primarily carb set ups

[Jon_P]

ok have my carbs all cleaned and back together. i would normally set it all up the way i took it apart except in this case. when i was breaking it down i found the P.O. had taken a bunch like 5-6 small washers and black rtv them to the needle under the cur clip. i cant remember where i want to start. to i start with the clip on the top setting and work down? or work up?

what is the stock main jet size? have to double check and see what i have.

[Bob_Roller]

You need to get the numbers off of the carbs, there is a vertical web cast into the front of the carb body, and it will have numbers stamped in it like : 64/32/325. Post those numbers, one from each carb, and when I get home in about 5 hours, I can look it up in the Bing manual I got about a month ago.

[Jon_P]

cool!

64/32/204 is the right carb

64/32/203 is the left carb

ok bob now i need to know where can i get my hands on a Bing manual? never have to many books!

[Bob_Roller]

I got mine from the Bing Agency, in Council Groves, Kansas, for about $10. There is a wealth of info in the 20-30 page manual, most of it probably not of much use to the average BMW owner, but more trouble shooting info than I have ever seen for these carbs.

[Bob_Roller]

Jon, the number for the main jet is :140 and the clip position for jet needle is number 2 and this is numbered from the top. Just to confirm that you have a flat top carb. There's a few other numbers listed, for other parts inside the carb if you would be interested in those as well.

[Jon_P]

so my main jet should be a size 140? have to go double check that. thanks.

[Jon_P]

ok i have 140 mains, where should i start the idle jet at? i have it at one full turn out, to little? to much to start?

thanks

[Bob_Roller]

Idle mixture is 1/2 turn out, the idle speed adjustment calls for 3/4  turn, for the initial adjustment.

[Jon_P]

thanks bob!

i need to get me one of those books for sure now.

[MrRiden]

Just thought I'd throw this in for balancing. I love mine! I balance at idle & again at 3K
Rich
http://www.powerchutes.com/manometer.asp

[Jon_P]

i made one of those! they are great, i also found a set of liquid filled gauges that i hooked some tubes to use, my friend at the shop has a fancy $1k for doing all kinds of carbs and efi. i can get mine as close as that.

[Ed Miller]

I have to re-do mine.  It touched an exhaust pipe.   :-/

[Jon_P]

ok what am i doing wrong? i rebuilt the carbs, they are clean! i put them back together like the books say to. i set the float like the book said, set the needle and idle jet and idle as instructed. it turn over fine. the carb tubes are off so i can see and hit it with a little gas, which it runs great on till it runs out of the sprayed in gas. so i have spark and compression but i believe my fuel/air mix is all wrong or not working at all.

where do i start?

i have the needle at the second setting from the top, started with the idle jet at 1/2 turn out then 1 turn out. idle set one turn. it acting like its not getting any fuel.

[Bob_Roller]

How are you setting the idle speed adjustment ? I put a thin feeler gauge ( .002 in. or .003 in.) between the adjustment screw and the throttle lever and turn the screw until it just pinches the feeler gauge, then 3/4 turn in. You may have to turn it in more for your bike. Try 1 1/2 turns to see if it helps. Also the cables for the throttle need to be slack. Tighten the 'choke' cables to where they would be normally and put the 'choke' on to get a richer mixture to help it fire.

[Jon_P]

first let me say i am all mixed up.

i went back and reread through the book and this thread. i have confussed the idle jet and the mixture adjust screw. i think i need to open the bowls up and then back the idle jet back the half turn. that should make things better.

i am done trying today. going to spend the night with the family instead of the bike, i have tomorrow!!