taco eater :
Josiah McCoy from Lititz, PA United States
Got one awhile back. Never ran it but it fits perfectly in a 504's case; it uses the smaller magneto. I needed cash so had to return it but hope to pick up another one in the near future.
Also, the unit is best suited for a stock to mild street build as the cdi box has no curve or much performance tuning. But the spark and lights are wicked.
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Better Installation Method
March 19, 2014
taco eater :
Robert Smiley from Fountain Valley, CA United States
The 3/4" 8 Pt. socket by Proto (# 5424S - UPC code # 662679180768) is an asolutely perfect alignment tool for adapting the Powerdynamo ignition systems to the Derbi casings. Just drop it (opening side down) over the crank end and finger tighten the crank nut; its perfect for marking the new holes very accurately and you can do the final plate tightening with it in place, remove it then add the coil and tighten down the three Phillips screws. A strong suggestion: Ace Hardware carries button head 5mm X 12mm screws for attaching the base-plate. they are much more of a positive attachment and add clearance with the coils.
Fits a 504 case...! 
