KOSO Honda Grom/Monkey 170cc 4 Valve Performance Cylinder Kit w/ Forged Piston (2014-2020)Koso 2014 2020 Honda Grom 4 valve head and 61mm performance cylinder kit with a forged piston. This is a completely newly designed head using a pair of 24mm intake 21mm valves exhaust valves with matching large intake and exhaust port. This Koso 4 Valve can produce up to 23 26hp vs. stock 8 9hp. This is a performance engine part, there are no returns on performance parts or individual pieces. Need a replacement piston, see our KOSO 4V Replacement

AM / FM / WB Tuner

These characteristics including the larger valve size provide more flow allowing for better performance

Speaker Type2-Way Coax

3-Year Unconditional Guarantee

Smooth Finish

GET Riders

Flush Mount LED Turn Signals fits the Honda Grom/MSX125

greater mechanical ease at high speeds and consistency in performance you've never experienced before with the original variator

Engine Ice is a high-performance coolant that is used to reduce operating temperatures during riding or driving

2 Wired Microphone

Magura Hymec Hydraulic Clutch Conversion for the Honda Grom & Honda Monkey is one of the best clutch options available on the market

Perfect affordable replacement if you've shattered your tail light