Rc 62 hardened sleeve

Balance Factor at 51%

Con Rod  8.0 to 8.25"

                                  CRANCSHAFT  STROKING 4.375" TO 5.0

    The crankpin will be pressed out from both of the flywheels.  Each flywheel will have a new journal hole machined and a sleeve pressed into it.  The sleeve will then be welded at its outer boundary and re-machined.  The radius of the journal will new be changed from 2.0” to 2.47” from the center of the crankshaft, which will give us 4.375 to 5.0” stroke.  

    The connecting rod comes stock at 7.666 inch center to center.  Motor strokes less than 4.75 inches can use this stock length.   However, strokes near to 5.00 require a longer connecting rod so that the side load in the piston is minimized.  Longer rods are available at EMC.  Rod length are: 8.00" , 8.125", and 8.25" .

     Each flywheel half is drilled and reamed with 3/4 diameter holes for Mallory metal ( tungsten alloy).  The necessary weights are pressed into the bob side of each flywheel side.  The balance factor is measured to within 2 grams to give a total balance factor of 51%.

     Final assembly is next.  The crankpin, it’s bearings, and the connecting rod will now be pressed into the two flywheel halves.  The assembly will be checked on an alignment inspection fixture to insure correct alignment.

Highlights:

The connecting rods are modified to longer center to center distances. (7.666" or 8.00" or 8.125" or 8.250" )

Balance factors of 51% is obtained by adding Mollory metal.

Centering alignment  of output shaft and pinion shaft are within .001"

Special fixturing built by EMC is used  for the crankshaft assembly.

Review the factory procedures as outlined in the H-D Service Manual for your motorcycle. Be careful to follow all warnings and cautions found in the Service Manual.