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VERNAFACT tm pat #5,921,211 Adjustable Interlocking Ignition Rotor Device Feature: This vernier setup allows absolute 1 degree adjustment increments with no possibility of error after installation and provides easy incremental changes for the installer / user. This system would be perfect for many automotive applications. Licensing available for automotive and other internal combustion engine applications. Contact Marc Salvisberg for additional information. Email   Adjustable Ignition Rotor Tech Factory Pro MC Apps: Honda cbr600 / 900 Kawasaki zx900/1000, ZX10, ZX11, ZX6r, ZX7r/rr, ZX9r Suzuki 92-93 gsxr600, gsxr750 93-95, gsxr1100 to 98, Bandit 600 and 1200 How do they work with no exposed screws? 1. Install the stepped set screw "C" (finger tight) into the "A" plate on right in the desired ignition timing hole. (+0° = original timing). 2. Drop large, outer "B" plate over "A" plate, with set screw lined up with the corresponding timing hole ("+0" for example). Example: +7 in the inner plate lined up with +7 on outer plate = 7 degrees advanced. -7 in the inner plate lined up with -7 on outer plate = 7 degrees retarded. To advance or retard timing 1 degree: Move screw over 1 hole on inner AND outer plate. True Rear Wheel Horsepower tm Factory EC997a Eddy Current Dynamometer