162fmj Engine Service: Manual

"Chinese 125cc engine service manual PDF"

The manual lists the stock cam lift (usually 5.0mm). If you want more power, you can source a "race cam" (6.5mm lift), but the manual warns that exceeding the valve spring coil bind limit (found in Section 3) will destroy the engine. 162fmj Engine Service Manual

Choose an option or correct the engine details. "Chinese 125cc engine service manual PDF" The manual