Light Rider Suzuki's GSX125-3G/H, Suzuki King Black. Howe Suzuki's Diamond Leopard HJ125K-3A,EN125-3E/F, EN150/A, the engines are all with balance shafts, and the engines are basically the same, except that the EN's engine is an enlarged heatsink, and they are all improved from Suzuki's GS machines.

The former is a round light, the latter with deflector. Howe Jenn Suzuki is Howe Jenn purchased Suzuki's engine hangs back on Howe Jenn's frame, the overall quality is not as good as the light riding Suzuki. There are a couple of Howe answering jenn Suzuki Razorbacks with balance shafts.

Extended information:

In the engine's working cycle, the piston moves very fast and unevenly. At the upper and lower stop positions, the speed of the piston is zero, while the speed reaches its maximum at the position in the middle of the upper and lower stops. As the piston in the cylinder to do repeated high-speed linear motion, necessarily in the piston, piston pin and connecting rod on the generation of a large inertia force.

Counterweight on the connecting rod can effectively balance these inertial forces. However, only part of the moving mass of the counterweight on the connecting rod is involved in linear motion, and the other part is involved in rotation. In addition to the upper and lower stop positions, the various inertia forces can not be completely balanced, so that the engine vibration.

When the piston every up and down movement, will make the engine to produce an up and down two vibration, so the engine vibration frequency and engine speed related. In the vibration theory, often use more than one harmonic vibration to describe the engine vibration, which vibration frequency and engine speed is the same called first-order vibration, the frequency is the engine speed 2 times called second-order vibration, and so on, there are third-order, fourth-order vibration.

But the higher the vibration frequency, the smaller the amplitude, more than 2 orders can be ignored. Its first-order vibration accounts for more than 70% of the whole vibration, is the main source of vibration.