Made from the best components available on the market, our 150cc Big Bore kit is the perfect addition to upgrade your performance! The kit includes a black powder coated cylinder, 54 mm forged piston, rings, pin and gasket kit. Its compression ratio of 11.38 to 1 will allow you to still use premium pump gas and keep the reliability of a stock motor.
WARNING
THIS IS AN AFTERMARKET PART BUILT FOR RACING PURPOSES ONLY. KOSO IS NOT RESPONSIBLE FOR ANY DAMAGES CAUSED TO THE PARTS, VEHICLE, OR TO YOURSELF AND OTHERS. ENGINE PARTS ARE NOT UNDER WARRANTY NOR IS COLLATERAL DAMAGE OR COST OF LABOR, IN CASES OF MALFUNCTION.
Specifications
Cylinder displacement: 150 cc
Cylinder material: Aluminum / Black powder coated
Piston size: 54 mm
Piston type: Forged
Compression ratio: 11.38:1
Kit includes: piston ring, piston, pin, gasket kit and cylinder
fits Grom® & Monkey® 2022+
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Built for everyday use, the product features carefully chosen components that balance durability with visual appeal.
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Featuring a streamlined and compact design, the product is crafted to fit seamlessly into a variety of spaces and lifestyles.
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We offer a hassle-free returns policy to ensure your complete satisfaction. If you're not happy, simply return it within 30 days for a full refund.
Any questions?
Text us anytime at 519-872-9088 with any questions and we will be happy to help!
Does it come with a warranty?
most items in store come with a manufacture defect warranty to give you peace of mind. we always strive to keep our customers happy with any issues on fitment or quality.
What happens if what i ordered does not fit?
If what you ordered does not fit, we will do a quick check for fitment via pictures of the item and your machine to verify. if the fitment widget was wrong-return cost is on us and a refund or instore credit will apply. Any other return is subject to a re-stocking fee and customer pays for return freight.
How fast is shipping?
most products leave same day if orderd before 11am. or next day if after that. delivery is anywhere from 2-7 days depending location in canada.
What's the returns policy?
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