SP Takegawa SF Crankshaft Support Adapter – Honda Grom / MSX125 / MSX125SF

SP Takegawa SF Crankshaft Support Adapter – Honda Grom / MSX125 / MSX125SF

Protect your stock crankshaft and push your build further with the SP Takegawa SF Crankshaft Support Adapter. This patent-pending upgrade converts the OEM 3-point crankshaft journal to a 4-point support system using a precision ball bearing in the stator, dramatically reducing crankshaft runout at high RPM — a critical upgrade for any bored-up or high-response Grom engine build.

Why You Need This

On the Honda Grom, MSX125, and MSX125SF, the generator is mounted on the left crankcase cover, positioning the flywheel weight toward the outer shaft tip. Under hard acceleration and deceleration, this eccentric load can cause crankshaft flex, generator-to-flywheel interference, ignition timing issues, and in severe cases, crankshaft damage. The Takegawa Crankshaft Support Adapter eliminates this risk without requiring a crankshaft replacement.

Features

• 4-Point Crankshaft Journal Support – Adds a ball bearing to the stator to stabilize the crank at high RPM
• Reduces Crankshaft Runout – Limits flex and wobble in bored-up, high-response engine builds
• No Crankshaft Replacement Required – Installs onto stock parts using a patent-pending design
• Increases Stock Crankshaft Durability – Extends the life of your OEM crank under performance conditions
• Highly Recommended for SP Takegawa Engine Builds – Essential pairing with the Super Head 4V+R Big Bore Kit and other high-response SP Takegawa parts

Compatibility

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

Important Notes

• Check your current crankshaft for runout before purchasing. If runout exceeds the standard value, the crank must be trued or replaced prior to installation.
• Product number varies by vehicle name and frame number — confirm your model before ordering.
• Not compatible with SP Takegawa generator plugs 05-02-0044, 05-02-0045, or 05-02-0046.
• Instruction manual, if included, will be in Japanese.
• Product specifications subject to change by manufacturer.