Allesandro,

I used NX5 RS250 coils on my bike. A friend gave me an old RS250 wiring harness so I used the connectors from that. I made a simple bracket and mounted on the right side of frame with no modifications needed to the frame. I used the NSR250 spark plug caps. It all works well. I can not find the dynograph but I seem to remember I had about +0.5HP on the upper part of RPMs.

Photos:

https://www.flickr.com/photos/8517579@N08/15389858025/

Scott