I looking to buy a neighbors 1976 xl-250. A local shop suggested he buy a new condenser which he did and wired it to the coil. The bike started and ran fine but the new condenser was hanging from it's one lead. The owner thought he'd clean it up and drilled out the rivet that held the mount for the old condenser, popped it out, put the new one in and replaced the rivet with a nut and bolt. It was never to run again!

Q1. Did drilling our the rivet break some continuity? Can it be fixed?
Q2. Why does the condenser need only one lead? Could grounding the assy. Have caused the issue?
Q3. The coil assy. From Honda has been discontinued how can I start looking for a replacement - when buying used what should I look for to be sure it works?

Thanks!

Many Times the Capacitor(Condenser) is mounted on the points plate. Condensers need both connections solid and intact to work.
Many times the points are wired across the points and when points open capacitor discharges and fires Coil. Not sure if this is for your year.
I will be back with a Good Parts site.
Sorry the site only? Has parts and exploded diagrams from 1990 to date:
RIVA Online Original Parts Finder (http://www.rivayamaha.com/parts_finder.shtml)