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Kuryakyn's Cheap Thrill

103 Cubes

By Toph Bocchiaro, Photography by Jordan Mastagni
Wild Things TC-2d Cam specifications
  Lift Opening Closing Duration Lobe Center
Intake .510 18 50 248 106
Exhaust .495 48 14 242 107

Squish and You:
Setting the squish is one of the most often overlooked procedures in building a performance engine. Squish is the clearance between the piston and the quench area around the combustion chamber at top dead center. More simply put, piston to head clearance.

When the piston approaches the head on the compression stroke, the air fuel mixture in the cylinder is squeezed out of the quench area towards the center of the combustion chamber. This creates a great deal of turbulence in the chamber. Turbulence is a good thing here keeping the fuel in suspension and creating a more homogenous mixture in the combustion chamber. These two things will result in a more complete burn and because the air fuel mixture is more consistent throughout the chamber, there is much less of a chance detonation will occur. Other benefits are increased power, better fuel mileage, and a crisper feeling and sounding engine.

The tighter your squish is set, the more benefits you will receive from this process. On the other hand, if your squish is set too loose, you can end up with a bike that performs poorly and has severe detonation (pinging) problems.

So how tight is too tight and how loose is too loose. For most Harleys .030-inch to .035-inch is the ideal piston to head clearance. Any closer and you run the risk of the piston hitting the head. Looser than .040-inch and the benefits of squish are lost.

Kuryakyn has raised the deck on their Wild Things pistons .015-inch to make getting that perfect .030 to .035-inch squish setting easier. Your cylinders won't need to be shortened and/or the have need for super thin head gaskets.

  • Kuryakyns Cheap Thrills Secured Cam Plate
    10. The cam plate was secured to the case and torqued to Factory specifications.
    Kuryakyns Cheap Thrills Secured Cam Plate
    10. The cam plate was secured to the case and torqued to Factory specifications.
  • Kuryakyns Cheap Thrills Primary Cam
    11. Next, Matt installed the upper primary cam sprocket and the lower crank sprocket onto their respective shafts, before fastening the hydraulic primary cam chain tensioner, followed by the chain guide.
    Kuryakyns Cheap Thrills Primary Cam
    11. Next, Matt installed the upper primary cam sprocket and the lower crank sprocket onto
  • Kuryakyns Cheap Thrills Cam Chain
    12. ...fastening the hydraulic primary cam chain tensioner, followed by the chain guide.
    Kuryakyns Cheap Thrills Cam Chain
    12. ...fastening the hydraulic primary cam chain tensioner, followed by the chain guide.
  • Kuryakyns Cheap Thrills Cam Cover
    13. All that was left to finish the cam change was to install the Cometic cam gasket and cam cover.
    Kuryakyns Cheap Thrills Cam Cover
    13. All that was left to finish the cam change was to install the Cometic cam gasket and
  • Kuryakyns Cheap Thrills Cometic Est
    14. Moving back up top, Matt placed the Cometic EST (Extreme Sealing Technology) rocker housing gaskets into place.
    Kuryakyns Cheap Thrills Cometic Est
    14. Moving back up top, Matt placed the Cometic EST (Extreme Sealing Technology) rocker h
  • Kuryakyns Cheap Thrills Rocker Housing
    15. Both rocker housings were installed and torqued.
  • Kuryakyns Cheap Thrills Pushrods
    16. Before going any further, the Comp Cams Fast Times adjustable pushrods and tubes were prepared for installation. The adjustable pushrods were slid down through the rocker housing to rest on the lifters. These stiff pushrods are made of 4130 chromoly steel tubing with 0.049-inch wall thickness. The adjuster portion is made of 4140 high-strength steel with a hardened tip. Their adjustment design allows installation without disassembling rocker boxes, if the cam chest ever has to be opened again.
    Kuryakyns Cheap Thrills Pushrods
    16. Before going any further, the Comp Cams Fast Times adjustable pushrods and tubes were
  • Kuryakyns Cheap Thrills Rocker Arm
    17. With the pushrods in place but not yet adjusted, the rocker arm support plate with the rockers was installed along with the breather assembly.
    Kuryakyns Cheap Thrills Rocker Arm
    17. With the pushrods in place but not yet adjusted, the rocker arm support plate with th
  • Kuryakyns Cheap Thrills Rocker Covers
    18. Installing both rocker covers finished up the top end.
  • Kuryakyns Cheap Thrills Locknut
    19. After successively getting each pushrod to the desired length, Matt tightened the locknut on the pushrods.
    Kuryakyns Cheap Thrills Locknut
    19. After successively getting each pushrod to the desired length, Matt tightened the loc
  • Kuryakyns Cheap Thrills Pushrod Tubes
    20. Once each pushrod was adjusted, the pushrod tubes were extended and held with the spring cap retainers. This concluded the top-end/cam change part of the installation. Pipes, airbox, and breather assembly were left to get the bike running.
    Kuryakyns Cheap Thrills Pushrod Tubes
    20. Once each pushrod was adjusted, the pushrod tubes were extended and held with the spr
  • Kuryakyns Cheap Thrills Exhaust Gaskets
    21. Kuryakyn worked with Cometic to develop the Wild Things Copper Exhaust Gaskets that won't squeeze out into the exhaust port and restrict flow. One was placed into each head and then Matt bolted on the Vance & Hines Longshots.
    Kuryakyns Cheap Thrills Exhaust Gaskets
    21. Kuryakyn worked with Cometic to develop the Wild Things Copper Exhaust Gaskets that w
By Toph Bocchiaro
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