When I let the clutch out it stalls

[deves3000gt]

like nabrams suggested check the valves and compresstion.

and as for the sub post my gs 750 is a dream to start. the bike even done some serious parked time and even then put ckoke on start bike even after the longest parked time 2-3 years it doenst completely turn over 3-4 times befor it starts. now that it is mine (i start it more then my father did) it starts immediately, choke for a min maybe two and good to go. but, i belive that your bike is normale also. just one of those gs things hu?

[GooberPea]

Hi all, it's my first post. Great community here. I just inherited an '81 GS850G from my dad. He was kind enough to crash it before he gave it to me :-) Anyway, this is my first time fixing a bike and I too had a problem with the bike stalling as soon as I was letting the clutch out. It seems the reason was because I had the petcock in the "prime" position. I switched it to "on" and the problem went away. I understand the basic concept of priming, but I'm such a noob I don't know if it should kill the engine when I engage the clutch and try to move. All I can say is that seems to be what "fixed" my problem.

[rphillips]

Is this what caused you cleaned the carbs? or was it running ok & started this after cleaning the carbs???