Free Shipping Over $250, No Code Needed!

Notice: Product Images may differ from the actual product. Image may be a representation of this item.

Tracker Series Harley Twin Cam 106 Big Bore Tracker Piston Kit – 3.937 IN Bore

Your Price: $296.63

SKU: K0211PS

In Stock

Wiseco Tracker Series Piston Kit, 3.937 in. Bore, 10.5:1 CR

At the end of the day, it’s all about the the freedom riding gives us, which is why Wiseco believes the reliability and performance benefits of forged pistons shouldn’t have to break the budget. Enter Tracker Series, a no-frills line of pistons for Harley-Davidson engines designed to offer the forged strength Wiseco is known for at a mid-level price point. With multiple configurations available for a variety of different Harley engine platforms, Tracker Series pistons will get you to the checkers.

  • Proprietary Near-Net Forging technology reduces the amount of finish machining required, offering lower cost without sacrificing strength and longevity
  • ArmorFit skirt coating reduces operating friction and increases wear restistance for a better performaning, longer lasting part
  • Supplied in kits containing pistons, rings, wrists pins, and circlips all under one part number
  • Ring sets include 3mm oil ring assembly, providing better oil control for consistent cylinder lubrication and reduced blow-by resulting in improved durability and performance

GTIN: 00193564149268

Product Series

Tracker Series

Included Components

Piston #40211PS, Ring Set #3937VMF, Wrist Pin #S594, CirClip #W5752

Bore Diameter

3.937 IN

Piston Diameter

3.934 IN

Skirt Coating


Instructions: Enter a value in the un-shaded boxes below as they pertain to your engine.
Note: For pistons BELOW the block @ TDC – value in box must be a POSITIVE number (.000)
Note: For pistons ABOVE the block @ TDC – value in box must be a NEGATIVE number (-.000)
Note: For a DISH piston – value in box must be a POSITIVE number (0.0)
Note: For a DOME piston – value in box must be a NEGATIVE number (-0.0)
Note: Manipulate the DOME/DISH & PISTON to DECK volumes to get the ratio you want.
Enter the number of cylinders of your engine
Finished bore of your engine
Stroke of your engines crankshaft
Rod Length
Ctr. to Ctr. length of your connecting rods
Gasket Bore
Head Gasket bore diameter
Comp. Gasket
Compressed Head Gasket thickness
Block Deck Height
Center of main bearing bore to top of block
Top Ring Down
Top of 1st ring to top of pistons(FLAT)
Chamber Volume
Cylinder Head chamber volume in CC’s
Dome/Dish Volume
DOME (-) or DISH (+) vol. (theoretical) in CC’s
Piston to Deck
Top of BLOCK to top of piston (FLAT) @ TDC
Click “Calculate” for dimension results.
Total Volume
Cylinder Volume
Total cylinder volume in CC’s =
Clearance Volume
All effective vol. above block deck @ TDC in CC’s =
Gasket Volume
Volume of your head gasket in CC’s =
Top Ring Volume
Total volume above the top ring @ TDC in CC’s =
Deck Volume
Volume of area above the pistons @ TDC in CC’s =
Piston Top Land
Piston top land diameter for volume calculations =
1/2 Stroke
1/2 stroke of your engine’s crankshaft in inches =
Compression Ht.
Ctr. of piston pin to top of piston (FLAT) in inches =
Cubic Inches
Cubic inch displacement of your engine =
For the given dimensions, your compression ratio