ok, here's the deal..

My 87 Sammi (as a few of you know, I just picked it up, and been tinkering with it),

I installed a Weber 34 DGEC on it with standard jetting for the application... I am at 2860 feet of elevation here in Central Oregon... Also, have a very "free flowing" stock exaust system (orriginal pipe, no cat, and big ole cherry bomb for a muffler).... I did not take that into consideration.

the install went good, as weber conversions usually do..once I figured out the how to plug ALL THOSE EXTRA VACUME LINEs.....  but, the carb is too rich..

Also, per the spec.. the way to adjust for best performance is to adjust the idle MIX screw in and out till the idle changes (drops off and runs ruff....)...well...there starts the issue... when adjusting the idle screw, about 3 turns from being bottomed out, the idle gets good.....so, I found the front end of the range, now, adjusting it in more, I find that I can't get the silly thing in far enough for the idle to 'drop off" on the other side...


SO... I went with webers suggestion of compensation for Altitude, decreased the size of the main and idle jets (by a value of .005) , and increased the size of the air jets.. (by a value of .010)

I got those bad boys in and waaaaaaaaahooooo!   The monster is  waking up..... Runs so much better, no more of that annoying fire coming out the tail pipe, exaust is smelling much better, not that unused gas smell..... But, at highway speeds, it still has a bit of that running to rich Cough... other than that, things are good

BUT, now for my idle mix screw adjustment....I play with my adjustment screw and I have even less of a range... now, from about 1.5 turns until bottom out, is were the thing starts to run smooth....back that bad boy out all the way (till it falls out, and things don't change) turn it in, thin is rough, till right at 1.5 turns from bottom, then runs smooth..

I am thinking of changing Jet sizes one more time (decreasing main and idle jets .005, and increasing the air by .010), but am afraid that I will loose this little sweet spot...? 

Does anyone know anything about the needle valve, I see online that they (weber) offers several sizes of needle vavles, but don't know if I should try changing that at the same time, what it would do to my range (increase or decrease), or even what size comes standard.. I pulled the thing out (see above) and looked, cannot find any indication of size....

Any ideas??

Thanks for taking the time to read this article...didn't know how else to esplain things.!

Mark