Valigrunt Performance

Putting the Muscle back into Classic Cars

Harley Motor upgrade

December 24, 2024

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.