CBR 250/300 Engine Swap Mount For Honda Grom 2014-2020 and Honda Monkey 2018-2021

CBR Engine Swap Kit for Honda Grom (2014–2020) & Monkey (2019–2021) Transform your Honda Grom or Monkey with the ultimate engine swap kit. Our Chimera CBR Engine Swap Kit allows you to install a Honda NC51 (CBR300/CB300) or Honda MC41 (CBR250) engine into your Grom (2014–2020) or Monkey (2019–2021), unlocking the power and reliability of a water-cooled, 6-speed Honda engine! Key Features: Compatible with Honda NC51 (300cc) and MC41 (250cc) engines 6-speed transmission for improved top speed and acceleration Water-cooled performance and reliability No welding required (Grom); minor frame mod needed (Monkey) Fully reversible install on Grom models Fitment & Installation Notes GROM (2014–2020): Direct bolt-on install — no welding or major chassis mods required 100% reversible — reinstall your 125cc engine anytime MONKEY (2019–2021): Direct bolt-on with minor modifications to the underside of the frame (cutting/grinding needed for clearance) What’s New in the design: 25% lighter design Improved clearance between frame and engine Dual stacked plate system reduces vibration and prevents frame stress cracks — a major issue with single-piece thick plate designs used by others Weight: Just 1.8 lbs Can be Painted to your color. Engine Mount Kit Contents — $199.99: 4x CBR Bolt-On Engine Mounting Brackets (NC51 / MC41) 9x  Spacers 5x Engine Mounting Nuts and Bolts 2x Chain Guide Bearings Note: This listing is for the engine mount kit only. Additional components must be sourced separately. Required Donor Parts And Aftermarket Parts (User-Sourced):   Honda NC51 (CBR300/CB300/Rebel 300) or MC41 (CBR250/CRF250L) engine ⚠️ NC51 engines (2013–2015) may have a crankshaft recall — verify with a Honda dealer before use. Honda CB300F or CBR250/300 Wiring Harness CB300F harness is recommended for easier speedometer integration Grom and CB300F speedometers are interchangeable CBR250/300 harness requires additional wiring and mounting modifications Radiator & Radiator Fan If using Chimera Front Mount Radiator, get a fan from: CBR250, CBR300, CB300, or Rebel 300 If using another radiator, ensure it can handle 250cc–300cc engine cooling Throttle Body Compatible across both NC51 and MC41 engine types Aftermart Parts Needed: CNC Billet Aluminum Intake Manifold or Silicone Elbow Coupler Modified Front Mount Radiator Radiator Hose Kit CBR Swap Header for Grom Aftermarket ECU (Recommended: ARacer) Standard Length Chain Front & Rear Sprockets EGR Valve Block Off Plate Coolant Overflow Tank Breather Oil Catch Can H4 to SF Headlight Adapter Important Notes: Chain Guide Noise: Bearings in the guide make a noticeable sound under engine braking. This is normal and part of the design. Radiator Fitment: Inner plastic trim must be modified for Front Mount Radiator clearance ECU Compatibility: OEM ECUs from NC51/MC41 will not run standalone Recommended ECUs: ARacer RC Super 2 with AF2 (full race-tuning) ARacer Mini 5 or Mini-X with AF2 (best value easy tuning) 2017 Grom LED Headlight Compatibility: Requires Tripage TRIP-1001 headlight adapter NOT Compatible with 2022 Grom or Monkey models ⚠️ WARNING: The added power from the engine swap significantly increases torque and acceleration. Expect wheelies during launch or gear shifts on short wheelbase setups. For off-road use only.   SKU: 300grm Categories: Grom / MSX 2014-20, Grom Engine, Monkey 125, TRS PRODUCTS Tags: 300 swap, cbr300, grom 300 swap, grom swap