I have recently upgraded my scooter to 106, with 10.5:1 CR, heads ported, larger valves, Tmax autotune, Woods TW 555 cams. I currently have 14 discs closed end cap, sound is close to what I like (noise bylaws), roll on is strong from 2200, fuel economy is excellent. In general, I am very pleased.

However, I was hoping for a little more punch in the 4,000 +rpm, am I restricting the flow too much with 14 discs?

Can you suggest a different disc configuration?