MONKEY

Honda Monkey 125 Big Bore Kits

Upgrade your Honda Monkey 125 (MSX125 platform) with big bore kits from Takegawa and Kitaco. The Monkey 125 shares its engine with the Grom, making it compatible with the same range of 143cc to 181cc bore-up kits for significant power gains.

Monkey 125 Big Bore Options — 143cc to 181cc

Takegawa and Kitaco both offer big bore kits for the Honda Monkey 125 and MSX125. The 143cc kit provides a noticeable power bump while maintaining reliability. The 181cc kit is the top-end option for riders who want maximum displacement from the Monkey 125 engine.

Performance Cams & Engine Parts

Pair your Monkey 125 big bore kit with a Takegawa or Kitaco performance camshaft for optimized valve timing and additional power gains. Also available: valve springs, head gaskets, and complete engine build kits for the Monkey 125.