Click on image to zoom

Koso 170cc Big Bore Kit with 4 Valve Head - Grom / MSX125

Grom / MSX125
Pricing: $1,039.95


Koso 170cc Big Bore Kit with 4 Valve Head - Honda Grom MSX125

Want to unleash all the potential power of your Honda GROM?
Koso's 170cc Big Bore Cylinder kit for Honda GROM is the perfect addition for you!
The kit includes a ceramic coated cylinder, 61 mm forged piston, rings, pin, gasket kit and banjo bolts.
Its compression ratio of 11.5 to 1 will allow you to still use premium pump gas and keep the reliability of a stock motor. Made from the best components available on the market, Koso's 170cc GROM® big bore cylinder kit will amaze you!

Included in kit:
     -11.5:1 Compression Ratio
     -Forged 61mm Piston (169.2cc)
     -Aluminum / Ceramic coated
     -High Lift / Long Duration Performance Camshaft
     -Rocker Arms
     -4 Valve Cylinder Head
     -Intake Manifold
     -All needed Gaskets and more

All parts are made from High‑quality components for reliability and durability that allow you to put your mind at ease and ride with confidence!

All of the above parts are not legal for use in California on pollution controlled vehicles. (Road going vehicles) However a race waiver is available.

If you have any questions please call one of our knowledgeable and friendly techs at 833-327-8507


  • Koso
  • New


Shipping Information

  • Item Requires Shipping
  • 6.0 lbs.

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.

  • FAST ShippingWe ship out items quickly! International Shipping available
  • Safe & Secure Worry-free Online Shopping
  • Online e-tailerWe've been in business since 1999
  • Largest Mini Bike Parts SelectionBest Quality Made Parts Available