Wossner

The Wossner 8941DC piston kit offers a forged high-performance solution with an 88.00mm standard bore and a measured diameter of 87.97mm, providing a +0.02mm sizing option. Designed for KTM and Husqvarna 350cc models, this piston enhances durability and efficiency through superior engineering and heat management. Manufactured in Germany, the elliptical design ensures consistent load distribution under thermal expansion. Features Forged piston for maximum strength and endurance Optimised heat transfer from combustion chamber to cylinder walls Elliptically designed for even expansion and pressure distribution Helps prevent piston collapse under load Includes piston, rings (880XSY), pin (WP054), and circlips (CW18) Specifications Bore: 88.00mm (STD) Diameter: 87.97mm Sizing: C (+0.02mm) Compression Ratio: 12.5:1 Wossner Part Number: 8941DC Kit Part Number: 56-W9950.C.WO Made in Germany Cross-Reference OEM Part Numbers RINGS: 880XSY PIN: WP054 CLIPS: CW18 Vehicle Fitments KTM 350 EXC-F 2017 - 2018 Husqvarna FE350 2017 - 2018 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years KTM EXC F 350 2017-2019 KTM EXC F 350 2017

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The Wossner 8941DB piston kit is a forged performance upgrade featuring a 88.00mm standard bore with a measured diameter of 87.96mm, offering a +0.01mm sizing option. It is precision-engineered for KTM and Husqvarna 350cc models and provides exceptional strength, uniform expansion, and efficient thermal conductivity. Made in Germany, the piston design enhances durability under thermal load conditions. Features Forged construction for increased strength and reliability Engineered for effective combustion heat transfer to cylinder walls Elliptical shape ensures uniform bearing surface during thermal expansion Minimises localised stress and prevents piston collapse Includes piston, rings (880XSY), pin (WP054), and circlips (CW18) Specifications Bore: 88.00mm (STD) Diameter: 87.96mm Sizing: B (+0.01mm) Compression Ratio: 12.5:1 Wossner Part Number: 8941DB Kit Part Number: 56-W9950.B.WO Made in Germany Cross-Reference OEM Part Numbers RINGS: 880XSY PIN: WP054 CLIPS: CW18 Vehicle Fitments KTM 350 EXC-F 2017 - 2018 Husqvarna FE350 2017 - 2018 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years KTM EXC F 350 2017-2019 KTM EXC F 350 2017

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The Wossner 8941DA piston kit is a forged, high-performance component engineered for precision and durability in 4-stroke off-road motorcycles. Designed with an 88.00mm standard bore and a compression ratio of 12.5:1, it ensures efficient heat transfer and optimal combustion. Manufactured in Germany, the piston’s elliptical design supports uniform expansion under thermal stress, preventing localised pressure points and piston failure. Features Forged piston construction for enhanced strength Optimised combustion heat transfer to cylinder walls Elliptical shape for even pressure distribution and thrust load balance Designed to prevent piston collapse Includes piston, rings (880XSY), pin (WP054), and circlips (CW18) Specifications Bore: 88.00mm (STD) Diameter: 87.95mm Compression Ratio: 12.5:1 Wossner Part Number: 8941DA Kit Part Number: 56-W9950.A.WO Made in Germany Cross-Reference OEM Part Numbers 79230507000 40166M08800 Vehicle Fitments KTM 350 EXC-F 2017 - 2018 Husqvarna FE350 2017 - 2018 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years KTM EXC F 350 2017-2019 KTM EXC F 350 2017

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This Wossner forged piston kit is tailored for the 2017 Honda CRF450R, offering a high-compression setup with a 96.02mm bore and 95.97mm piston size (+0.02 oversize). Engineered for optimal performance and durability, it features advanced heat dissipation and structural integrity, making it suitable for high-stress racing applications. Manufactured in Germany, the kit includes all required installation components. Features High-compression design (14:1) for race-level performance Forged construction for enhanced strength and reliability Elliptical profile promotes uniform heat expansion and load distribution Efficient heat transfer from combustion chamber to cylinder walls Includes piston, rings, pin, and circlips Requires NGK spark plug R0465B-10 Specifications Bore size: 96.02mm (+0.02 oversize) Piston size: 95.97mm Compression ratio: 14:1 Part number: 8937DC Wossner kit part number: 56-W9949.C.WO.H Cross-Reference OEM Part Numbers RIK96.00E WP028 CW19 13101-MKE-A00 13011-MKE-A00 13111-MKE-A01 13112-MKE-A00 Vehicle Fitments Honda CRF450R (2017) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years HONDA CRF RX 450 2017-2018 HONDA CRF R 450 2017-2018 HONDA CRF RX 450 2017-2019 HONDA CRF RX 450 2017-2020 HONDA CRF R 450 2017-2019 HONDA CRF R 450 2017-2020 HONDA CRF RX 450 2017-2021 HONDA CRF R 450 2017-2021

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Piston kit 96.02mm Bore 95.97mm Wossner    8936DC (+0.02) HONDA CRF450R 2017-2013, Wossner forged pistons are superior in strength and design. Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls. Elliptically designed to provide a more uniform bearing surface under piston heat expansion, eliminating localized pressure and distributing thrust loads more evenly, thereby preventing piston collapse. Made in Germany Part No. 56-W9949.C.WO (radhouse.co.uk) HONDA CRF450R 2017, WOSSNER 8936DC STD BORE 96.00mm C Piston Kit 96mm Std. Bore 13.5:1 Compression. Piston includes piston, rings, pin, and circlips. Ring set - RIK96.00E, Pin - WP028, clips - CW19 Wossner is the innovative specialist for high performance pistons and cylinder blocks. Wossner products are to be found in engines operating at the highest levels of motor sport competition and in everyday use.Wossner products are the source of the superior power behind the success of well known motor sport teams at national and international race meets. Cross reference numbers ONLY. RIK96.00E, WP028, CW19, 13101-MKE-A00, 13011-MKE-A00, 13111 -MKE-A01, 13112-MKE-A00 ,   Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years HONDA CRF RX 450 2017-2018 HONDA CRF R 450 2017-2018 HONDA CRF RX 450 2017-2019 HONDA CRF RX 450 2017-2020 HONDA CRF R 450 2017-2019 HONDA CRF R 450 2017-2020 HONDA CRF RX 450 2017-2021 HONDA CRF R 450 2017-2021

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This Wossner forged piston kit is engineered for the 2017 Honda CRF450R, featuring a high-compression 14:1 design with a 96.01mm bore and 95.96mm piston size (+0.01 oversize). Designed for performance and durability, it ensures efficient heat transfer and load distribution in high-stress environments. The kit includes all necessary installation components and is precision-made in Germany. Features High-compression design (14:1) for performance enhancement Forged piston construction for superior strength and resilience Elliptical design ensures uniform bearing surface under heat expansion Efficient heat transfer from combustion chamber to cylinder walls Includes piston, rings, pin, and circlips Must be used with NGK spark plug R0465B-10 Specifications Bore size: 96.01mm (+0.01 oversize) Piston size: 95.96mm Compression ratio: 14:1 Part number: 8937DB Wossner kit part number: 56-W9949.B.WO.H Cross-Reference OEM Part Numbers RIK96.00E WP028 CW19 13101-MKE-A00 13011-MKE-A00 13111-MKE-A01 13112-MKE-A00 Vehicle Fitments Honda CRF450R (2017) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years HONDA CRF RX 450 2017-2018 HONDA CRF R 450 2017-2018 HONDA CRF RX 450 2017-2019 HONDA CRF RX 450 2017-2020 HONDA CRF R 450 2017-2019 HONDA CRF R 450 2017-2020 HONDA CRF RX 450 2017-2021 HONDA CRF R 450 2017-2021

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This Wossner forged piston kit is designed specifically for the 2017 Honda CRF450R, offering a high-compression setup with a 96mm standard bore. Manufactured in Germany, this piston delivers superior strength and heat management for demanding race and performance applications. Engineered for precise thermal expansion and even load distribution, it includes all essential components for installation. Features High-compression design (14:1) for enhanced performance Forged construction for superior strength and durability Elliptical shape for even thrust load distribution and minimised piston collapse Optimised heat transfer from the combustion chamber to cylinder walls Includes piston, rings, pin, and circlips Must be used with NGK spark plug R0465B-10 Specifications Bore size: 96.00mm (Standard) Piston size: 95.95mm Compression ratio: 14:1 Part number: 8937DA Wossner kit part number: 56-W9949.A.WO.H Cross-Reference OEM Part Numbers RIK96.00E WP028 CW19 13101-MKE-A00 13011-MKE-A00 13111-MKE-A01 13112-MKE-A00 Vehicle Fitments Honda CRF450R (2017) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years HONDA CRF RX 450 2017-2018 HONDA CRF R 450 2017-2018 HONDA CRF RX 450 2017-2019 HONDA CRF RX 450 2017-2020 HONDA CRF R 450 2017-2019 HONDA CRF R 450 2017-2020 HONDA CRF RX 450 2017-2021 HONDA CRF R 450 2017-2021

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Piston kit 96mm Bore 95.95mm Wossner    8936DA (STD) HONDA CRF450R 2017-2023, CRF450RX 2017, Wossner forged pistons are superior in strength and design. Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls. Elliptically designed to provide a more uniform bearing surface under piston heat expansion, eliminating localized pressure and distributing thrust loads more evenly, thereby preventing piston collapse. Made in Germany Part No. 56-W9949.A.WO (radhouse.co.uk) HONDA CRF450R 2017, WOSSNER 8936DA STD BORE 96.00mm A Piston Kit 96mm Std. Bore 13.5:1 Compression. Piston includes piston, rings, pin, and circlips. Ring set - RIK96.00E, Pin - WP028, clips - CW19 Cross reference numbers ONLY. 13110-MKE-A00, 40177M09600 Wossner is the innovative specialist for high performance pistons and cylinder blocks. Wossner products are to be found in engines operating at the highest levels of motor sport competition and in everyday use.Wossner products are the source of the superior power behind the success of well known motor sport teams at national and international race meets. Cross reference numbers ONLY. RIK96.00E, WP028, CW19, 13101-MKE-A00, 13011-MKE-A00, 13111 -MKE-A01, 13112-MKE-A00 ,   Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years HONDA CRF RX 450 2017-2018 HONDA CRF R 450 2017-2018 HONDA CRF RX 450 2017-2019 HONDA CRF RX 450 2017-2020 HONDA CRF R 450 2017-2019 HONDA CRF R 450 2017-2020 HONDA CRF RX 450 2017-2021 HONDA CRF R 450 2017-2021

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This Wossner piston kit is built for Harley Davidson Twin Cam 88 Big Bore engines (1999–2006), offering a standard bore for 1650cc configurations. With a focus on thermal efficiency and mechanical strength, the forged pistons provide reliable performance under high-stress engine conditions. Manufactured in Germany, the kit includes a full set of components required for installation. Features Wossner forged pistons engineered for strength and high-performance endurance Superior heat transfer from combustion chamber to cylinder walls Elliptical piston design ensures uniform bearing surface during expansion Prevents localised stress and piston failure by evenly distributing thrust loads Complete with rings, pins, and circlips Made in Germany Specifications Bore Size: 101.60mm (actual: 101.54mm) Compression Ratio: 10:1 Compression Height: 32.3mm Piston Kit: Set of 2 Cross-Reference OEM Part Numbers 56-W9943.000.WO Wossner K8634DA-2 Clip/Lock: C23x1.6 Pin: WP056 Ring Set: 1016XSU Vehicle Fitments Harley Davidson Twin Cam 88 Big Bore (1999–2006) – 1650cc

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This Wossner piston kit is specifically designed for Harley Davidson 1200 Buell XB12R Firebolt and XB12S Lightning models from 2004 to 2007. The kit features forged pistons known for their strength, precise thermal expansion handling, and effective heat dissipation. Manufactured in Germany, this standard bore kit comes complete with essential installation components for reliable engine performance. Features High-strength Wossner forged pistons for durability under high-stress conditions Efficient heat transfer from the combustion chamber to cylinder walls Elliptical piston design ensures uniform bearing surface during heat expansion Prevents localised pressure points and piston collapse Supplied with rings, pins, and circlips Made in Germany Specifications Bore Size: 89.00mm (actual: 88.95mm) Compression Ratio: 12:1 Compression Height: 30.7mm Piston Kit: Set of 2 Cross-Reference OEM Part Numbers 56-W9942.000.WO Wossner K8626DA-2 Ring Set: 890XSY Clip/Lock: CW20 Pin: WP021 Vehicle Fitments Harley Davidson 1200 Buell XB12R Firebolt (2004–2007) Harley Davidson 1200 XB12S Lightning (2004–2007) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years HARLEY DAVIDSON BUELL 1200 2004-2007

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This Wossner piston kit is designed for Harley Davidson 1200–1228cc engines, including the S1 White Lightning, Thunderbolt, and Buell models. Engineered for performance, the forged pistons ensure efficient heat transfer and even thrust load distribution, minimising piston distortion under high stress. Manufactured in Germany, this set includes two pistons and all required installation components. Features High-performance Wossner forged pistons Enhanced heat transfer from combustion chamber to cylinder walls Elliptical design for uniform bearing surface during thermal expansion Prevents localised pressure points and piston collapse Complete kit with rings, pins, and circlips Made in Germany Specifications Bore Size: 90.00mm (actual: 89.95mm) Compression Ratio: 10:1 Compression Height: 30.7mm Piston Kit: Set of 2 Cross-Reference OEM Part Numbers 56-W9941.100.WO Wossner K8625D100-2 Vehicle Fitments Harley Davidson S1 White Lightning 1200–1228cc Harley Davidson Thunderbolt 1200–1228cc Harley Davidson Buell 1200–1228cc

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This Wossner K8625D050-2 piston kit is a high-performance forged set engineered for Harley Davidson 1200–1228cc engines. With an oversize bore of 89.50mm (+0.50mm), it is designed for optimised heat transfer, improved durability, and consistent performance under extreme conditions. Manufactured in Germany, this kit is suitable for demanding applications including motorsport. Features Forged piston construction offering high strength and durability Elliptical design ensures even load distribution under thermal expansion Maximises heat dissipation from combustion chamber to cylinder walls Includes pistons, rings, pins, and circlips for complete installation Designed for competition-level performance Made in Germany Specifications Bore Size: 89.50mm (Piston Diameter: 89.45mm) Compression Ratio: 10:1 Compression Height: 30.7mm Quantity: Set of 2 pistons Wossner Part Number: K8625D050-2 Reference Part Number: 56-W9941.050.WO Cross-Reference OEM Part Numbers Wossner K8625D050-2 56-W9941.050.WO Vehicle Fitments Harley Davidson S1 White Lightning 1200–1228cc Harley Davidson Thunderbolt 1200–1228cc Harley Davidson Buell 1200–1228cc

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This Wossner piston kit includes two forged pistons with a standard 89.00mm bore and a measured diameter of 88.95mm. Designed for Harley Davidson 1200–1228cc engines, including S1 White Lightning, Thunderbolt, and Buell models, this kit offers a high-strength, high-compression solution for performance applications. Features Forged construction for enhanced durability and strength Optimized heat transfer from combustion chamber to cylinder walls Elliptical design ensures uniform bearing surface during heat expansion Even distribution of thrust loads prevents localised pressure and piston collapse Manufactured in Germany Supplied as a complete set of 2 pistons, rings, pins, and circlips Specifications Bore: 89.00mm Diameter: 88.95mm Compression Ratio: 10:1 Compression Height: 30.7mm Cross-Reference OEM Part Numbers Part No. 56-W9941.000.WO Wossner Piston K8625DA-2 Vehicle Fitments Harley Davidson S1 White Lightning 1200–1228cc Harley Davidson Thunderbolt 1200–1228cc Harley Davidson Buell 1200–1228cc

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This Wossner piston kit includes two forged domed pistons with a standard 97.00mm bore and a measured diameter of 96.94mm. Designed for 1170cc Harley Davidson Buell XB9R Firebolt and XB9S Lightning models, this high-compression piston set is engineered for optimal power delivery and durability in performance applications. Features Forged piston construction ensures superior strength and longevity Engineered for effective combustion chamber heat transfer to cylinder walls Elliptical design promotes uniform bearing surface under heat expansion Even distribution of thrust loads helps prevent piston collapse Manufactured in Germany Domed design for high-compression applications Specifications Bore: 97.00mm Diameter: 96.94mm Compression Ratio: 12.3:1 Kit Includes: 2 pistons, rings, pins, and circlips Cross-Reference OEM Part Numbers Part No. 56-W9940.000.WO Wossner Piston K8624DA-2 Vehicle Fitments Harley Davidson Buell XB9R Firebolt 1170cc Harley Davidson Buell XB9S Lightning 1170cc

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PISTON KIT 80mm, BORE SIZE 79.95mm WOSSNER SET/2  K8971DA-2 (STD) YAMAHA FZ-07 2015 - 2017 MT-07 2018 - 2021 XSR 700 2018 - 2021 TENERE 700 2021 - 2023 YZF-R7 2022 - 2023 Wossner forged pistons are superior in strength and design. Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls. Elliptically designed to provide a more uniform bearing surface under piston heat expansion, eliminating localized pressure and distributing thrust loads more evenly, thereby preventing piston collapse. Made in Germany. Part No. 56-W9939.000.WO (radhouse.co.uk) PISTON KIT SET/2 WOSSNER K8971DA-2   

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Piston kit 82.90mm Bore Wossner 8296D100 (+1mm) KTM 400 1976 - 1981,   Wossner forged pistons are superior in strength and design. Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls. Elliptically designed to provide a more uniform bearing surface under piston heat expansion, eliminating localized pressure and distributing thrust loads more evenly, thereby preventing piston collapse. Made in Germany Part No. 56-W9938.100.WO (radhouse.co.uk) KTM 400, WOSSNER 8296D100 PISTON KIT. SIZE BORE 81.90mm 1.00mm O/S Wossner high performance forged pistons, are world leaders in piston research and development. As used by many race teams Wossner forged pistons are designed to operate at the highest levels of motorsport and competition. You can have confidence in your engine when you are running Wossner pistons. Wossner piston kits come complete with rings,pins and circlips ready for fitting.   Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years KTM GS F 400 1976-1981

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Piston kit 82.40mm Bore Wossner 8296D050 (+0.50mm) KTM 400 1976 - 1981, Wossner forged pistons are superior in strength and design. Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls. Elliptically designed to provide a more uniform bearing surface under piston heat expansion, eliminating localized pressure and distributing thrust loads more evenly, thereby preventing piston collapse. Made in Germany Part No. 56-W9938.050.WO (radhouse.co.uk) KTM 400 1976 - 1981, WOSSNER 8296D050 PISTON KIT. SIZE BORE 81.40mm 0.50mm O/S Wossner high performance forged pistons, are world leaders in piston research and development. As used by many race teams Wossner forged pistons are designed to operate at the highest levels of motorsport and competition. You can have confidence in your engine when you are running Wossner pistons. Wossner piston kits come complete with rings,pins and circlips ready for fitting.   Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years KTM GS F 400 1976-1981

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This Wossner piston kit features a 55.00mm bore, providing a +1.00mm oversize fitment for the ROTAX SWM 125 models produced between 1978 and 1982. Built with forged construction, this piston is engineered for durability, efficient heat transfer, and optimal performance in two-stroke engine configurations. Features Forged construction for enhanced strength and long-term durability Designed for efficient combustion chamber heat dissipation to cylinder walls Elliptical shape ensures uniform bearing surface during thermal expansion Even distribution of thrust loads reduces risk of piston collapse Manufactured in Germany Supplied complete with rings, pins, and circlips Specifications Bore: 55.00mm Cross-Reference OEM Part Numbers Part No. 56-W9937.100.WO Wossner Piston 8288D100 Vehicle Fitments ROTAX SWM 125 1978–1982 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years ROTAX SWM 125 1978-1982

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This Wossner piston kit set includes three forged pistons with a 68.50mm bore and a measured diameter of 68.45mm, offering a +1.00mm oversize fitment for the Triumph Trident 750cc engine. Designed for durability and high thermal efficiency, these pistons provide enhanced reliability and performance for classic three-cylinder applications. Features Forged piston construction for superior strength and durability Engineered for efficient heat dissipation from combustion chamber to cylinder walls Elliptical profile ensures uniform bearing surface under thermal expansion Even thrust load distribution prevents localised pressure and piston collapse Manufactured in Germany Complete set includes 3 pistons, rings, pins, and circlips Specifications Bore: 68.50mm Diameter: 68.45mm Cross-Reference OEM Part Numbers Part No. 56-W9936.100.WO Wossner Piston K8809D100-3 Vehicle Fitments Triumph Trident 750cc

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This Wossner piston kit set includes four forged pistons with a 73.00mm bore and 72.94mm diameter, offering a +3.5mm oversize fitment for Kawasaki KZ1000J and KZ1000R models from 1981 to 1983. Engineered for increased displacement and improved compression, this kit enhances engine performance while maintaining structural reliability under demanding conditions. Features Forged piston construction ensures superior strength and durability Optimised for efficient combustion chamber heat transfer to cylinder walls Elliptical profile promotes uniform bearing surface under heat expansion Reduces localised pressure and distributes thrust loads evenly to prevent piston collapse Manufactured in Germany Complete kit includes 4 pistons, pins, rings, and circlips Specifications Bore: 73.00mm Diameter: 72.94mm Engine Displacement: 1075 / 1105 cm³ Stroke: 66.00 mm Clearance: 0.06 mm Compression Ratio (Wossner): 1075 cc = 10.30:1 / 1105 cc = 10.50:1 Compression Ratio (OEM): 9.20:1 Dome Volume: 18.80 cm³ Compression Height: 25.30 mm Theoretical Weight: 25.30 g Engine Cylinders: 4 Clips P/N: CW17 Pin P/N: WP083 Ring Set P/N: 730XDS Cross-Reference OEM Part Numbers Part No. 56-W9934.350.WO Wossner Piston K8796D350-4 Vehicle Fitments Kawasaki KZ1000J 1981–1983 Kawasaki KZ1000R 1981–1983

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