Restore your Yamaha 250 YZ engine performance with the Athena P4F0664267019B Top End Piston Kit. Designed specifically for Yamaha 250 YZ models from 1999-2023, this complete rebuild solution includes a precision-engineered 66.35 mm cast piston and matching top end gasket kit for reliable sealing and long-lasting durability. Athena develops and tests its piston technology and gasket components together to ensure optimal compatibility, improved reliability, and consistent performance under demanding motocross and off-road riding conditions. The cast aluminum piston construction provides excellent thermal resistance, reduced wear, and dependable operation for both recreational and competitive riders. This top end rebuild kit is an excellent choice for routine maintenance, engine refresh projects, or performance restoration. Manufactured to high-quality standards, the Athena piston kit helps maintain compression, smooth power delivery, and dependable engine response.
Restore your KTM 250 SX engine performance with the Athena P4C0664083001B Top End Piston Kit. Designed specifically for KTM 250 SX models from 2017-2022, this complete rebuild solution includes a precision-engineered 66.35 mm cast piston and matching top end gasket kit for reliable sealing and long-lasting durability. Athena develops and tests its piston technology and gasket components together to ensure optimal compatibility, improved reliability, and consistent performance under demanding motocross and off-road riding conditions. The cast aluminum piston construction provides excellent thermal resistance, reduced wear, and dependable operation for both recreational and competitive riders. This top end rebuild kit is an excellent choice for routine maintenance, engine refresh projects, or performance restoration. Manufactured to high-quality standards, the Athena piston kit helps maintain compression, smooth power delivery, and dependable engine response.
Restore your Yamaha 85 YZ engine performance with the Athena P4C0475199005A Top End Piston Kit. Designed specifically for Yamaha 85 YZ models from 2019-2023, this complete rebuild solution includes a precision-engineered 47.45 mm cast piston and matching top end gasket kit for reliable sealing and long-lasting durability. Athena develops and tests its piston technology and gasket components together to ensure optimal compatibility, improved reliability, and consistent performance under demanding motocross and off-road riding conditions. The cast aluminum piston construction provides excellent thermal resistance, reduced wear, and dependable operation for both recreational and competitive riders. This top end rebuild kit is an excellent choice for routine maintenance, engine refresh projects, or performance restoration. Manufactured to high-quality standards, the Athena piston kit helps maintain compression, smooth power delivery, and dependable engine response.
Restore your Yamaha YZ65 engine performance with the Athena P4C0435198001A Top End Piston Kit. Designed specifically for Yamaha YZ65 models from 2018-2025, this complete rebuild solution includes a precision-engineered 43.44mm cast piston and matching top end gasket kit for reliable sealing and long-lasting durability. Athena develops and tests its piston technology and gasket components together to ensure optimal compatibility, improved reliability, and consistent performance under demanding motocross and off-road riding conditions. The cast aluminum piston construction provides excellent thermal resistance, reduced wear, and dependable operation for both recreational and competitive riders. This top end rebuild kit is an excellent choice for routine maintenance, engine refresh projects, or performance restoration. Manufactured to high-quality standards, the Athena piston kit helps maintain compression, smooth power delivery, and dependable engine response.
Keep your Suzuki RM125 running cool and leak-free with the Athena P400510475002 Water Pump Repair Kit. Engineered specifically for Suzuki RM125 models from 2001-2003, this premium-quality rebuild kit includes the essential gaskets, seals, and washers required to restore proper water pump operation and cooling system performance. Athena is recognized worldwide for manufacturing high-performance motorcycle gaskets and engine components trusted by professional mechanics, motocross racers, and off-road enthusiasts. This kit is designed to deliver dependable sealing performance under demanding riding conditions while maintaining OEM-level fit and reliability. Whether you are repairing a leaking water pump, rebuilding your cooling system, or performing preventative maintenance, the Athena P400510475002 kit provides a durable and cost-effective solution for your dirt bike.
UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your modern-generation 125cc two-stroke racing engine with the Athena Big Bore Cylinder Kit (Part No. P400485100101), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 144cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a precision-machined 58mm big bore cylinder, a dedicated high-compression cylinder head, updated clearanced power valve hardware, a premium cast piston assembly, rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track performance without requiring any complex machining or structural modifications to your factory crankcase.
UPGRADE YOUR SPORT ATV TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 450cc four-stroke race-quad engine with the Athena Big Bore Cylinder Kit (Part No. P400510100008), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 490cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a widened water-jacket 100mm aluminum cylinder, a high-performance forged piston coated with molybdenum, premium rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track, trail, and dune performance without requiring any complex machining or structural engine modifications to your factory crankcase.
RESTORE YOUR SPORT ATV TO PEAK OEM PERFORMANCE Bring back the crisp throttle response, razor-sharp power delivery, and high-revving factory reliability of your 450cc race-quad engine with the Athena Standard Bore Cylinder Kit (Part No. P400510100007), a premium OEM-style replacement package engineered and manufactured in Italy. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to match or exceed original equipment standards across the entire RPM range. This complete bolt-on kit comes fully loaded with everything required for a flawless top-end rebuild—including a precision-machined 95.5mm standard bore cylinder, a high-performance forged piston assembly coated with molybdenum, premium rings, wrist pin, circlips, and a specific high-tightness gasket set—allowing you to drop compression losses and refresh your engine without requiring any custom machining or structural modifications to your factory crankcase.
RESTORE YOUR DIRT BIKE TO PEAK OEM PERFORMANCE Bring back the crisp throttle response, razor-sharp power delivery, and high-revving factory reliability of your modern 125cc two-stroke engine with the Athena Standard Bore Cylinder Kit (Part No. P400485100100), a premium OEM-style replacement package engineered and manufactured in Italy. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to match or exceed original equipment standards across the entire RPM range. This complete bolt-on kit comes fully loaded with everything required for a flawless top-end rebuild—including a precision-machined 54mm standard bore cylinder, a high-performance forged piston assembly coated with molybdenum, premium rings, wrist pin, circlips, and a specific high-tightness gasket set—allowing you to drop compression losses and refresh your engine without requiring any machining or structural engine modifications to your factory crankcase.
RESTORE YOUR DIRT BIKE TO PEAK OEM PERFORMANCE Bring back the crisp throttle response, razor-sharp power delivery, and high-revving factory reliability of your 85cc youth two-stroke engine with the Athena Standard Bore Cylinder Kit (Part No. P400485100093), a premium OEM-style replacement package engineered and manufactured in Italy. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to match or exceed original equipment standards across the entire RPM range. This complete bolt-on kit comes fully loaded with everything required for a flawless top-end rebuild—including a precision-machined 47.5mm standard bore cylinder, a high-performance premium piston assembly, rings, wrist pin, circlips, and a specific high-tightness gasket set—allowing you to drop compression losses and refresh your engine without requiring any custom machining or structural engine modifications to your factory crankcase.
UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 85cc youth two-stroke racing engine with the Athena Big Bore Cylinder Kit (Part No. P400485100038), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 105cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a precision-machined 53mm big bore cylinder, a dedicated high-compression cylinder head, a premium cast piston assembly, rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track performance without requiring any custom machining or structural engine modifications to your factory crankcase.
UPGRADE YOUR SPORT ATV TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your legendary 350cc twin-cylinder, two-stroke sport ATV with the Athena Big Bore Cylinder Kit (Part No. P400485100024), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 392cc powerhouse. Both cylinders are entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, ensuring exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict reliability. This complete bolt-on kit comes fully loaded with everything required for a flawless installation—including two precision-machined 68mm big bore cylinders, a dedicated high-compression modular aluminum cylinder head with redesigned combustion domes, dual premium cast piston assemblies, rings, wrist pins, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase sand dune and trail performance without requiring any complex machining or structural modifications to your factory crankcase.
UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your modern aluminum-frame 125cc two-stroke racing engine with the Athena Big Bore Cylinder Kit (Part No. P400485100030), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 144cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a precision-machined 58mm big bore cylinder, a dedicated high-compression cylinder head, updated clearanced power valve hardware, a premium cast piston assembly, rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track performance without requiring any complex machining or structural modifications to your factory crankcase.
UPGRADE YOUR RIDE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 250cc four-stroke engine with the Athena Big Bore Cylinder Kit (Part No. P400485100032), a premium race-proven package engineered in Italy to seamlessly convert your factory dual-sport setup into a high-revving, high-output 290cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a widened water-jacket aluminum cylinder, a high-performance forged piston coated with molybdenum, premium rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase street, trail, and track performance without requiring any complex machining or structural modifications to your factory crankcase.
RESTORE YOUR DIRT BIKE TO PEAK OEM PERFORMANCE Bring back the crisp throttle response, razor-sharp power delivery, and high-revving factory reliability of your 125cc two-stroke engine with the Athena Standard Bore Cylinder Kit (Part No. P400485100017), a premium OEM-style replacement package engineered and manufactured in Italy. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to match or exceed original equipment standards across the entire RPM range. This complete bolt-on kit comes fully loaded with everything required for a flawless top-end rebuild—including a precision-machined 54mm standard bore cylinder, a high-performance forged piston assembly coated with molybdenum, premium rings, wrist pin, circlips, and a specific high-tightness gasket set—allowing you to drop compression losses and refresh your engine without requiring any machining or structural engine modifications to your factory crankcase.
RESTORE YOUR DIRT BIKE TO PEAK OEM PERFORMANCE Bring back the crisp throttle response, razor-sharp power delivery, and high-revving factory reliability of your 125cc two-stroke engine with the Athena Standard Bore Cylinder Kit (Part No. P400485100003), a premium OEM-style replacement package engineered and manufactured in Italy. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to match or exceed original equipment standards across the entire RPM range. This complete bolt-on kit comes fully loaded with everything required for a flawless top-end rebuild—including a precision-machined 54mm standard bore cylinder, a high-performance forged piston assembly coated with molybdenum, premium rings, wrist pin, circlips, and a specific high-tightness gasket set—allowing you to drop compression losses and refresh your engine without requiring any machining or structural engine modifications to your factory crankcase.
RESTORE YOUR DIRT BIKE TO PEAK OEM PERFORMANCE Bring back the crisp throttle response, razor-sharp power delivery, and high-revving factory reliability of your 125cc two-stroke engine with the Athena Standard Bore Cylinder Kit (Part No. P400485100008), a premium OEM-style replacement package engineered and manufactured in Italy. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to match or exceed original equipment standards across the entire RPM range. This complete bolt-on kit comes fully loaded with everything required for a flawless top-end rebuild—including a precision-machined 54mm standard bore cylinder, a high-performance forged piston assembly coated with molybdenum, premium rings, wrist pin, circlips, and a specific high-tightness gasket set—allowing you to drop compression losses and refresh your engine without requiring any machining or structural engine modifications to your factory crankcase.
UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 65cc youth two-stroke racing engine with the Athena Big Bore Cylinder Kit (Part No. P400270100002), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 80cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a precision-machined 50mm big bore cylinder, a dedicated high-compression cylinder head, a premium cast piston assembly, rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track performance without requiring any machining or structural engine modifications to your factory crankcase.
UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 250cc four-stroke engine with the Athena Big Bore Cylinder Kit (Part No. P400250100030), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 300cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a widened water-jacket aluminum cylinder, a high-performance forged piston coated with molybdenum, premium rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track performance without requiring any machining or structural engine modifications to your factory crankcase.
UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 65cc youth two-stroke racing engine with the Athena Big Bore Cylinder Kit (Part No. P400250100007), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 80cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a precision-machined 50mm big bore cylinder, a dedicated high-compression cylinder head, a premium cast piston assembly, rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track performance without requiring any machining or structural engine modifications to your factory crankcase.
UPGRADE YOUR PIT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 110cc pit bike engine with the Athena Big Bore Cylinder Kit (Part No. P400250100005), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 130cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a precision-machined aluminum big bore cylinder, a high-performance forged piston coated with molybdenum, premium rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track and trail performance without requiring any machining or structural engine modifications to your factory crankcase.
UPGRADE YOUR DIRT BIKE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 125cc two-stroke racing engine with the Athena Big Bore Cylinder Kit (Part No. P400250100011), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 144cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a precision-machined 58mm big bore cylinder, a dedicated high-compression cylinder head, updated power valve hardware, a premium cast piston assembly, rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track performance without requiring any machining or structural engine modifications to your factory crankcase.
RESTORE YOUR DIRT BIKE TO PEAK OEM PERFORMANCE Bring back the crisp throttle response, razor-sharp power delivery, and high-revving factory reliability of your 65cc youth two-stroke racing engine with the Athena Standard Bore Cylinder Kit (Part No. P400250100006), a premium OEM-style replacement package engineered and manufactured in Italy. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to match or exceed original equipment standards across the entire powerband. This complete bolt-on kit comes fully loaded with everything required for a flawless top-end overhaul—including a precision-machined 44.5mm standard bore cylinder, a dedicated high-compression cylinder head, a premium cast piston assembly, rings, wrist pin, circlips, and a specific high-tightness gasket set—allowing you to drop compression losses and completely refresh your machine without requiring any custom machining or structural engine modifications to your factory crankcase.
RESTORE YOUR SPORT ATV TO PEAK OEM PERFORMANCE Bring back the crisp throttle response, razor-sharp power delivery, and factory reliability of your 450cc four-stroke sport ATV engine with the Athena Standard Bore Cylinder Kit (Part No. P400250100009), a premium OEM-style replacement package engineered and manufactured in Italy. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to match or exceed original equipment standards across the entire RPM range. This complete bolt-on kit comes fully loaded with everything required for a flawless top-end rebuild—including a precision-machined 96mm standard bore cylinder, a high-performance forged piston assembly coated with molybdenum, premium rings, wrist pin, circlips, and a specific high-tightness gasket set—allowing you to drop compression losses and refresh your engine without requiring any machining or structural engine modifications to your factory crankcase.
