Correction:In Volume 40, Issue 7, the article entitled "Twin Cam Hop Up" used the wrong air/fuel graph and information on pages 104 and 105. This is the correct graph. Here you can see the end results: strong torque numbers right out of the hole and continuing up into the 4,000 rpm. The hp was very smooth and steadily increased well into the higher rpms. The owner stated that the bike is much more fun to ride, especially jamming around the city. Even at highway speeds, there's plenty of muscle to get around slower-moving vehicles quickly and easily.
You can also see how the Zipper's ThunderMax w/AutoTune system corrected the air/fuel mixture after the hop-up had been completed and ran in the optimal air/fuel range at around 13.5 to 1 air/fuel ratio. View Related Article
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