Re: 1948 Evinrude Light Four with no spark…need advice

[jeff-register]

Your caps are bad I bet. An analog meter will not show leakage or capacity of the cap. Also your replacement caps should be rated at 800 volts & are very important how fast the cap accepts & discharges. Most 400 volt caps have a slower rate & will fail in time. The cap is rated in Dv/Dt1000 or higher & the dissipation factor of 0.05% or LESS!! manufactureswho make caps that perform with high Dv/Dt’s will have that parameter in the description, if not it is not there it is safe to assume the cap is for general use & will not last in a magneto. G o to Newark.com & in the part box type in mkp1839 084hq. These caps are rated for a magneto. Be sure not to forget the suffex hq as it means high quality. I have researched this very much & electronics is my hobby. Vishay is the brand cap. You must mount them in your can but they fit most cans. Anything less & you are asking for failure. 😉 P.S. you need a Merc o tronic or Stevens cap tester for good test data. Check your service manual for placement. I have one & can scan & send the pages needed if needed. jeff.50@cox.net.