Yes, a pipe will change your AFR. Who knows, it may make your AFR better?
Get yourself some sort of tuner that is capable of datalogging. I will not mention names or brands, there are several good ones out there.
Learn how to use it and go from there.
Get it out of your head that 12.5 is best. Your bike will like what it likes and will run best when the AFR is set where the bike wants it. Sorry that is so vague, but it is fact. All bikes and builds are different.
Example:
What "typically" works best for accelleration (WOT) is a lean spike followed by a rich drop in AFR. What afr ratio is that? Your bike will tell you in a datalog.
Sorry this is not what you really wanted to hear. You have a learning curve ahead of you before your bike is running tip top.
Get yourself some sort of tuner that is capable of datalogging. I will not mention names or brands, there are several good ones out there.
Learn how to use it and go from there.
Get it out of your head that 12.5 is best. Your bike will like what it likes and will run best when the AFR is set where the bike wants it. Sorry that is so vague, but it is fact. All bikes and builds are different.
Example:
What "typically" works best for accelleration (WOT) is a lean spike followed by a rich drop in AFR. What afr ratio is that? Your bike will tell you in a datalog.
Sorry this is not what you really wanted to hear. You have a learning curve ahead of you before your bike is running tip top.