DHM 149cc Big Bore Kit for 2022+ Honda Grom & Monkey 125 - Generation 2 Performance

DHM 149cc Big Bore Kit - Generation 2 for 2022+ Honda Grom & Monkey 125

Transform your 2022+ Honda Grom or Monkey 125 with DHMotoring's second-generation 149cc big bore kit. Engineered for maximum performance and simplified installation, this Gen 2 kit delivers 30% midrange gains and double the stock horsepower at 8500 RPM.

Performance Gains:

• 30% horsepower and torque increase in midrange over intake/exhaust/cam setups
• Double the horsepower of stock at 8500 RPM
• Significant power gains across entire rev range

Generation 2 Improvements:

• Wider skirt bridges for improved squirter clearance
• Enhanced lubrication with additional oil control ring hole
• Two additional piston skirt lubrication holes
• Optimized 12:1 compression ratio for pump gas to reduce hot detonation
• Streamlined manufacturing for better value

Complete Kit Includes:

• 55mm forged piston with ring kit
• 55mm sleeved cylinder
• Base and head gasket set

Required Components (sold separately):

• DHM ECU flash or aRacer MiniX + AF3 combo
• Honda injector 16450-KZY-701 (PCX 150 injector)
• Oil cooler (Kitaco x DHM recommended)
• NGK CR9E spark plug
• Crankcase vent (AvailMS Cam Cover Vent recommended)

Installation Notes:

• Ring gaps must be set during installation - see setup sheet
• Use both base gaskets for pump fuel (91-93 octane), OEM gasket only for race fuel
• Oil cooler required - monitor oil temps closely
• 91 octane minimum, 93 octane preferred

Fitment: 2022+ Honda Grom, Monkey 125, Dax 125, Super Cub, Trail 125 (JC92 platform)

Unlock serious performance with DHMotoring's proven big bore technology.