Hi guys, just curious to understand a phenomenon that happened recently. My ‘70 was a little harder to start than normal (it had been a while between starts...) and when I did get some life, it settled down to an pretty normal idle, however it was popping (almost more like a backfire) out of my right side exhaust pipe. Frequency was probably every second or two. I parked it back in the garage for a later check/review.
Today I pulled all the plugs and the right side (cyl 2/4/6/8) were pretty even, but all were wet/oily. The left side (cyl 1/3/5/7) were a little carboned up ( similar to the right) but mostly dry. I gave them all a good clean and loaded them back in. I figured that it was running too rich, so I checked my mixture screws: FL @ 1-1/8 turn from seat), FR @ 1-1/8, RL @ 1-1/2, RR @1-1/8. I screwed in the RL in to 1-1/8 turn, figuring that it may have worked it way out a little, but didn’t expect it to change the heavier fuel load on my Right hand side. I check all of my spark leads and they looked perfect.
Started up okay, however again a little harder than usual. When started, no exhaust pops/backfires were noticed.
Any ideas?