You should be able to get a Commando motor going fast enough without increasing it's capacity. And a real race cam usually moves the power band up the rev range. However, if you rev a Commando motor over 7000 RPM, you are really asking for it. Compression ratio is limited by the fuel octane rating. What you are left with is an attempt to get better control over fuel/air mixture. In a normal carburetor, the taper on the needles is there to compensate for loss of vacuum as you open the throttle. It also determines how fast you can open the throttle. If you want good throttle response, you usually use a quicker taper. But when you do that you probably often richen the mixture too much, so it is never at the optimum for best power. The FI usually monitors the exhaust and the ignition advance, so the control over mixture is probably better.
With normal Commandos there are two sizes of specified needle jets 0.106 and 0,107 ? The best size is probably somewhere in between and changes all the time as you ride the bike.
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