Valigrunt Performance

Putting the Muscle back into Classic Cars

Harley Motor upgrade

In order to stroke the motor to 103 Cubic Inches in the Harley Sportster Sport quite a bit of work went into the motor.  Once the damaged motor was removed it was machined and the bore size increased to 3.6 inches with a 5 inch stroke and then it was assembled with an S&S stroker kit giving the Harley allot more go.  Of course with the increased stroke the overall motor dimensions were also increased, making it a little tight in the frame, but all can be overcome in the pursuit of more horses.