Pinto Misfire & temperatures

[mark]

Air leaks are quite common when people are doing the bike carb thing and the syptoms are exactly as you describe

My old cvh install did a similar thing until i got the manifold skimmed

Try using a blow lamp unlit on full, aim the gas around all the flanges and joints at idle and see if the engine picks up

If it does then its an easy fix, if not could be carb settings