Changing secondary holes affects the up & back-shifting. Different tensions for different shift patterns.

 

Dammit Dune........... you beat me to it,hehe.[img]i/expressions/face-icon-small-blush.gif[/img]

 

LOL. I beat ya.[img]i/expressions/face-icon-small-happy.gif[/img]

 

the only thing i can add is ,whenever it sound be,like a totally brand new model,it shouldn't be lean or rich unless the dealer prep was changed
to different specifications,like it was stated above,the power lost,seem
to be when engine get hotter,maybe a switch to a colder plug will help,
or just doesn't idle too long before riding,but let's start sooner but
slower at first,maybe it should drop some degree in the long run.