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Trail Bikes 186cc Big Bore Kit - Honda Grom / MSX125

Trail Bikes 186cc Grom / MSX125 Big Bore kit
Pricing: $259.95


Trail Bikes Grom 186cc Big Bore Kit

Piston size 64mm
Stroke (oem crank) 57.9mm (For you that enjoy math that's a whopping 186cc of Grom stomping power) Get some Grom wheelies going!!

This is a brand new 186cc Big Bore Performance Kit from TBparts.

For you that know Trail Bikes is the USA leader in performance big bore kits for the Honda 50, 70, 100, and 110cc models.

This is the largest Grom bore kit available on the market and is as big as you can go without having to bore your cases.

Kit Includes:
- 64mm Aluminum Ceramic Plated Cylinder. (Lighter than steel or even steel sleeved aluminum cylinders on the market.
(Reduced friction, better ring to cylinder sealing, better heat transfer which means it runs cooler and cooler down quicker. ALL equating to 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 Bazazz Fuel Controller Kit, DynoJet Fuel Controller or Takegawa's Fuel Controller for Honda Grom / MSX 125 on


  • K9150TB
  • K9150TB
  • Trail Bikes
  • New


Shipping Information

  • Item Requires Shipping
  • 4.0 lbs.

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