Reply To: ignition type on a 4hp mdl 40 Mercury

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January 6, 2022 at 11:36 am #252477
JACQUES
Participant

    I realy searched Marine engine site, google for parts on the 4hp ignition … out of interest purely.

    Can’t find much other than some older posts about the fragility of the points assembly (rocker arm and cracks within).

    I looked at various mdls finding nothing ??? serial # points to a US made engine . year unknown

    I have some .020uf mylar (630v) condensers. Mr.Mohat Outboarder article showed preferences for 800V tolerant condensers but i’ll try 630v caps ( his oscilloscope traces did not go much higher than 275V on the EMF kickback traces of the coils .

    lakes frozen solid so this will take a while to test out 🙂

    thanks all for feedback

    Joining AOMCI has priviledges 🙂

    • This reply was modified 4 years, 10 months ago by JACQUES.