Sean,

One thing I forgot to mention is that the low needle can play havoc with the high end. If you can, try to back the low needle out enough that you have to have a fairly high idle to stay running. Then adjust the high end for peak and back off a 1/4 turn. Now go back to the low end again and use the old tried and true method of pinching the fuel line to set it. As you go leaner, you will need to reduce the trim on the xmitter to keep the speed down. If you pinch the fuel line for a second and the engine speeds up, turn the low needle 1/8 turn leaner and run the engine back up. Bring it back down and repeat. Every quarter turn of the low speed needle, go back high throttle and peak the high speed needle and back off a quarter turn. Keep doing this until the engine does not speed up when you pinch the line anymore, but starts to slow or die. At this point open the idle needle 1/8 turn and run up to high speed. Lower it back down and check. What you want is for the engine to speed up a little bit only. From here, check and adjust the high needle 200RPM or so rich of peak.

In my experience, there is more crosstalk between the needles than any other motor I have had. Hopefully, you can play with it a bit more before you buy a new carb. I can relate to your frustration for sure.

Dale