M-Spec Big Bore Kits
Almost 20 years of increasing the displacement of internal combustion engines has made Millennium Technologies the leader in big bore kit technology. We offer complete, fully developed big bore kits for a huge variety of powersports applications including 2-Stroke and 4-Stroke off-road bikes, sport bikes, ATV/UTV, snowmobile, and watercraft.

M-Spec Big Bore Kit
The M-Spec Big Bore kit is designed to work with your specific vehicle and comes with a complete suite for modifications of your cylinder and perfectly matched pistons, rings, and top end gasket kit.

M-Spec Core Big Bore Kits
To reduce down time, we offer select M-Spec Big Bore Kits from our core cylinder inventory. If a M-Spec Core Big Bore Kit is available for your model, we can immediately ship a complete big bore kit with modified cylinder, pistons, rings, and gaskets with a core charge. When we receive your acceptable core cylinder we credit the core charge back to you card. This will greatly reduce potential down time.

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