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124" Hot Set Up Kits® Without Heads for Harley-Davidson® Twin Cam 88®/88B™ Engines

Dealer Only Item

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Year Stroke Bore Cylinder Length Piston Type/Compression Ratio
S&S Heads
S&S Heads
Stock Heads
1999-'06 4-5/8" 4-1/8" 5.013" Flat top forged/10.8:1 Flat top forged/11:1 Forged, 10.9cc dish/10.4:1
Cylinder w/piston kits include fitted pistons and cylinders that require no boring or honing.


  • 1999-2006 Twin Cam 88 Touring and Dyna® (except 2006 Dyna® models)


Features & Benefits:

  • Huge displacement increase means huge power increase
  • Stock crankcases, cylinder heads, oil pump, and cam cover can be reused, saving hundreds of dollars
  • Original engine serial numbers are retained
  • Gear drive S&S 640 Easy Start Cams included!
  • Wrinkle black (WBlack) powder coat finish heads match factory finish, giving bike a "sleeper" advantage
  • .045" MLS (multi-layered steel) head gaskets
  • Requires crankcase boring –S&S can provide quality, professional machine shop and engine building service through our remanufacturing program.
  • Adds .096" to engine height
  • Kits with S&S heads use stock length manifolds (S&S size 410)
  • Silver finish available through CTO




Requires recalibration.

Stock crankcases need to be machined to accept new cylinders. S&S can provide this service for you through the S&S® Service and Speed Center®.

S&S Easy Start Cams save you money – no need to buy compression releases or S&S rocker covers. Note when using 1999-'06 chain drive cams: For lifts over .510", S&S strongly recommends that the stock chain drive be upgraded to the S&S gear drive or to the H-D® #25284-08 or #25284-11 hybrid plate. This kit updates the problematic spring loaded chain tensioners to more reliable hydraulic tensioners and also upgrades the oil pump.

Main Bearing Note: S&S flywheel assemblies included in a 124” S&S Hot Set Up Kit® for 1999-'14 big twin engines are designed for use with Timken® sprocket shaft bearings. They will fit directly in stock 1999-’02 Harley-Davidson® crankcases and in all S&S crankcases for 1999-'14 big twin engines, with no modifications. However, stock 2003 and later engines use a roller type bearing for the sprocket shaft, and will require modification.

Due to the amount of power these engines produce with an S&S Hot Set Up Kit, S&S strongly recommends retrofitting 2003-'14 model crankcases to accept a Timken sprocket shaft bearing. A Timken conversion sleeve such as Screamin' Eagle® #34822-08 or Jim's® #956 may be used. A charging system spacer for 1999-'02 model year is also required. The S&S® Service and Speed Center® can preform this modification for you.

If you choose not to convert your crankcases to a Timken sprocket shaft bearing, S&S flywheels may be used in 2003 and later engines with the installation of the Harley-Davidson® bearing kit #24004-03B. This bearing kit adapts the S&S sprocket shaft to be compatible with stock roller type bearings. Verify that the bearing kit contains the 24604-00D or 24607-07 sprocket shaft bearing. Do not use a 24604-00, 24604-00A, 24604-00B or 24604-00C bearing. Please be advised that if this type of bearing is used, sprocket shaft bearing failure WILL NOT be covered under warranty.

Kits with S&S heads are machined special to compensate for engine height change to accomodate a stock length manifold. When using a kit with stock cylinder heads, S&S recommends using the appropriate length manifold. For a 124" with stock OEM cylinder heads, the standard manifold length is 417.

S&S can provide quality, professional machine shop and engine building service through the S&S® Service and Speed Center®. We can handle any job from fitting a set of pistons in your cylinders, to complete installation of any engine kit. Contact your S&S customer service representative for details.


Not legal for sale or use on CA or EPA pollution controlled vehicles.


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