I have a 1975 Honda 360. I recently re-built the carb. Both sides have great compression and they both are getting spark. But only one side will fire at a time. The left runs great, but the right will not start the bike on its own and if i pull the left spark, i have to run the bike at near full throttle to keep it running. Also the right side fuel adjustment screw has no effect on the way it runs- i am stumped.