FastCounter by bCentral

1.

Find the motor family table

2.

Find the motor type in Column 1.

3.

Move right to confirm the connecting rod in Column 2.

4.

Confirm the stroke length in Column 3

5.

The figure in Column 4 is the rod ratio.

“Small” 4 Cam Motors

Motor

Rod

Stroke

Ratio

45 1932-73; K & KR 1952-67; Sportster 1957-85 900 & 1000cc

7.4375”

3.8125”

1.95-1

KH 1954-56

4.5625”

1.63

45 “short-rod” stroker with S&S # 7900 rods

7.113”

4.625”

1.54

KR 1968-69 Low-Boy with special short rods

6.4375”

3.8125”

1.69

XR750

2.980”

2.16

Sportster 1957-85 74” stroker

7.4375”

4.625”

1.61

Buell XB9

7.270”

3.125”

2.33

XR1000, 1983-84 Evo Sportster 883, 1100, 1200cc, Buell 1200, XB12 with XB9 rods

3.8125”

1.91

XR1000, 1983-84 Evo Sportster 883, 1100, 1200cc, Buell 1200, XB12

6.926”

1.82

Evo Sportster stroker with S&S special # 7900 rods

7.113”

4.3125”

1.65

“Big” 4 Cam Motors

Motor

Rod

Stroke

Ratio

VL 1930-36 74”*

7.6875”

4.000”

1.92*

VLH, VHS 1935-36 80”**

4.250”

1.81**

U-Series with Carrillo “SuperLong” rod

8.375”

4.28125”

1.956

U-Series 1937-48 74 & 80”

7.90625”

1.85

U-Series 84” stroker

4.500”

1.757

U-Series 86” stroker

4.625”

1.71

U-Series 88” stroker

4.750”

1.66

U-Series 92” stroker

5.000”

1.58

Single Cam OHV Motors

Motor

Rod

Stroke

Ratio

E-Series 1936-52 61”

7.46875”

3.500”

2.13

F-Series 1941-72 74”

3.96875”

1.88

F-Series 1973-80 74”

7.4375”

3.96875”

1.87

F-Series & Evo 80” 1978-*

4.250”

1.75

F-Series 84” stroker

4.500”

1.65

F-Series 86” stroker

4.625”

1.61

F-Series 88” stroker

4.750”

1.57

“Harley-Davidson” name for reference purposes only. Not affiliated with Harley-Davidson Motor Co.

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