MCB Stage 3 rebuild kit 2012-17 Polaris 800 Switchback Pro RMK - FORGED DURABILITY KIT
2012 2013 2014 2015 Polaris 800 Piston kit Dragon Switchback Pro RMK Stage 3 rebuild kit w/ Cylinder & Crankshaft
This is an MCB Stage 3 complete engine rebuild kit for the 2012-2017 Polaris 800 k Switchback / RMK all 2012/15 monoblock CFI motors. This kit is designed for improving the reliability / durability of this engines design with a genuine MCB Durability kit, these are the best in the industry. It used our custom manufactured MCB .240" taller pistons, with tighter tolerances and less skirt taper. This reduces the piston "rock" or "slap" improving the reliability of this motor. This kit includes custom pistons, dual rings, pins, clips, wrist pin bearings, complete engine gasket kit, (factory style coated metal gaskets), machined .240" shim and the extra base gasket for the other side of the shim, eight new custom longer bolts , two taller dowel pins, as well as a re-manufactured cylinder, and instructions for installation with torque values. Stage 3 also includes a Professionally Remanufactured crankshaft fit for 2012-2015 Polaris 800!
Polaris 800 CFI Motor Cylinder Casting Numbers:
2011 MID - 2014 = 3022205 / 302249 / 3022352 / 3022828
^Could Be Any of These^
*Basic changes were cylinder skirt wall thickness*
Fits all Polaris two cylinder 800 monoblock motors for 2012/2017.
Polaris 800 CFI Durability kit info:
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"-.0011", 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. MCB Durability kit uses a piston that has significant less taper, and is .240" taller or 3.125" total height. These three factors eliminate the rock or slap described above, improving the reliability. . We also recommend 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.
- Item Requires Shipping
- 48.0 lbs.
- W24.0000” x H18.0000” x L12.0000”
Total Reviews (1)
Reviewed by: Glen02/05/2021 11:03AM
Product ownership: Less than 1 week
Purchased from: MCB Performance
Really impressed with the quality of the parts. Ring gap came within a thousandth of an inch of each other, all in spec. Great kit would definitely recommend
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