Polaris 800 AXYS and PRO-X Wossner Piston kit top end forged K7044DA-2 2016-2017

Description

MCB Performance Center
This is a premium German forged piston. This piston helps address some of the reliability issues with the Polaris 800 CFI motors. Call for more details of see our site go to the specific Polaris 800 page for explanation of the issues that need to be addressed on these models. These forged pistons have increased skirt strength to address the skirt collapse that occurs on these models. Call for additional assistance 810-395-7162
MCB Performance continues to be the leader in Powersports Engine components and is proud to be Premier Distributor of Genuine Wossner pistons.  MCB not only STOCKS these premium pistons but has also partnered with the German company in designing MCB Exclusive forgings that are being used around the world and in MCB's In-House Engine Program as an additional option to the MCB Classic series pistons we first engineered 15 years ago.  Our extensive motorsports background in conjunction with Wossners' state of the art manufacturing capabilities has been raising the powersports bar for several years now and we are excited with even more new parts in the works.
MCB/Wossner pistons are engineered unlike any other forging made in the powersports world as the materials and machining take advantage of modern FE analysis and state of the art precision machining processes. From the dead flat ring grooves to the lightening cuts and diamond honed pin bores, from the proprietary alloys ideal for cold weather useage to the premium ring sets you can count on proper fitment and incredible strength.
Simply pick one up and you will easily see and feel the pride and precision of these pistons and more importantly know that you are installing German/American quality in your engine.
- MCB Performance
(ALL) 2016-2017 Polaris 800 AXYS chassis sleds Pro-R / Pro-S / Switchback / Assualt
(Switchback) Call 810-395-7162 or see our other auctions for other years
*** PLEASE LEAVE THE EXACT YEAR/MODEL OF YOUR SLED IN THE BUYERS NOTES AT CHECKOUT ***
KIT INCLUDES:
- (2) Wossner Forged Dual-Ring Pistons
- (4) Piston Rings
- (2) Wrist Pins
- (2) sets of Circlips
- (1) COMPLETE Engine Gasket Kit specifically for 2016-17 Call for other years or see our other auctions
810-395-7162
This is a complete top end piston kit for the Polaris 800 monoblock Pro-X / Pro-S / Assualt / Indy 800 / Switchback / RMK all monoblock CFI motors 2016-17. For other years call or email us at MCB Performance
This kit is designed for improving the reliability / durability of this motors design. Our kits come with full instructions and torque values, we offer service before, during and after the sale.
Polaris 800 CFI issues explained
The stock 800 CFI motor runs a piston that is a total height of 2.885”.
The stock piston to cylinder wall clearance on the CFI motor runs from .0070”-.0090”, this is considerably larger than the typical piston to cylinder wall clearance of most other water cooled two cycle engines of .0045”.
The stock piston also has a considerably larger taper from bottom to top .0026”.
These three main factors (short piston, larger piston to cylinder wall tolerance, and larger taper top to bottom) allows the piston to rock or slap within the cylinder.
This results in premature ring wear, loss of compression and eventually piston skirt failure or cylinder skirt failure.
The MCB Wossner kit uses a piston that sets the piston to cylinder wall clearance at .0055”.
It uses a piston that has significant less taper, and has considerably stronger skirts to prevent collaspe.
These two factors eliminate the rock or slap described above, improving the reliability. Stock fuel mapping is as lean as it can be for emmissions.
This causes “hot spots” in the fuel mapping and can cause the piston to swell, this is why we run the piston to cylinder wall clearance at .0055” instead of .0045”.
We MCB recommend a slight fuel map change and the use of Ice Scratchers to optimize the cooling of the motor and eliminate the “hot spots” that can cause cold seizure like failures,
especially if ran at the tighter tolerances other than what we MCB recommend.
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We also offer a cylinder exchange program, and crankshaft remanufacturing services:
Single Cylinders
- 9.95 + Core (if applicable)
Monoblock Cylinders
- 9.95 + Core (if applicable)
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These are
MCB Dual Ring Pistons
with oiling holes.
These are OEM direct replacement, hyperutectic cast, molybdenum coated skirts, HBR103 hard anodized piston domes.
Superior durability and performance!
WHY CHOOSE THE MCB DUAL RING DESIGN?
The dual ring design improves heat transfer through the upper portion of the piston and rings, prolonging ring life, and increases the interval time for top end service significantly. These pistons provide more consistent compression, more consistent performance, no performance loss due to heat soak like the original single ring design.
This piston is an exclusive MCB design
.
MCB
is the creator of the dual ring design piston for 800R motor. We have had this design since fall 2009 and continue to make improvements. We offer the most experience and expertise on the proven dual ring design. Research our quality and reputation on Dootalk.com or Hardcoresledder.com. We have thousands of these pistons in service with incredible results. Many Ski Doo shops use our Dual ring pistons exclusively when servicing their customers sleds.
MCB's excluslive In-House LONGBLOCK engine program
-
Contact our engine dept. for details:
Message via eBay messaging system, or call (810) 395-7162
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MCB Performance Center
has been in business
since 1994
.
We do our best to make sure customers are 100% satisfied. We will help before, during, and even after the sale! We employ actual sales people and technicians that can help you.
MCB PERFORMANCE CENTER
(810) 395-7162
www.mcbperformance.com
THANK YOU FOR CHOOSING
MCB PERFORMANCE CENTER!
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QUESTIONS OR CONCERNS?
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