Chiffee can you post or email me that .WRL file? I need to see the entire data log so I can see what lines are what here.
But I did ask Justin about it, and this is what he said:
hi mate, is it just after the roll off the throttle?
this is pretty normal and not fuel cut
fuel cut is a long period of injector cut with 0 throttle
the spike when you first roll of the throttle is , to my understanding, more due to what is physically happening with the bike, ie, you have a lot of air pumping into the engine
you roll the throttle off
injector flow is substantially reduced
but there is still a proportionally larger air flow into the engine
result - short lean spike