What is the points gap for 1975 Yamaha rd 350?

If its anything like a DT250, try .015 point gap 3.5mm btdc, use a multimeter frame to black wire on mag harness (unplugged) to check continuity (ohms, 0 @ 3.5mm btdc is right where you need it) You will need a plug feeler to properly set it. Setting the gap means nothing alone.