Our world renown Millennium Technologies repair services will bring your cylinder or cylinder head back to OEM specifications, but if you want something better than stock, we also offer M-Spec. The largest most comprehensive line of Big-Bore Kits, Cylinder, and Cylinder Head Modifications in the world. These fully developed kits and modifications are available for 2-Stroke MX, 4-Stroke MX, ATV, UTV, and Street Applications.

You can use our vehicle finder to highlight all the M-Spec products we offer or look at the specific product categories listed below

Select your year and model from the drop-down lists. If your vehicle is not listed in our vehicle finder, please contact us at 1-888-779-6885 or info@millennium-tech.net and we will be happy to help find a solution.







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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.

4-Stroke CNC Head Porting

Through our partnerships with the best builders in the country, we are able to provide fully developed CNC ported cylinder head services to our retail and dealer customers. Our CNC ported head services are perfect additions to our big-bore kits.

Two-Stroke Performance Services

Millennium Technologies offers a complete line of high-performance 2-Stroke services including big-bore kits, cylinder porting, head and base machining services along with our best in class Nickel Silicon Carbide (NSC) cylinder plating process. Learn how Millennium Technologies can make your 2-Stroke fly!

Engine Rebuilding Services

Millennium Technologies can handle your engine rebuild from top to bottom. We offer complete engine assembly and rebuild services for a wide range of powersports engines. These services are available to assist retail customers who may not have the time, technical expertise, or equipment to assemble their engine themselves.



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