551 - Survey

Ok... here is my own answers and comments to the survey:

1) Currently at 520RPMs. Why? Weber told me to set it at 400 to 500. I think this is too low and this is one reason I started the survey.
2) Exactly 2 turns in after contact. Again Weber said not to turn it in more that 2 turns or I am exposing my progression port. At 2 turns I get 520RPMs
3) 2.25 turns out. Weber said make sure between 1.5 and 2.5.
4) I had to jump up 2 idle jet sizes to the 85. Why? Back to Weber saying not to turn idle speed screw in more than 2 turns. With the stock idle jet and set at exactly 2 turns in on the idle speed screw then my idle was only 400RPMs. Way to low to me.
5) I set it to 1500 if engine is warm. When engine is cold it goes to about 1300 and slowly increases until I take choke off.
6) When I had the choke original set at 1800RPMS I could tap the pedal and it would drop to about 1300 and then tap again and it would drop to base idle. Now that I have choke set to 1500 I tap the pedal once and it drops to base idle.
7) My EGR is not connected at this time. I plan to connect it to the Weber EGR Port.
8)Vacuum advance is currently connected to Weber Port. Why? Just followed insturctions.
9)Currently using stock distributor with Accel coil. Changing over to HEI soon.
10) 5BDTC at 1600RPMs with no vacuum advance connected.
11) Automatic
12) No... however looking to do this based on a couple of other Jeepers recommendations.
13) Yes after a day or more it takes quite a few turn overs to fire up engine due to gas draining back. Haven't fixed it yet.
14) I am not sure due to tire size and speedometer being off, but my best calculation is about 13.5MPG
15) 33x12.5 Tires

Thanks again for your time.

OK Greg, here's my answers (at least the ones I know!)
1. App. 700
2. ? I didn't even bother to look. Just hooked up a tach and got the idle I wanted.
3. 3 1/2
4. No
5. App. 1600
6. Drops to base idle
7. No
8. Left it just as it was, manifold.
9. Stock
10. Manual
11. Napa regulator set at 2 1/2 lbs.
12. I think this may be an evaporation problem. Since I started parking in the garage, it is not a problem.
13. Who cares, can't do much about it anyway and I like the way it runs!
14. 33x12.50
Hope this helps.

Brad (from the 4 Wheeling center of the universe, 4 corners USA)

Figured I better resond too...
1) 700 RPM
2) Set it and forgot it.
3) About 3 1/2, until the motor ran smooth w/no sudden shakes
4) No
5) Right about 1500 RPM
6) Falls right back to base idle
7) Not using the EGR
8) Vacuum advance connected to carb
9) Stock Dist/Ign (Going to Jacobs shortly to try it out)
10) 5 degrees/vac disconn
10) Manual tranny
11) Yes, have Balkamp fuel press reg at 2.5 lbs (thanks to Brad)
12) Yes, must go thru about 4 starts to get it to fire.
Planning on disconnecting the fuel return.
13) Was getting about 12, now I think it's slightly better, but, who cares...
When it runs outta gas I put more in....
14) 35 x 12.5


CJ8George
o[[[[o
85 CJ8,258,Weber32/36,4" BDS lift,4.10,35"tires,f/r lockers

I have one, but I am going to use your survey to review my setup for accuracy, I'll be glad to let you know what I find, but it will be a week or two, weather permitting. So far, I need to look at the Vacumn advance and the egr connections. For the record, I am using the HEI, no fuel pressure regulator. The other settings are a vague memory, plus, they may have changed when a mechanic buddy got this setup to pass the sniffer/emisions test for North Carolina. /wwwthreads_images/icons/wink.gif

Hey Greg,
Well here is the deal with my Weber experience. I also have an 89 YJ w/ 258 auto trans. I was tired of the "cold start" performance of the BBD, but after the motor warmed up it ran pretty good with the stock carb. I decided to try the Weber K551, bought the kit from Leon Rosser for about $326. if I remember.
Got the kit a few days later and installed it. Took me most of the day because I also got rid of any useless vac lines, wiring and pulse air sys. I pretty much just took out the "rats nest" sitting on my engine, I can acually see the engine now! Well the install went pretty good, had to play around with the linkage a little and re-set the timing(already had HEI). Adjusted the carb to lean best setting and went for a little test ride. First off, I noticed the really LOUD air intake noise with the K&N that annoyed the hell out of me!Then the jeep fell flat on its face at anything over half throttle.... real bad hesitation and bog. As the engine warmed up it got a little better, but still very noticable(I couldnt even pull out into traffic)! Drove it around for a week hoping to "break it in" and try to adjust it more. Still no better after a week so I called Worldpac (Weber Redline). The guy on the tech line was really no help at all. He was pretty much just reading the instructions as he told me what to "try". He promised to send some jetting parts.....2 weeks later and no "next day air" parts I called him back. This time on the cell phone so I could tinker while he was on the line. I even took him for a ride while we were on the phone so he could here the "bog". Again he promised to send some parts and a Weber manual..... overnight. 2 weeks later after no parts in the mail, I called Leon Rosser and kind of demanded they take the carb back! After some talking with a few people they agreed to refund me! One girl I talked to said they were having "quite a few problems with the Webers"
To answer your questions the best I can remember...... My idle was set about 800 rpms out of gear and droped down to 600rpms in gear. Mixture setting was 2 - 2 1/2 turns out. Fast idle I set to 1500-1600 rpms, dont remember how it kicked down. I played with the timing quite a bit.....mostly because of the HEI. I just set it as advanced as possible so that it didnt "ping". I think that I am at 5-6 deg btdc at idle rpm, with vac advance plugged. With the Stock carb back on ,computer bypassed and HEI, it runs great when warm, but still has the "cold Start" Prob. No "bog" with the old stock carb....only with the new Weber. I May try a "pre-computer" BBD for a 1980 CJ-7 auto 258 or I may try EFI, prob The Howell TBI set-up.....$1000..Ouch.
Just so you Know, The tech reps at Worldpac(Weber) will try to tell you you have your timing is not set corectly and you have some sort of vac. leaks on your engine! Thats there way out of the phone call. Why did the old carb run fine with my vac leaks and timing way off I asked them........no answer! I talked to a few people on this BB who had the same prob. Most everybody I talked to had some sort of "bog" prob and set up troubles!
Sorry for the long winded post but I thought you would like to know that your not the only one who has had probs with the Weber!
P.S.......Still waiting for those "overnight" parts....6 months later ;-).
If you need any more help, let me know.......Herbie

Herbie,

Thanks for the reply. I am not really having bog down problems or anything indicating a problem other than not getting the RPM's required at 2 turns or less... as Weber says I need to do. The engine runs smooth, no hesitation, no surges, no sputtering (unless I run out of gas). If you have followed all my posts you will probably remember me saying the Weber Tech guy said that my idle needed to be 500. Just about everyone else online has it at 700 or better. I received another email from Bud at Weber and he said that it should be around 700. (MAN WHO DO YOU BELIEVE).

Herbie, I too have been told I must have a vacuum leak or timing problem. Everything has been checked and there are no vacuum leaks. All new hoses in the whole system. One suggestion is I have blow back or a valve leak. I will be trying to double check the compression test this weekend (weather permitting).

I finally recieved another email back from Bud at Weber. The only suggestions given until this last email from him was to look at the lean best idle instructions. I have done that a dozen times already!!! It doesn't change anything. Anyway, he has added a few suggestions this time that I am going to try. Also, another Jeeper sent me a note on how to check something else.

I will continue to follow up with the progress as time permits. Also I hope to get a few more survey results in.

Oh.. from what several other jeepers have told me you should have been able to get that Weber working great (if tech support would have been helpful). I think Weber has a great product when things are set correctly and when you receive the appropriate technical support. This is an example of how a good company can make itself look very, very bad.

Thanks again.