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With a two-stroke engine a lot of noise comes from the intake. If you can hear it, it is sonic. What happens at high velocities is different from what happens at low velocities. With aircraft they use transonic wind tunnels to get better flow. With motorcycles, it is what works which counts. Three things work together - rev range, port size and the shape of the needle in the carb. If you have less vacuum (big ports) when you open the throttle, you need more fuel - so more taper. If you have a quick taper needle but wind the throttle on slowly, the mixture can be too rich and that dramatically reduces power, But when you are geared relatively high you do not notice the loss. If you have big inlet ports, the whole power output can be too high in the rev range. With 30mm ports and the leanest Mikuni needles, the throttle needs to be wound on in a more controlled manner, but the bike will accelerate much faster than it will if you have the same size port with quick taper needles, and open the throttle more rapidly.It might sound silly, but to go faster,you need to wind the throttle on slower. A lot of guys get around corners somehow, get the bike pointed, then whack the throttle open. With a Commando engine, the next straight needs to begin at the start of the preceding corner. So handling and smooth power delivery is more important.You need to watch out for the guy you pass as you leave the corner.
With a two-stroke engine a lot of noise comes from the intake. If you can hear it, it is sonic. What happens at high velocities is different from what happens at low velocities. With aircraft they use transonic wind tunnels to get better flow. With motorcycles, it is what works which counts. Three things work together - rev range, port size and the shape of the needle in the carb. If you have less vacuum (big ports) when you open the throttle, you need more fuel - so more taper. If you have a quick taper needle but wind the throttle on slowly, the mixture can be too rich and that dramatically reduces power, But when you are geared relatively high you do not notice the loss. If you have big inlet ports, the whole power output can be too high in the rev range. With 30mm ports and the leanest Mikuni needles, the throttle needs to be wound on in a more controlled manner, but the bike will accelerate much faster than it will if you have the same size port with quick taper needles, and open the throttle more rapidly.
It might sound silly, but to go faster,you need to wind the throttle on slower. A lot of guys get around corners somehow, get the bike pointed, then whack the throttle open. With a Commando engine, the next straight needs to begin at the start of the preceding corner. So handling and smooth power delivery is more important.
You need to watch out for the guy you pass as you leave the corner.
