ENGINE

Wossner

For more than 35 years, Wössner successfully design and produce high- performance pistons and connecting rods.

In order to offer their customers the best of Wössner Power, their products are produced by using state-of-the-art technology and are subject to continuous quality control.

Performance, quality and longevity - this is what Wössner stands for with high-quality products.

Needle Bearings (Little End Bearings)

Please use our Fitments Tool to ensure the correct part is ordered.

NOTE: This complete Vertex Gasket Set contains all parts as pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• One kit containing all of the gaskets, O-rings, and valve seals necessary to rebuild the entire engine and transmission.
• Includes transmission seals.

NOTE: This complete Vertex Gasket Set contains all parts as pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• One kit containing all of the gaskets, O-rings, and valve seals necessary to rebuild the entire engine and transmission.
• Includes transmission seals.

NOTE: This Vertex Top End Gasket Set contains all components pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• These sets include the head, base, and exhaust gaskets, valve seals, O-rings and other gaskets to complete a top-end rebuild.

Features:

• Direct OEM replacement.
• Matches OEM temperature specifications.
• Includes O-ring gasket when required.

Confirm suitability for your year, make, model prior to purchase.

NOTE: This Vertex Top End Gasket Set contains all components pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• These sets include the head, base, and exhaust gaskets, valve seals, O-rings and other gaskets to complete a top-end rebuild.

Vertex valves follow high-end OE specifications, using steel or titanium with a pressurised hardness treatment.

• Follows high-end OE specifications.
• High-quality steel or titanium valves.

NOTE: This complete Vertex Gasket Set contains all parts as pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• One kit containing all of the gaskets, O-rings, and valve seals necessary to rebuild the entire engine and transmission.
• Includes transmission seals.

NOTE: This Vertex Top End Gasket Set contains all components pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• These sets include the head, base, and exhaust gaskets, valve seals, O-rings and other gaskets to complete a top-end rebuild.

Wrench Rabbit Rebuild Kits have been rebranded to Vertex Rebuild Kits; all components remain unchanged however you may receive a kit that is boxed differently to the one pictured.

Vertex Complete Engine Rebuild Kits are a simple and cost-effective way to complete a top-to-bottom professional rebuild for your 2 or 4-stroke motorcycle or ATV/UTV. The one easy to order kit will not only save you time by offering a one-stop-shop in a box, but they also save you money when compared to purchasing all items individually.

Vertex kits include quality components from Vertex, Hot Rods & Hot Cams.*

All parts are manufactured in the USA from the highest quality material.

Features:

• Crafted to deliver unbeatable levels of quality
• High-grade materials for exceptional performance
• Superior in durability and reliability
• Kits available for many 2 & 4-stroke motorcycles, ATVs & UTVs
• Cost-effective solution
• Saves time sourcing individual components
• Vertex pistons & gaskets*
• Hot Rods crank & bearing kits*
• Hot Cams cam chain*

Includes:

• Crankshaft
• Piston Kit
• Complete Engine Gasket Kit
• Oil Seal Kit
• Main Bearing and Seal Kit
• Water Pump Rebuild Kit
• Transmission Bearing Kit
• Countershaft Bushing/Seal Kit
• Cam Chain

*Specific parts vary by kit (see included parts above).

Wossner is Germany's finest aftermarket forged piston and rod manufacturer and have over 25 years of experience in the high-performance racing industry. Top European racers and FIM World Champions rely on Wossner for only the best pistons, rods and customer service.

Features

• In-house designed and manufactured; all forgings are produced in Wossner's company-owned forging operation
• 4-stroke pistons are made using a double-bridged forging design
• Lightweight pistons with the tightest piston-wall clearances in the industry give you a quieter running engine
• Wossner pistons are used by leading Supercross, Arenacross and MX GP teams
• Made in Germany

Specifications

• Pist on Size: 78.96mm
• Oversize: Standard
• Ring Set: WORIK7900D

NOTE: Wossner Piston Kits include the Piston, Wrist Pin, Circlips and Rings. Needle Bearings are not included.

Includes components necessary to complete a piston (top end) rebuild. Competitive pricing, made to meet and exceed OEM quality and designed as a direct OEM replacement.

Features:

• Designed for OEM replacement.
• Made from high-quality materials.
• Meet or exceed OEM specifications.
• Competitive pricing.

Includes components necessary to complete a piston (top end) rebuild. Competitive pricing, made to meet and exceed OEM quality and designed as a direct OEM replacement.

Features:

• Designed for OEM replacement.
• Made from high-quality materials.
• Meet or exceed OEM specifications.
• Competitive pricing.

NOTE: This Vertex Top End Gasket Set contains all components pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• These sets include the head, base, and exhaust gaskets, valve seals, O-rings and other gaskets to complete a top-end rebuild.

NOTE: This Vertex Top End Gasket Set contains all components pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• These sets include the head, base, and exhaust gaskets, valve seals, O-rings and other gaskets to complete a top-end rebuild.

NOTE: This complete Vertex Gasket Set contains all parts as pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• One kit containing all of the gaskets, O-rings, and valve seals necessary to rebuild the entire engine and transmission.
• Includes transmission seals.

A Cylinder Works replacement cylinder is a completely new, not remanufactured, cast aluminium nickel silicon carbide (NSC) electroplated stock bore cylinder that appears just like an OE cylinder.

NSC is a composite of nickel and silicon carbide, providing an excellent wear-resistant surface with oil retention capabilities.

Cylinders are then diamond honed to the exact bore dimension and proper surface finish to ensure the proper ring seal and oil retention.

Features:

• Cylinder looks just like stock.
• Nickel silicon carbide plated for longer life.
• No machine work needed *
• Replacement cylinder for standard bore only.

* Honda CRF250R and CRF250X may require slight case modification. Kit comes with instructions.

Vertex valves follow high-end OE specifications, using steel or titanium with a pressurised hardness treatment.

• Follows high-end OE specifications.
• High-quality steel or titanium valves.

Wrench Rabbit Rebuild Kits have been rebranded to Vertex Rebuild Kits; all components remain unchanged however you may receive a kit that is boxed differently to the one pictured.

Vertex Complete Engine Rebuild Kits are a simple and cost-effective way to complete a top-to-bottom professional rebuild for your 2 or 4-stroke motorcycle or ATV/UTV. The one easy to order kit will not only save you time by offering a one-stop-shop in a box, but they also save you money when compared to purchasing all items individually.

Vertex kits include quality components from Vertex, Hot Rods & Hot Cams.*

All parts are manufactured in the USA from the highest quality material.

Features:

• Crafted to deliver unbeatable levels of quality
• High-grade materials for exceptional performance
• Superior in durability and reliability
• Kits available for many 2 & 4-stroke motorcycles, ATVs & UTVs
• Cost-effective solution
• Saves time sourcing individual components
• Vertex pistons & gaskets*
• Hot Rods crank & bearing kits*
• Hot Cams cam chain*

Includes:

• Crankshaft
• Piston Kit
• Complete Engine Gasket Kit
• Oil Seal Kit
• Main Bearing and Seal Kit
• Water Pump Rebuild Kit
• Transmission Bearing Kit
• Countershaft Bushing/Seal Kit
• Cam Chain

*Specific parts vary by kit (see included parts above).

NOTE: This complete Vertex Gasket Set contains all parts as pictured.

Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit.

• One kit containing all of the gaskets, O-rings, and valve seals necessary to rebuild the entire engine and transmission.
• Includes transmission seals.

Constructed using a specific heat-treatment to ensure hardness for maximum durability and less wear and precision machined to match exact sizing requirements. Each size is sold individually as a pack of 5 to reduce costs when only requiring a particular size or restocking your valve shim pack.

Most 250cc 4-strokes use 7.48 mm OD shims, most 400cc and up 4-strokes use 9.48 mm OD shims, and KTM models use 10 or 8.90 mm OD shims.

Features:

• Heat-treated ensuring hardness for maximum durability and less wear.
• Precision machined to match exact size.
• Each size sold individually to keep cost down.
• Works with stock or aftermarket cams.
• Sold as a pack of 5.
• Sizes available:
  • 7.48mm x 1.20mm - 3.50mm in 0.05mm increments
  • 9.48mm x 1.20mm - 3.50mm in 0.05mm increments

Includes components necessary to complete a piston (top end) rebuild. Competitive pricing, made to meet and exceed OEM quality and designed as a direct OEM replacement.

Features:

• Designed for OEM replacement.
• Made from high-quality materials.
• Meet or exceed OEM specifications.
• Competitive pricing.

A Cylinder Works replacement cylinder is a completely new, not remanufactured, cast aluminium nickel silicon carbide (NSC) electroplated stock bore cylinder that appears just like an OE cylinder.

NSC is a composite of nickel and silicon carbide, providing an excellent wear-resistant surface with oil retention capabilities.

Cylinders are then diamond honed to the exact bore dimension and proper surface finish to ensure the proper ring seal and oil retention.

Features:

• Cylinder looks just like stock.
• Nickel silicon carbide plated for longer life.
• No machine work needed *
• Replacement cylinder for standard bore only.

* Honda CRF250R and CRF250X may require slight case modification. Kit comes with instructions.

Wrench Rabbit Rebuild Kits have been rebranded to Vertex Rebuild Kits; all components remain unchanged however you may receive a kit that is boxed differently to the one pictured.

Vertex Complete Engine Rebuild Kits are a simple and cost-effective way to complete a top-to-bottom professional rebuild for your 2 or 4-stroke motorcycle or ATV/UTV. The one easy to order kit will not only save you time by offering a one-stop-shop in a box, but they also save you money when compared to purchasing all items individually.

Vertex kits include quality components from Vertex, Hot Rods & Hot Cams.*

All parts are manufactured in the USA from the highest quality material.

Features:

• Crafted to deliver unbeatable levels of quality
• High-grade materials for exceptional performance
• Superior in durability and reliability
• Kits available for many 2 & 4-stroke motorcycles, ATVs & UTVs
• Cost-effective solution
• Saves time sourcing individual components
• Vertex pistons & gaskets*
• Hot Rods crank & bearing kits*
• Hot Cams cam chain*

Includes:

• Crankshaft
• Piston Kit
• Complete Engine Gasket Kit
• Oil Seal Kit
• Main Bearing and Seal Kit
• Water Pump Rebuild Kit
• Transmission Bearing Kit
• Countershaft Bushing/Seal Kit
• Cam Chain

*Specific parts vary by kit (see included parts above).

Wrench Rabbit Rebuild Kits have been rebranded to Vertex Rebuild Kits; all components remain unchanged however you may receive a kit that is boxed differently to the one pictured.

Vertex Complete Engine Rebuild Kits are a simple and cost-effective way to complete a top-to-bottom professional rebuild for your 2 or 4-stroke motorcycle or ATV/UTV. The one easy to order kit will not only save you time by offering a one-stop-shop in a box, but they also save you money when compared to purchasing all items individually.

Vertex kits include quality components from Vertex, Hot Rods & Hot Cams.*

All parts are manufactured in the USA from the highest quality material.

Features:

• Crafted to deliver unbeatable levels of quality
• High-grade materials for exceptional performance
• Superior in durability and reliability
• Kits available for many 2 & 4-stroke motorcycles, ATVs & UTVs
• Cost-effective solution
• Saves time sourcing individual components
• Vertex pistons & gaskets*
• Hot Rods crank & bearing kits*
• Hot Cams cam chain*

Includes:

• Crankshaft
• Piston Kit
• Complete Engine Gasket Kit
• Oil Seal Kit
• Main Bearing and Seal Kit
• Water Pump Rebuild Kit
• Transmission Bearing Kit
• Countershaft Bushing/Seal Kit
• Cam Chain

*Specific parts vary by kit (see included parts above).

Crafted from military-spec certified TI3Al titanium alloy, Vertex Titanium Valves are made to endure the harshest racing conditions. Forged from a single blank, grain flow is improved to enhance the mechanical characteristics of the valve without having to resort to welding. Special PVD, CVD, and CrN coatings are used to provide low-friction surfaces that reduce heat generation and resist carbon build-up; coatings allow alloys like titanium to become ultra-smooth while reaching hardness levels 5x that of high-speed steel.

• Military-spec certified TI3Al titanium alloy
• Forged from a single blank
• PVD, CVD, and CrN coatings
• Reduces heat generation
• Resists carbon build-up
• Significantly stronger than steel