Right side is backfiring occasionally on deceleration, leading me to believe that that side is probably running a little rich. As I understand it, the air/fuel screws on each carb should be equal. But what if one side is running rich?!
Lighter colored plug is the side that is backfiring and the spark plug was a lot hotter than the other. This is also the side that is backfiring. It pops quite a bit at idle and then will produce small backfires while coming off throttle, but lessens in frequency when it warms up. Here's where it gets weird... the actual EXHAUST temperature is HOTTER coming off the left side that doesn't pop which is also the blacker plug. These all seem like opposites to me!
Well from the pics it doesn't look like either one has that nice brown coloration. They both look more on the whitish side. Maybe it's the way the pics came out though. How many turns out are the needles set at?
They are both at factory 2.5 turns out. I think tomorrow I'm going to set them according to thr manual procedure. I have read it, but it only seems to talk about one side. Is there a side I should start with?
I had an occasional backfire on deceleration also. Following some reading tonight I inspected my plugs. Realized the gap was off. 0.024 versus 0.028. Adjusted and runs much better without backfiring. Like several times before, I tweaked and found more power. Wahoo! Now you guys have me wanting to tweak the carb a little more. My plugs look similar to the lighter one above. Perhaps a little lean? Plan on doing so in the morning.
Thanks again for all the information. Very much appreciated.
If you replaced it with a new one I doubt it would have holes in it.If it did that would have been real bad luck
I'd still check for exhaust leaks and carb boot leaks.They can be really really sneaky.I had an old set of stock cans on and there was a hole hidden inside the sliding bolt thingy(Technical term<grin>) that secures the exhaust to the bracket.It didn't show or sound much until I revved the bike and of course really only showed when it got big-enough but was causing backfires before it made itself known