105 main jets are for if you have stock intake and exhaust. You are far from that with the CR's (you didnt specify what type of 4:1 exhaust you have)
You need to match the main jets to the intake air supplied to get the correct ratio.
Your bike doesnt care what # is on the jets. It only cares about feeding on the correct A/F ratio at all throttle positions.
FJ is right, go with K&N pods. You might be really close with 120's. Only your plugs or a dyno will tell....