REF: Engine Control - SUB-01C


Some Sportster Ignition Modules Timing Curves

Here are some timing curves for a few Sportster Ignition Modules. The MoCo does not publish these specs.

The timing curve charts presented here are based on users using timing lights to determine the timing advance at various RPMs. Therefore, there is some variation in data where multiple people have taken readings for the same module. The charts should be a resonable approximation. (Click an image for a larger view.)

SE 'K' Curve (1200):
The data in this chart is based on the Battle2Win(v2i2) magazine article by Kip Woodring.


OEM 'M' Curve (1200):
The data in this chart is based on the Battle2Win(v2i2) magazine article by Kip Woodring.


OEM 'Q' Curve (1200):
The data in this chart is based on the Battle2Win(v2i2) magazine article by Kip Woodring.


Comparison of 'R' Curve (883) and 'Q' Curve (1200):
This chart was originally published by Maurice Riggens at the old Sportster.org website.


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