Right cylinder of my '73 850 is still intermitently misfiring at idle. Left side is steady, and strong, but right will sort of cough. I cleaned out the air circuit of the Amal 932 carbs with wire and carb cleaner, then blew out the circuit with air. I switch from NGK BP8ES to BP7ES plugs.Right carb gets excellent fuel flow. I am thinking this is probably an ignition issue. Boyer stator wires were replaced a few weeks ago. Today I decided to check the rocker clearances. Following the shop manual I found that when checking clearances for inlet and exhaust, the clearances were less than .006, and .008 . I found that when adjusting them that there was some slight play in the rocker arm if I lifted up on the arm, so that I didn't know if the feeler guage should nip with the rocker lifted up, or if the guage should nip with the rocker pushed to the down position. I elected to set the clearance in reference to the arm in the pushed down position, thinking that at least the clearance would be more than adequate. After starting up the engine, the left side was again strong and steady, but the right side is much the same, and seems like there is less compression. If you put your ear near the right muffler, you can hear the exhaust tone is hollow sounding, which was not apparent before I did the adjustment. I will have to go back and check those clearances again, but I would like to know if I did it the right way. I don't believe I did.