Trail Bikes 186cc Big Bore Kit - Grom / MSX125 / Monkey (2014-2021)

TB 186cc Big Bore Kit Grom / MSX125 / Monkey Fits: 2014-2021 Models (Does NOT fit 2022-UP as that model has a totally a new motor)

Piston size 64mm
OEM crank Stroke is 57.9mm (For you that enjoy math that's a whopping 186cc of Grom stomping power) Get some wheelies going!!
This is the largest Grom bore kit available on the market and is as big as you can go without having to actually bore your cases.

Please note This kit will only work with the 2021 & older models (2022-UP models has been redesigned)

Fits:
      -Grom 2014-2021
      -Monkey 2014-2021

Kit Includes:
     -64mm Aluminum Ceramic Plated Cylinder w/ larger cooling fins. (Lighter than steel or steel sleeved aluminum cylinders other offer)
(With reduced friction, better ring to cylinder sealing and better heat transfer means it runs cooler and will cool down quicker which means more power!
     -High quality 64mm piston kit that include rings, wrist pin and clips. The pistons are CNC machined to exacting tolerances.
     -Complete 64mm top end gasket kit

These are high quality parts and definitely will dramatically increase the power and fun factor on your Grom!

Trail Bikes Oil cooler kit (Sold separately) is recommended. (BTW we do have a kit that offers the oil cooler to go along with this big bore to save you a few bucks!)

Please NOTE: Must be used with an aftermarket fuel controller to prevent a lean condition and damage to your engine

Check out our Fuel Controller Kit for Honda Grom / MSX 125 on Fast50s.com (Grom / MSX125 page)

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