Technical Info...

  • These engines have many more parts than a typical V-8 car engine:
    • Removable cylinders.
    • Crankcase halves that split vertically.
    • 3 - 5 piece fully rebuildable crankshafts.
    • Almost all roller bearings.
  • They also have many trick design features:
    • Hemispherical combustion chambers.
    • Dry sump oiling system.
    • Very long connecting rods.
    • Roller crankshaft, connecting rods & lifters.
    • They are very responsive to the correct modifications and parts combinations.
  • Engine “Combinations” are correctly matched parts / modifications to deliver the performance for the dollar.
  • All cams are degreed so an engine combination performance can be accurately predicted.  Error in cam placement in the cam gear should not be placed entirely on the manufacturer as there are up to five places for manufacturing error:
    • Pinion shaft to flywheel keyways, two places for error.
    • Pinion gear to pinion shaft keyways, two more places for error.
    • Cam to cam-gear placement, the final place for error.
  • Kick-start bikes are cool as hell as long as they start... consistently.  The following are a few tips that this shop has used very successfully:
    • There are a lot of great ignitions on the market, but there are a few that consistently kick start good; Dyna ‘S’, Mallory and a good set of points / condenser.
    • Initial timing set from 5 – 8 degrees BTDC... anything more is asking for trouble.
    • Autolite copper core plugs with fairly close gaps work excellent.
    • Keep the idle speed a little low.
    • Keep the battery charge at least 12 volts.  Dynas & points can fire a few degrees early causing the dreaded back-fire.
    • Other things that can add frustrations are:
      • Different techniques for cold, warm or hot engines.
      • Plug wire type and condition.