Millennium
Millennium specializes in high-precision engine performance components for powersports and off-road applications. The brand is widely recognized for big bore cylinder kits, performance piston kits and engine gasket kits engineered to restore and enhance engine output. Millennium products are designed to deliver reliable power gains, improved durability and consistent tolerances across demanding riding conditions. Their lineup supports popular platforms such as Polaris and Yamaha, making Millennium a trusted choice for performance rebuilds and upgrades.
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Millennium - 09310705 - Cylinder Kit - +5.00 mm - Big Bore - M-Spec - Polaris 800 - Fits Polaris 2010-2014 Ranger 800, 2009-2014 RZR 800/S, 2011-2014 RZR 4 800, 2005-2014 Sportsman 800
Millennium
$1,495.00Millennium - 09310705 - Cylinder Kit - +5.00 mm - Big Bore - M-Spec - Polaris 800FeaturesIncludes high-performance forged piston kit with rings, tool steel wrist pins and locksComes with complete...$1,495.00 -
Millennium - 09310704 - Cylinder - +5.00 mm - Big Bore - M-Spec - Polaris 1000 - Fits Polaris 2016 General 1000, 2016 RZR S 1000, 2014-2016 RZR XP/4 1000
Millennium
$999.95Millennium - 09310704 - Cylinder - +5.00 mm - Big Bore - M-Spec - Polaris 1000FeaturesNickel silicon carbide (NSC) plated cylinderMaximum strength, durability, and powerMade in the USASpecs$999.95 -
Millennium - 09310703 - Cylinder Kit - +5.00 mm - Big Bore - M-Spec - Polaris 1000 - Fits Polaris 2016 General 1000, 2016 RZR S 1000, 2014-2016 RZR XP 1000, 2014-2016 RZR XP 4 1000
Millennium
$1,495.00Millennium - 09310703 - Cylinder Kit - +5.00 mm - Big Bore - M-Spec - Polaris 1000FeaturesIncludes high-performance forged piston kit with rings, tool steel wrist pins and locksComes with complete...$1,495.00 -
Millennium - 09310702 - Cylinder - +5.00 mm - Big Bore - M-Spec - Polaris 900
Millennium
$999.95Millennium - 09310702 - Cylinder - +5.00 mm - Big Bore - M-Spec - Polaris 900FeaturesNickel silicon carbide (NSC) plated cylinderMaximum strength, durability, and powerMade in the USASpecs$999.95 -
Millennium - 09310701 - Cylinder Kit - +5.00 mm - Big Bore - M-Spec - Polaris 900 - Polaris RZR, Ranger, ACE & More
Millennium
$1,495.00Millennium - 09310701 - Cylinder Kit - +5.00 mm - Big Bore - M-Spec - Polaris 900FeaturesIncludes high-performance forged piston kit with rings, tool steel wrist pins and locksComes with complete...$1,495.00 -
Out of stock
Millennium - 09310699 - Cylinder Kit - +5.00 mm - Big Bore - M-Spec - Polaris 570 - Fits Polaris 2015-2019 ACE 570, 2014-2021 Ranger Crew 570, 2012-2021 RZR 570, 2014-2021 Sportsman 570
Millennium
$449.95Millennium - 09310699 - Cylinder Kit - +5.00 mm - Big Bore - M-Spec - Polaris 570FeaturesIncludes high-performance forged piston kit with rings, tool steel wrist pins and locksComes with complete...$449.95 -
Millennium - 09105034 - Piston Kit - +5.00 mm - Big Bore - M-Spec - Polaris 1000 - Fits Polaris 2016 General 1000, 2016 RZR S 1000, 2014-2016 RZR XP/4 1000
Millennium
$449.95Millennium - 09105034 - Piston Kit - +5.00 mm - Big Bore - M-Spec - Polaris 1000Features4-stroke pistons are made using a double-bridged forging designLightweight pistons with the tightest...$449.95 -
Millennium - 09105026 - Piston Kit - +5.00 mm - Big Bore - M-Spec - Polaris 900
Millennium
$449.95Millennium - 09105026 - Piston Kit - +5.00 mm - Big Bore - M-Spec - Polaris 900Features4-stroke pistons are made using a double-bridged forging designLightweight pistons with the tightest piston-wall...$449.95 -
Millennium - 09105025 - Piston Kit - +5.00 mm - Big Bore - M-Spec - Polaris 570
Millennium
$269.95Millennium - 09105025 - Piston Kit - +5.00 mm - Big Bore - M-Spec - Polaris 570Features4-stroke pistons are made using a double-bridged forging designLightweight pistons with the tightest piston-wall...$269.95
Millennium Performance Engine Systems – Big Bore Cylinders, Pistons & Gasket Kits
Millennium is known for manufacturing advanced big bore engine components that help riders and builders unlock additional displacement, power and reliability. Their M-Spec big bore cylinders and cylinder kits are precision-machined and engineered for optimal heat transfer, wear resistance and long-term performance. Designed for popular Polaris platforms, Millennium cylinder solutions support performance rebuilds where accuracy and durability are critical. These components are ideal for riders looking to increase torque and horsepower without compromising engine integrity.
Complementing their cylinder offerings, Millennium produces performance piston kits that are specifically matched to big bore applications. These pistons are designed to maintain correct clearances, compression characteristics and smooth operation under high-load conditions. When paired with Millennium big bore cylinders, the piston kits create a balanced engine package that improves throttle response and overall power delivery. This combination makes Millennium a strong option for enthusiasts rebuilding worn engines or pursuing performance-focused upgrades.
Millennium also offers engine gasket kits designed to ensure proper sealing and long-term reliability after engine work. Their gasket solutions support precise installation and help prevent leaks in high-performance applications. With a strong reputation in the powersports industry for quality machining and performance-focused engineering, Millennium engine components remain a preferred choice for riders seeking dependable big bore kits, cylinders, pistons and gaskets for demanding off-road and utility environments.