SPI Pistons
-
$12.50$11.25Bearing – 1979-2003 Yamaha 540/570/600cc
$12.50$11.25 -
$14.95$13.46Bearing – 1986-2008 Polaris 340/600cc
$14.95$13.46 -
$14.95$13.46Bearing – 1988-2004 Arctic Cat 500-900cc
$14.95$13.46 -
$0.85$0.77C Ring – 1976-80, 1990-2000 Arctic Cat
$0.85$0.77 -
$116.95$105.26Piston Kit 1000cc, 1998-2003 Arctic Cat
$116.95$105.26 -
$84.95$76.46Piston Kit 340cc (.020 Oversize), 1978-2000 Yamaha
$84.95$76.46 -
-
$95.95$86.36Piston Kit 431cc, 1980-2000 Arctic Cat
$95.95$86.36 -
$89.95$80.96Piston Kit 488cc (.020 Oversize), 1986-2004 Polaris
$89.95$80.96 -
$89.95$80.96Piston Kit 488cc (.040 Oversize), 1986-2004 Polaris
$89.95$80.96 -
$89.95$80.96Piston Kit 497cc (.040 Oversize), 1979-2005 Ski Doo
$89.95$80.96 -
$88.95$80.06Piston Kit 500cc (.020 Oversize), 1996-2001 Ski Doo
$88.95$80.06 -
$112.95$101.66Piston Kit 500cc (.020 Oversize), 1997-2007 Polaris
$112.95$101.66
<strong>SPI Pistons:</strong> Kit includes 1 piston, 1 ring set, 1 wrist pin, and 1 circlip set.
* Engineered to provide the best possible path for combustion chamber heat transfer to the cylinder walls
* All SPI pistons, rings, pins, and circlips are manufactured to OEM specifications
* All individual components are interchangeable with original parts
* Piston weight is comparable with original piston
<strong>Features of SPI Pistons:</strong>
<strong>Machined smooth heads:</strong>
A machine smooth piston crown should reflect combustion heat while reducing carbon buildup and protecting the top of the piston. Some tests have shown that a machined smooth head can increase HP and fuel economy by up to 6%!
Hard Anodized Crowns:
Pistons that are no anodized have a hardness of HRB 60, and pistons that are anodized have a hardness of HRB 105. This makes SPI pistons 75% stronger than non-anodized pistons.
* Increased heat resistance
* Minimized piston expansion & contraction
* Reduced coefficient of friction
<strong>Hypereutectic Cast:</strong>
A hypereutectic cast piston means increased silicon content. The end result is a piston that has an increased hardness, is more resistant to wear, and has an increased ability to withstand higher cylinder temperatures, pressure, and detonation.
* Helps reduce expansion from heat
* Makes the piston more durable and resistant to wear
* Allows the piston to run tighter clearances
<strong>Teflon-Molybdenum Coating:</strong>
Many SPI pistons are T-Moly coated (Teflon-Molybdenum). MOS2 is comprised of sub-micron sized particles of solid lubricant and resin blends of solvents. This coating is rolled on, so it provides 10 times the bond strength of spray on coatings.
This coating:
* Draws heat through piston walls and out the bottom
* Reduces heat and friction, for added power and longevity
* Helps eliminate cold seizures, and increases durability