1. BR400 UD

2. How to power up Modifying Parts: 3.Exhaust Muffler 1.Intake manifold 2. Carburetor

3. How to power up 1.Intake manifold ● Cut off the pipe A. ● Remove the seat and then remove the intake manifold. A

4. How to power up 2. Carburetor ● The modified parts on the carburetor. ● Remove 4 cross-head screws on the tail cover of the carburetor.

5. How to power up ● The look of disassembling. ● Modify the jets. For the main jet of 400CC, change from #127.5 to #145 For the slow jet, change from #37.5 to #42.5 For the main jet of 300CC, change from #127.5 to #132.5

6. How to power up 3. Exhaust Muffler ● Remove 3 screws on the tail cover of the exhaust pipe. ● Take off the dB killer and a gasket. (no longer useful).

7. How to power up ● Reinstall all the disassembled parts in order. ● The look of re-assembling. Inner tube taken off