Description
These pistons provide a compression ratio of 10.5:1 improving from the stock ratio of 9.0:1 on the Yamaha Bolt and XV950 engine models.
Wiseco leads the performance aftermarket by producing the highest quality pistons on the highest quality forgings. Wiseco is unique because we forge all of our own pistons in our USA manufacturing plant along with our own forge tooling. This allows us to control all aspects of our manufacturing process from raw bar to skirt coating finished parts. In addition, in-house dyno testing gives Wiseco the ability to develop state-of-the-art technology such as new shapes, coatings, and components, and lead the industry through rigorous R&D.
Wiseco produces high quality American made FORGED pistons, that stand up to the test of extreme racing conditions. Every Wiseco product is engineered with the most advanced technologies, for the ultimate performance and durability in all forms of PowerSports!
Powersports Forged Piston Advantage
Wiseco leads the performance aftermarket by producing the highest quality forged pistons for Dirt Bikes, ATV’s, Snowmobiles, Outboard Marine, and Motorcycles right here in the USA. Wiseco is unique because we forge all of our own pistons in house, and produce all of our own forge tooling right here in the USA. This allows us to control all aspects of our manufacturing process from raw bar to skirt coating finished parts.
In addition, in-house dyno testing gives Wiseco the ability to develop state-of-the-art technology such as new shapes, coatings, and components, and lead the industry through rigorous R&D. Linking all segments of Wiseco’s organization through design, testing, manufacturing, and distribution allows us to fulfill market needs with minimum lead-times.
Extreme racing conditions demand the strength and toughness that only forged pistons can offer. Compared to cast pistons, forgings are tougher and more durable, and will stand up to the abuse that high performance motorsport applications require. Most castings are brittle, have no grain structure and tend to fail catastrophically when the material yield strength is exceeded. Forgings have condensed grain that is aligned to the features of the part, which produces higher mechanical properties, and resistance to impact and fatigue. Each forging is designed to optimize the strength-to-weight ratio, and maximize performance.
Piston Engineering / ArmorGlide™ Coating
Wiseco’s detailed skirt shapes and profiles are very specific to each application. Variable cam programming software developed in house allows Wiseco to produce high-performance shapes unique to only Wiseco. The skirt shape (barrel/cam) is one of the most functional areas on the piston, and provides stability and smooth operation in the cylinder bore. Stability is important for proper ring seal, reduced friction, and quiet operation. Each skirt shape is designed for a specific running clearance, based on coefficient of thermal expansion of the piston alloy. Some forging alloys expand more than casting alloys, but each Wiseco piston is designed with the proper installed clearance to produce the most power, least wear, and best seal at running temperature, for each application. Comparing installed clearances on cast vs forged parts is not indicative of the running clearance at temperature. Wiseco engineers have a strong background in all forms of racing applications, and produce the best shapes and designs in the industry.
Some of our forged pistons offer our new ArmorGlide™ skirt coating, which is the result of testing, development, and benchmarking through Wiseco’s rigorous in-house dyno program. The outcome is the ultimate in skirt coating toughness, lubrication, and bond technology working together to minimize friction, maximize horsepower, and provide improved wear resistance. Not only is ArmorGlide™ a high-tech lubricant that reduces friction, but it also allows the piston to be fitted tighter within the bore allowing a better ring seal and reduced noise from piston rock.
Powersports Custom Pistons
Wiseco engineers specialize in building custom forged pistons to your exact specifications. These pistons are made using the exact same forging process as our shelf stock parts only they are built from the ground up using specifications or example pistons given by the customer. We have been making custom pistons for all segments in powersports for decades, so you can trust us with a quality build. We pride ourselves in being able to manufacture just about any piston when other companies may so no because it does not fit into their mold of manufacturing. Wiseco’s process is built to handle just about any project you can throw at us. If you would like a custom piston built please reference out customer service page and fill out a custom piston request and we will notify you with a price quote and minimum order quantity.
Top End Piston Kits
Wiseco’s complete top end Piston Kits are offered for nearly every popular application in the powersports market. These kits contain everything you need to complete your rebuild the right way, the first time. High quality parts specifically chosen by us to match our forged pistons are included in this kit for easy one stop shopping.
*Please note that a few select piston kits do not include a top end gasket or piston pin, so be sure to check our “Item Contents” tab
on the product details page to see exactly what comes in your kit.
- 2-stroke kits feature our Pro-Lite™ pistons that are CNC machined for optimal cam shape and profile for peak HP and service life.
- Each piston is built from race proven designs that are chosen by the top race teams in all forms of racing including Supercross, Motocross, GNCC, Superbike, and more.
- 4-stroke kits feature a ‘race-ready’ dome finish with smooth edges for improved combustion flow. Horizontal slot-pin oiling reduces friction and provides scuff resistance, along with a pressure seal groove for maximum ring seal.
- Most PK/SK/WK/VT kits from Wiseco feature a complete top end gasket kit that gives you everything you need to complete your rebuild from premium materials.
- 4-stroke race applications feature Wiseco’s ArmorGlide™ skirt coating to provide reduced friction and noise to contribute to increased horsepower.
- Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy.
- High Performance ring kit and alloy pin included with each piston kit for extended life and sustained power.
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