2 dead HSUNS, could use some help please

[FastDoc]

Strange.

My buddy's HSUN with 150 KM on the clock would quit while riding randomly and intermittently. It would die while riding or idiling or even switching gears. Sometimes it would restart, sometimes not. When it died it would be like you turned off the key. Tach goes to zero instantly. Lights stay on. A couple days ago I could not get it to start. Checked the spark it had none. Called SunnySports for a new CDI on an educated guess of the problem.

Rechecked the spark a few days later and it was there. Put the plug back in and it started, only to quit shortly afterwards and not restart. Recked for spark and there was none.

My bike, with 1500 off road KM's is starting to do the same thing, but less pronounced at this point.

I was riding it a little yesterday. 5th gear at 40 MPH and it just 'turned off' I was lucky and it restarted right away. I have noticed as of late a momentary quitting, as if someone touched the kill switch, as constant low speed, like trolling through the main street of a little town.

Any thoughts? I'm not in the mood to break down somewhere in the desert anytime soon.

I'm thinking of ordering a couple of those -performance' CDI's off Ebay.