Morley vs Stage 7 AFR

[thor_eyerdhal]

For those who swapped between both kits, did you noticed a leaner or richer one (without any jet or exhaust changes) ?


Because this is what i found on my bike :

1) Stage 7 with
150 mains
177.5 PAJ2
100 PAJ1
S7 needle 1.5 groove from top
=> 12.3-12.5 AFR at WOT

2) Morley kit with
147.5 mains
170 PAJ2
90 PAJ1
S7 needle 3.5 goove from top
=> 14-14.3 AFR at WOT

I am wondering why this little change with mains (2.5), also buffered with PAJ changes give this "big" bump in AFR..?

Is main jet size overide PAJ changes so much? Or should i add the Morley's kit in the equation...?

 

[one2dmax]

Sounds like you're getting more air in there with my kit?