The MTNTK Fix Kit

The MTNTK “FIX KIT” or “DURABILITY KIT” is the proven solution to the piston failure that is common in the 2008 to 2014 POLARIS 800 engine. The failure is caused by the piston clearance in the cylinder being loose and allowing the pistons to rock in the cylinder bore. With that rock or “piston slap” the pistons scrape the cylinder wall and remove the oil film from the cylinder wall. As the pistons continue to scrape they begin to cause damage to the pistons, rings, and the cylinder. “Piston slap” also causes the pistons to develop a knifed edge and the piston skirts/cylinder skirts to fatigue. As this happens the engine will begin to loose compression and begin experiencing “bog” issues, and as it worsens it will begin to idle poorly and not switch into reverse. The engine failure can take time and show all of these signs or can go quickly without notice. The MTNTK “FIX KIT” is designed to eliminate the piston slap issue. By adding a cylinder shim it allows us to increase the height of