This is the LEAST EXPENSIVE and BEST option for addressing this issue!! With this 800 CFI engine (Pro or AXYS), the lower half of the engine is dry.. meaning there is little to no fuel entering there. This is a full top end kit that is essentially an install and go kind of kit. BEST PART: NO AFTERMARKET PIPE, Fuel controller, OR anything else is needed! 714-369-8547 or 714-369-8879 sales@wossnerpistons.com Each kit includes information sheets with info on how to properly break in your new top end. FOR SALE! We have found it common to see the piston to cylinder wall clearance DOUBLE in less than 1000 miles.. THIS is the #1 reason behind these cylinder failures associated with the Polaris Engine!! Remember this, VERY IMPORTANT, a compression check will tell you little to nothing about the health of your skirts. $2194.99. Less Stress = More longevity and more power! It is a widely held belief that the OEM pistons are too small from the factory and this is where the issues lie. While we can not address ALL the issues we see with this engine we can address a very big one in the piston design.. and that is what we have done with this offering. If you are looking to take it to the next level...Look for the 858 Big Bore Kit OR the DROP IN KIT, RK Tek is located in Preston, Idaho and is owned and operated by Kelsey and Rex (hence RK). select your ride Results per Page. They will NOT fail unless they are subjected to a low fuel or high heat condition! Please see below to learn more about our solution! CORE (CHARGE IS REFUNDED WHEN WE GET THE CORE). They require ZERO added "treatment"! Additional Information. Extra case welding charges do apply, starting from $125 - $350. The truth is that the OEM piston's tolerances are in spec, they just don't stay there. Add to Cart 2018-20 Polaris 800 Axys Single pipe Ceramic Coated Part # 132-134 $ 549.95. OEM Replacement This part is aftermarket equipment designed to replace the original manufacturer's part numbers specified here. FUEL (NOT COOLANT) is the #1 cooling agent for ANY Engine (important to remember) and this engine has none! MUCH Smoother running at ALL RPM.. Piston side loading is reduced due to our unique piston's weight. Many people now know that the stock pistons are just too short and wear out too fast. Heat is one of the primary causes of skirt collapse and skirt collapse is ONE of the primary issues with the OEM design.. Polaris Indy Pistons & Piston Rings. We, purposely, designed this kit to perform using the components! MCB Performance continues to be the leader in Powersports Engine components and is proud to be Premier Distributor of Genuine Wossner pistons. Find Parts Fast. We have been designing our own pistons since 2005. Speedwerx Standard Lightweight and L2 Series Mufflers for the Polaris 850 are now available! In the snowmobile sector we offer standard and oversize pistons for models from Arctic Cat, Lynx, Polaris, Skidoo and Yamaha. For 2017, the AXYS-inspired design creates a 10” narrower sled body for better rider mobility and tighter cornering capabilities. It is SOLELY related to excessive piston to cylinder wall clearance! Their service is great and prices affordable. 1) The 600 Polaris Engine is a great engine!.. MCB Stage 1 Polaris AXYS 850 2017-2020 Piston Kit Top End Rebuild Kit with Cylinder (0) Reviews: Write first review Description: GENUINE MCB Top end rebuild kit WITH OEM Polaris Cylinder. The piston we use is VERY CUSTOM! (2015 Polaris RMK 800 cfi2, stock made 146hp on that dyno) The kit simply addresses the issues associated with the stock (OEM) Piston. There is no RPM change with this kit. (ALL) 2016-2017 Polaris 800 AXYS chassis sleds Pro-R / Pro-S / Switchback / Assualt. Piston upgrade  - as of 3/24/15 all motors will come with the new updated OEM Polaris pistons. 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