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Kitaco NEO 181cc Big Bore Kit – Forged Crank & Head for Honda Grom & Monkey 125

Kitaco NEO 181cc Big Bore Kit – Forged Crank & Head for Honda Grom & Monkey 125

SKU:212-1432850

Regular price $1,359.95 USD
Regular price Sale price $1,359.95 USD
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Kitaco NEO 181cc Big Bore Performance Kit – Honda Grom / MSX / Monkey 125 (4-Speed)

The Kitaco NEO 181cc Big Bore Kit is the most comprehensive engine upgrade available for the Honda Grom, MSX125, and Monkey 125. Built around a forged piston, forged crankshaft, and a fully upgraded top end, this kit transforms your 125cc platform into a hard-hitting 181cc powerplant — with the internals to back it up.

⚠️ California Residents – Do Not Order: This product is NOT legal for sale, installation, or use on a pollution-controlled vehicle in California. NOT CARB legal. Legal only for closed-course racing competition. Orders from CA will be cancelled and refunded.

What’s Included

  • 181cc Forged Piston — high-strength forged construction for increased displacement and durability
  • 181cc Hard-Plated Cylinder — precision-bored and plated for longevity under high-performance use
  • Piston rings, pin, clips & gasket kit — complete sealing hardware included
  • Kitaco Forged Crankshaft — handles the increased power and RPM demands of the 181cc build
  • Kitaco Forged H-Style Connecting Rod — stronger than OEM for sustained high-performance use
  • High-Performance Camshaft & Head — optimized valve timing and flow for maximum power output
  • Reinforced Cam Chain — upgraded for reliability at higher RPM
  • Heavy-Duty Valve Springs — prevent float at elevated engine speeds
  • Heavy-Duty Cylinder Studs — secure head clamping under increased cylinder pressure
  • Hi-Flow Fuel Injector — supports increased fuel demand of the larger displacement

Note: Fuel controller is NOT included and will be required for proper tuning.

Fitment

  • Honda Grom (MSX125) — 2013–2020, 4-speed
  • Honda Monkey 125 — 1st Gen, 4-speed
  • Honda Super Cub / Trail 125 — compatible variants

Emissions & Legal Compliance

This product is intended for closed-course competition use only. It does not meet the emissions regulations for pollution-controlled roads or highways. Qualified Manufacturer Declared “Modified Part.” Not for sale in California.

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