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Weak spark could be multiple things.  Dirty points, Condenser on it's last legs and as you state, the coil going bad.   Do the cheap stuff first.......

  - I would first do an Ohm reading on the coil.  Sorry,  I don't know the spec off the top of my head.  Usually 2 to 4 ohms. 

- The condenser should be 0.25 uFD.   I know that because I have a real condenser tester (old school) and just bought new ones from Brillman Company in Virginia.  Also found out the rusty ones someone had in our cab were also reading good (including a old Delco-Remy one).  

- Points....  run 800 grit or higher sand paper across them.   The black colored sand paper will show a white trace if there is corrosion build up.  If you get a trace on the paper, do it again until you don't.

And finally, something you can't see on a distributor with a cap is the sign that a condenser is on it's last legs.  The points will be arcing when the engine is running.  That arcing is what destroys the points.    On things like lawnmowers, Old motorcycles, minibikes and some generators, this is a handing thing to know.

 

Tom M.

Edited by T-Mack1
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