Twin Power™ advance unit screw precisely replaces H-D 3570, securing the timer assembly for accurate ignition timing on 1970-early 1979 FL/FX Big Twins and 1971-1979 XL Sportsters.
This Part Fits:
| Year |
Make |
Model |
Submodel |
| 1971-1979 |
Harley-Davidson |
FLH Electra Glide |
Base |
| 1971-1978 |
Harley-Davidson |
FX Super Glide |
Base |
| 1974-1979 |
Harley-Davidson |
FXE Super Glide |
Base |
| 1979 |
Harley-Davidson |
FXEF Fat Bob |
Base |
| 1977-1979 |
Harley-Davidson |
FXS Low Rider |
Base |
| 1971-1979 |
Harley-Davidson |
XLCH |
Base |
| 1977-1978 |
Harley-Davidson |
XLCR Cafe Racer |
Base |
| 1978-1979 |
Harley-Davidson |
XLS Roadster |
Base |
| 1977-1978 |
Harley-Davidson |
XLT |
Base |
⚠️ California Proposition 65 Warning:
This product may expose you to chemicals known to the State of California
to cause cancer or reproductive harm.
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