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2011 Polaris 800 Piston kit Dragon Switchback Pro RMK fix it kit w/ cylinder - FORGED

2011 Polaris 800 Piston kit Dragon Switchback Pro RMK fix it kit w/ cylinder

This is a complete top end piston kit for the 2011 Polaris 800 monoblock CFI Dragon / Switchback / Pro RMK / Assualt all 2011 monoblock CFI motors. This kit is designed for improving the reliability / durability of this motors design. It used .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 taller pistons, dual rings, pins, clips, wrist pin bearings, complete top end gasket kit, (factory style coated metal gaskets), machined .240" shim and the extra base gasket for the other side of the shim, Four new .240" longer bolts (not shown), as well as a remanufactured cylinder, and instructions for installation with torque values. We have this kit in our own 2009 Dragon 800 with 2900 miles on it so far, and no issues same compression as when installed. We off the same kit for the 2010 and newer, see our other auctions. Our kits come with full instructions and torque values, we offer service before, during and after the sale.

Polaris 800 CFI Motor Cylinder Casting Numbers:
2008/2009 =3021843
2010 =3022201
2011 =3022205
2011 MID - 2014 = 3022205 / 302249 / 3022352
^Could Be Any of These^
*Basic changes were cylinder skirt wall thickness*

Price Breakdown

- $419.99 for Top End & Gaskets

- $469.99 for the new cylinder

- $300 Core Fee - You WILL receive this $300 back if you send us your core!
This cylinder must be salvageable and meet cylinder exchange requirements!

Fits all Polaris two cylinder 800 monoblock motors for 2011. Call or see our other auctions for 2008-2009, 2013-15

Polaris 800 CFI fix it explanation

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 fix it kit uses a piston that sets the piston to cylinder wall clearance at .0055”. It 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. 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.

Pricing: $1,289.95

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2011 Polaris 800 Piston kit Dragon Switchback Pro RMK fix it kit w/ cylinder


  • 23428891
  • New

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  • $23.00

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