Re: Weber Carb K551 - Survey
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