jonnys95s10

Thanks that helped I see now what the problem is. When I put the carb on I had the fast idle adjustment like it showed in the diagram on the rebuild kit and how it was before cleaning on the first notch of the cam. Every time I rev up it stops at a different notch or doesn't even make it to the notches. I checked the throttle it seems free and returns and the cable has a slight amount of slack. The spring has tension sometimes it works sometimes it doesn't. One the first notch adjusting the mixture it idles 2000-2500rpm if it stops before it even makes contact with a notch I can get a decent idle at 1000rpm. I try any lower and it gets rough.

It's not the accelerator pump spring I got it new with the kit. It's a small spring about 1/8" in dia. and 3/8" long although the pen spring was closer to a 1/2" long. It item 59 on this diagram http://www.olddatsuns.com/data/Hitachi_Carb_DCH_DCP_DRJ340.pdf.

I picked up a 76 620 a few months ago. I was having problems with it dying or having a rough idle when I came to a stop. I decided to rebuild the carb while I had it in the garage redoing the brakes. Now it might die or get a idle at 1000rpm-2500rpm different everytime. I was going to try and adjust it but not sure where to start since it's all over the place. I did loose a spring out of it held down a ball bearing replaced it with the spring from a ink pen. I can't be sure but it seemed to have enough force to act the same plus it was the only thing I could fit in the hole. I guess next time I won't work next to a gravel driveway.