Well I found this thread
http://www.peachparts.com/shopforum/showthread.php?threadid=92607&perpage=15&highlight=weber&pagenumber=2
[QUOTE]As Chuck said, Charlie is right about the transistorized system - but - it is over 30 years old. Now, my perspective (or history) with my '71 250C.
First thing I did was rebuild the Zeinth carbs, replace dizzy cap, points, rotor, plugs, plug wires, fuel pump and filters. Car ran OK but had all of the things you are talking about plus surged at highway speeds, long cold and hot starts and mileage was 10-11. Checked the coil and it was not within specs so I replaced it with a new Bosch blue coil. Car ran better - surged less at highway speeds but still not good. Replaced the Zeinth carbs with Webers and had them jetted locally by a Weber person. Much better but still not as I would have thought it to be. Mileage went to 12-13, surge at highway speeds was gone. Still rich, hesitation at start up, once in a while a backfire, rough idle now and then, hot starts still took a while, etc. Threw out the Bosch plugs and went with NGK (advice from Weber guy who just happened to be Japanese - yes we laughed about that). Made a difference. Better cold start, better idle. Still not what I wanted.
I wired the ignition around the transistor box and the hot start probem got better but overall running was off so I went back to the transistor box. Then I put the Crane XR700 and a Crane coil on and viola!! Cold start was fine, hot start (restart) problem went away, idle smoothed out, hesitation on startup was gone and the over-rich condition went away (except at idle). I opened the plug gap to .040. Mileage went to 14-15. I got 16.5 on two trips to Springfield. Weber guy told me that the rich idle with the dual Webers on my setup was just the "nature of the beast" so I never worried about it.
Now, to be totally fair here, I did scrap all of my "smog" stuff, plumbed the vacuum advance direct to the front Weber, disconnected the retard vacuum and set the initial ignition advance to 10 degrees Before. The car ran in that configuration for 5 1/2 years. Oh, the Webers did not use the fuel return so that line was capped.
My opinion is (or was) - and I could be way off base here - that the original ignition system was 30 years old and was not up to what it should have been. Plus I had to "assume" there was wear-and-tear in the dizzy also and that the Crane optical unit offset some/most/any of that wear-and-tear. I know I could have had the dizzy rebuilt but since I had no desire to maintain a totally stock MB and the thought of never having to either mess with points or ignition timing again pushed me to the Crane. For me it was a decision that I will never regret except that I should have done it when I did the Webers.
Your desires and situation may be different - but I did want you do know what I did with my 250C to solve my problems and irritations.
Good Luck.
Dan
QUOTE]
So maybe converting to a CRANE is what I need to do? I'll try some NGK's in the short run and see if that helps at all. I have a new coil and new dizzy as Dan puts it.. I guess perhaps my jets are too big as well.. who knows .. can anyone reccomend a weber guy in Los Angeles? If I can't figure this out soon I may have to put my Zeniths back in
