Koso
Koso Big Bore Kit
$555.61
Includes a ceramic coated cylinder, 61mm forged piston, rings, pin, pin clips, gasket kit, and banjo bolts Compression ratio of 11.5 to 1 allows the use of premium pump gas to keep the reliability of the stock motor
View product detailsIn stock
Saved catalog stock record Sep 19, 2026
- Manufacturer part #
- MB640000
Vehicle compatibility
Choose your vehicle to check this item's listed applications.
Choose your vehicle →Product description
Includes a ceramic coated cylinder, 61mm forged piston, rings, pin, pin clips, gasket kit, and banjo bolts Compression ratio of 11.5 to 1 allows the use of premium pump gas to keep the reliability of the stock motor
Features
- Includes a ceramic coated cylinder, 61mm forged piston, rings, pin, pin clips, gasket kit, and banjo bolts
- Compression ratio of 11.5 to 1 allows the use of premium pump gas to keep the reliability of the stock motor
Specifications
- Product Type
- Engine
- Segment
- Street
- Sub Segment
- Mini Bike
Listed vehicle applications
24 vehicle applications for the selected item. Showing 12 examples. Use the vehicle selector for an exact check.
| Year | Make | Model / configuration |
|---|---|---|
| 2021 | Honda | MSX125 Grom |
| 2022 | Honda | Z125A Monkey ABS |
| 2022 | Honda | MSX125A Grom ABS |
| 2022 | Honda | MSX125 Grom |
| 2023 | Honda | MSX125A Grom ABS |
| 2023 | Honda | MSX125 Grom |
| 2023 | Honda | Z125A Monkey ABS |
| 2024 | Honda | MSX125A Grom ABS |
| 2024 | Honda | MSX125 Grom |
| 2024 | Honda | MSX125 Grom SP |
| 2024 | Honda | Z125A Monkey ABS |
| 2022 | Honda | Z125 Monkey |
What Our Customers Say
“Great place to buy from great parts great people”
“10/10 experience with Empire Cycle. Kristin and Joe are great to work with and very helpful. Will absolutely do business with them again.”
“I had a pleasant experience doing my business with these folks! I purchased a 2024 CF MOTO 450SS. They communicate with you well, care about what your needs are, and prioritize your satisfaction. I also took my another bike for mods. Austin and Amy do an amazing job! Thank you, everyone!!”
“Amazing people!! Helped me out with parts when I was in a pinch and they were very friendly. I would recommend anyone looking for moto supplies or new vehicles to stop in and see what they got.”
“Awesome people and great deal on gear! Outfitted the whole family and several friends with the insane Helmet deals. Keep it up 🙏”
“:) Thank you”