Big Bore Kit
Unleash raw, tire-shredding horsepower and dramatic low-end torque increases by expanding your engine’s internal displacement. CG ATV & UTV Parts Shop supplies elite, precision-engineered ATV & UTV big bore kits engineered to maximize combustion volume without sacrificing structural cylinder integrity. Factory top-end assemblies are restricted by conservative emission and multi-market production standards, leaving massive amounts of potential torque trapped inside choked-down factory bores that struggle to spin heavy, oversized mud tires through deep bogs or loose sand dunes.
Our domestic fulfillment channels ship out daily from strategic distribution points to keep your high-performance engine overhauls progressing with minimum garage downtime. Whether you are building an aggressive trail-bashing machine with a complete bolt-on cylinder sleeve package, dropped-in forged pistons, and race gaskets, or matching your displacement increase with heavy-duty connecting rods and bearings, our catalog delivers unmatched structural reliability. Dominate the dunes and skyrocket your machine’s mechanical thresholds using our ultimate power-building big bore collections.
Cylinder Works HC Big Bore Cylinder Kit Kawasaki Brute Force / Teryx 750 2005-2014
Cylinder Works Big Bore Cylinder Kit
Cylinder Works Big Bore Piston Kit 23403B
Bolt-On Engine Displacement Upgrades & High-Compression Forged Pistons
Upgrading to a high-performance ATV & UTV big bore kit swaps out your restrictive factory top end for an oversized, precision-honed cylinder assembly designed to maximize combustion surface area. Premium aftermarket blocks incorporate advanced Nikasil (nickel silicon carbide) or composite ceramic inner coatings that drastically reduce ring friction while improving heat dissipation out to the radiator coolant jackets. This specialized plating structure allows the engine to hold tight cylinder wall sealing pressures under massive heat loads, directly increasing volumetric efficiency.
To support this increased internal displacement, race-spec kits bundle premium forged pistons instead of weaker cast factory varieties. Forged pistons feature a denser aluminum grain structure that handles violent ignition explosions and high compression ratios without warping or cracking at the ring lands. Matched with multi-layer steel (MLS) head gaskets, these elite top-end setups handle increased thermal expansion easily, safeguarding your bottom crankcase from compression blow-by leaks.
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Coordinate corresponding powertrain adjustments, bottom-end reinforcements, and chassis upgrades from our stock:
- Crankshaft Bearing Links: Support your newly added displacement with robust, high-load ATV & UTV Connecting Rods.
- Drivetrain Torsional Upgrades: Deliver massive top-end torque straight to the wheels by updating to a heavy-duty replacement CV axle assembly.
- Front Alignment Support: Stabilize your front geometry during hard accelerations using reinforced chromoly ball joints.
- Deep-Cycle Power Protection: Keep high-compression electric starters firing instantly with a high-cranking sealed AGM powersports battery.
- Cab Splash Deflectors: Protect yourself from trail roost thrown up by your newly found acceleration speed with a hard-coated Seizmik Versa-Vent Windshield.
Fuel Remapping & Cylinder Break-In Engineering Guidelines
Because expanding your engine’s physical displacement alters the baseline air-to-fuel ratio, you must install an aftermarket EFI fuel controller or flash the ECU to prevent running a dangerously lean fuel mixture that can melt your fresh pistons. During the critical initial break-in period (typically the first 5 to 10 heat cycles), avoid sustained wide-open throttle settings and use a high-zinc non-synthetic break-in oil to seat the new rings cleanly against the cylinder cross-hatching. For strict industrial engineering protocols regarding combustion chamber pressure tolerances, aluminum metallurgical forging formulas, and piston skirt clearances, refer to the active documentation in the International Organization for Standardization (ISO) Directory.