> > lean may pop in the airbox, rich may pop in the exhaust. with stock setup, the pops are muted and contained within the cat or cans. aftermarket exhaust allows it to be more audible, not necessarily more prone to popping.

Well, I suppose the liberal use of the word 'may' may make the above true :) but popping in the exhaust is very very very often a lean condition. Both lean and rich can however cause it. That much is true. The higher flowing exhausts do NOT just make the popping more audible. They DO increase the amount and amplitude of lean popping too.

you always stand to correct and/or clarify...thanks.

repoe3

Welcome and thanks to you too.
Note in further clarifiying, it's not clear that all exhausts necessarily flow more than stock. In those cases, one _could_ just hear more popping.
For every rule, and exception.

For several years, I used to bet breakfast that a given guy's modified bike's popping was lean. They'd hypothesize otherwise, and I'd bet I could prove it, even if they were skeptical. A quick putt down the road with the choke about halfway on and a lot less popping was often good for a free early meal. Now all these damn injected bikes see me most often buying my own breakfast tacos. Damned technology. I haven't thought up an elegant way to prove my point on the FI'd motors just yet.

Roger, get an EGA and SHOW them the lean misfire. You know what to look for...show them on the meter exactly what happens, and explain why. the EGA doesn't lie.