Bike has a Yoshi exhaust (don't know if it's a slip on or system, sorry) and a K&N panel filter. The mechanic took the jet sizes up 3-4 sizes or so. Anyway, it won't start if I just press the starter, it just cranks. I have to hold the throttle back, just a tiny amount, and it starts right up. This is the way it is at operating temp or cold, if it's been sitting for 10 minutes or 10 hours.

Is this normal, or is there something else I need to be checking in to? I should also mention that the choke is very finicky, if I put it on more than about 2/3 it dies right out. So - reason for concern, or totally normal?

 

I have a Dynojet stage 1 on my F3 and it is the exact same way as what you have described.
but i dont have the choke problem

 

IS your idle speed set 1200-1300?

 

1300-1400.

 

Mine is set at 1200 runs like a champ!!!!

 

mine's at 1200rpm too and always starts warm with 1/10 throttle and cold (even 5ºF) without any throttle, just choke.