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. P400485100029), 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 components, 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 engine modifications to your factory crankcase.
If you're looking to unleash more low-end torque, stronger mid-range power, and overall improved performance from your Yamaha YZ125, the Athena S4C05800001B is the perfect choice. Engineered in Italy by one of the world's leading powersports manufacturers, this high-quality cast piston kit is specifically designed to pair with Athena's Big Bore Cylinder Kits, reliably increasing your bike's displacement from 125cc. Whether you're a weekend trail rider, a competitive motocross racer, or someone who simply wants more punch out of your two-stroke, this piston delivers noticeable gains in horsepower and torque while maintaining excellent reliability and throttle response.
Keep your KTM 65 SX / XC running cool and leak-free with the Athena P400270475001 Water Pump Repair Kit. Engineered specifically for KTM 65 SX / XC models from 2003-2017, 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 P400270475001 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 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.
The Athena P400485850263 Full Gasket Kit provides a complete, high‑quality sealing solution for Yamaha YTZ250 Tri‑Z engines from 1985–1986. Manufactured with premium materials and engineered to OEM‑level specifications, this kit includes all major engine gaskets needed for a full rebuild—excluding oil seals. Designed to restore proper sealing, prevent leaks, and ensure long‑lasting durability, Athena gaskets deliver dependable performance for riders restoring or maintaining these iconic high‑performance three‑wheelers.
The Athena P400250600071 Top End Gasket Kit is engineered for Kawasaki KX‑F 250 models from 2021–2024, delivering a precise and durable sealing solution for top‑end rebuilds. This kit includes premium‑grade gaskets designed to restore compression, prevent leaks, and maintain peak engine performance under demanding motocross and off‑road conditions. Each gasket is manufactured to OEM specifications for perfect fitment and long‑term reliability. Ideal for piston replacement, routine maintenance, or full top‑end refreshes on modern high‑revving Kawasaki 250 four‑stroke engines. Oil seals are not included, allowing riders to choose preferred replacements.
The Athena P400210850204 Full Gasket Kit is engineered for Honda ATC 200 models from 1982‑1983, providing all essential gaskets needed for dependable engine servicing and rebuilds. Manufactured with premium materials and precision‑cut to meet OEM‑level specifications, this kit ensures proper sealing, durability, and long‑term performance. Ideal for restoring compression, preventing leaks, and keeping classic Honda ATC engines running smoothly. Oil seals are not included.
Keep your Yamaha 250 YZ running cool and leak-free with the Athena P400485475005 Water Pump Repair Kit. Engineered specifically for Yamaha 250 YZ models from 1999-2023, 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 P400485475004 kit provides a durable and cost-effective solution for your dirt bike.
The Athena P400210850201 Full Gasket Kit is engineered for Honda ATC 200 and TRX 200 models from 1984‑1986, providing all essential gaskets needed for dependable engine servicing and rebuilds. Manufactured with premium materials and precision‑cut to meet OEM‑level specifications, this kit ensures proper sealing, durability, and long‑term performance. Ideal for restoring compression, preventing leaks, and keeping classic Honda ATVs running strong. Oil seals are not included.
Restore your Yamaha 85 YZ engine performance with the Athena P4C0475089003B Top End Piston Kit. Designed specifically for Yamaha 85 YZ models from 2002-2018, 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.
If you're looking to unleash more low-end torque, stronger mid-range power, and overall improved performance from your Kawasaki 450 KXF, the Athena S5F09600002A is the perfect choice. Engineered in Italy by one of the world's leading powersports manufacturers, this high-quality cast piston kit is specifically designed to pair with Athena's Big Bore Cylinder Kits, reliably increasing your bike's displacement from 450cc. Whether you're a weekend trail rider, a competitive motocross racer, or someone who simply wants more punch out of your two-stroke, this piston delivers noticeable gains in horsepower and torque while maintaining excellent reliability and throttle response.
The Athena P400510850700 Full Gasket Kit provides a complete, high‑quality sealing solution for Suzuki GS750 engines from 1977–1980. Manufactured with premium materials and engineered to OEM‑level specifications, this kit includes all major engine gaskets needed for a full rebuild—excluding oil seals. Designed to restore proper sealing, prevent leaks, and ensure long‑lasting durability, Athena gaskets deliver dependable performance for riders restoring or maintaining these classic air‑cooled four‑cylinder motorcycles.
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.
The Athena P400250600026 Top End Gasket Kit is engineered for Kawasaki Vulcan 1500 models from 1996–2005, delivering a precise and durable sealing solution for top‑end engine rebuilds. This kit includes premium‑grade gaskets designed to restore compression, prevent leaks, and maintain optimal engine performance. Each gasket is manufactured to OEM specifications for perfect fitment and long‑term reliability. Ideal for routine maintenance, piston replacement, or full top‑end refreshes on Kawasaki’s powerful 1500cc V‑twin engines. Oil seals are not included, allowing riders to choose preferred replacements.
Keep your Yamaha 65 / 85 YZ running cool and leak-free with the Athena P400485475013 Water Pump Repair Kit. Engineered specifically for Yamaha 65 / 85 YZ models from 2018-2023, 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 P400485475004 kit provides a durable and cost-effective solution for your dirt bike.
The Athena P400210850130 Full Gasket Kit is engineered for Honda ATC 125 models from 1984‑1985, providing all essential gaskets needed for dependable engine servicing and rebuilds. Manufactured with premium materials and cut to OEM‑level precision, this kit ensures proper sealing, durability, and long‑term performance. Ideal for restoring compression, preventing leaks, and keeping classic ATC engines running smoothly. Oil seals are not included.
The Athena P400250600059 Top End Gasket Kit is engineered for Kawasaki KVF 300 Brute Force models, providing a durable and precise sealing solution for top‑end rebuilds. This kit includes premium‑grade gaskets designed to restore compression, prevent leaks, and maintain strong engine performance under demanding ATV conditions. Each gasket is manufactured to OEM specifications for perfect fitment and long‑term reliability. Ideal for piston replacement, routine maintenance, or full top‑end refreshes on Kawasaki’s dependable 300cc Brute Force platform. Oil seals are not included, allowing riders to choose preferred replacements.
The Athena P400210850111 Full Gasket Kit is engineered for Honda ATC 110 models from 1979‑1985, providing all essential gaskets needed for dependable engine servicing and rebuilds. Manufactured with premium materials and cut to OEM‑level precision, this kit ensures proper sealing, durability, and long‑term performance. Ideal for restoring compression, preventing leaks, and keeping classic ATC engines running smoothly. Oil seals are not included.
Keep your Kawasaki 250 KX running cool and leak-free with the Athena P400250475006 Water Pump Repair Kit. Engineered specifically for Kawasaki 250 KX models from 1999-2004, 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 P400250475006 kit provides a durable and cost-effective solution for your dirt bike.
Restore your Kawasaki 65 KX engine performance with the Athena P4C0445008001A Top End Piston Kit. Designed specifically for Kawasaki 65 KX models from 2000-2023, this complete rebuild solution includes a precision-engineered 44.45 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 KTM 300 EXC engine performance with the Athena P4C0720083002B Top End Piston Kit. Designed specifically for KTM 300 EXC models from 2017-2022, this complete rebuild solution includes a precision-engineered 71.94 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.
The Athena P400250850185 Full Gasket Kit is engineered for Kawasaki KLF185 models from 1985–1988, providing a complete and durable sealing solution for full or partial engine rebuilds. This kit includes precision‑cut gaskets for the top end, bottom end, and all major sealing points, ensuring proper fitment, leak prevention, and long‑term reliability. Manufactured to meet or exceed OEM specifications, it restores compression, cooling efficiency, and overall engine performance. Ideal for routine maintenance, engine refreshes, or full rebuilds on Kawasaki’s dependable KLF185 ATV platform. Oil seals are not included, giving riders flexibility to choose preferred replacements.
Restore your KTM / GAS GAS / HUSQ 250 engine performance with the Athena P5F0780078002A Top End Piston Kit. Designed specifically for KTM / GAS GAS / HUSQ 250 models from 2016-2022, this complete rebuild solution includes a precision-engineered 77.96 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.
Athena crankshafts are made of premium materials combined with the latest production technology. They ensure maximum performance with high-powered engines in situations of greater stress. The Athena S410485320002 Crankshaft Assembly is a high-quality direct replacement designed specifically for the Yamaha YZ85 (2002-2018). This STD crankshaft delivers superior durability, smoother power delivery, and enhanced engine longevity thanks to its race-proven engineering, improved balance, and lighter connecting rod. Whether you're rebuilding a stock engine or pushing the limits on the track, this precision-machined crankshaft helps restore or boost your bike’s performance to factory or better levels. Each assembly includes a high-performance needle bearing and special bearing cage.
