I have a Saito 300 Twin with the single carb. I've been breaking it in on the bench and tonight I decided to check my cylinder temps with an Infrared Gun (from my RC car days). With the engine running about 1/2 throttle I have a 40 deg difference in temp. between the 2 cylinders. Looking at the way this is made I noticed that one intake runner is shorter than the other. The cylinder with the shorter intake runs richer, cooler temp, while the cylinder with the long runner runs leaner, hotter temp. Makes sense that the fuel would take the shorter route which is the path of least resistance. This engine was designed this way and with unequal intake lengths and only one carb feeding both it will never be balanced.

Does anyone know why Saito did this???

On the other hand, on my Saito 130T with dual carbs I can get the cylinders running within 5 degrees of each other

I'm stumped![&:]