SP Takegawa 5-Speed Cross Transmission Kit – Honda Grom / MSX125 / Monkey 125

SP Takegawa 5-Speed Cross Transmission Kit – Honda Grom / MSX125 / Monkey 125

Unlock smoother acceleration and tighter gear spacing with the SP Takegawa 5-Speed Cross Transmission Kit. By adding a fifth gear and optimizing the gear ratios across the entire range, this kit keeps your engine in its power band longer — whether you’re running a stock motor or a full SP Takegawa big bore build. Short-stroke gear travel improves shift feel and increases durability, making this one of the most impactful drivetrain upgrades available for the Grom platform.

Features

• 5-Speed Cross Transmission – Adds a 5th gear and tightens ratio spacing for smoother, more efficient acceleration
• Short-Stroke Gear Travel – Secures tooth width and improves shift durability under hard use
• Compatible with Stock & Big Bore Engines – Works with OEM motors and SP Takegawa big bore kits without sacrificing torque output
• Includes Gaskets – L. Crankcase cover gasket and R. Crankcase gasket included in the kit

Gear Ratio Comparison

Compatibility

• Honda Grom (OG MSX125, SF MSX125SF)
• Honda Monkey 125 (1st Gen)

Important Notes

• Speedometer: The stock speedometer will not operate after installation unless a compatible speed sensor kit is installed simultaneously.
• Required Tools: Flywheel puller for Grom/MSX125 and a lock nut wrench rotor holder are required for transmission replacement.
• Instruction manual, if included, will be in Japanese.
• Product specifications subject to change by manufacturer.