not finding much info on the 30hp but if your 30 is anything like the 35hp RJE19 of 1957 it will have standard magneto
if so…. killing the engine is as simple as hooking up a normally open push button switch to the 2 points as per drawing
normally the 2 M posts on the start switch are joined inside the switch to STOP the ignition… maybe your “new wiring” is missing those connections (wires) which will do exactly the same as the above recommendation … both M posts are wired to the points to short out & kill the engine ignition system
I see you are a new member .. If not already done (sorry if I repeat myself) download your self a copy of the RED johnson service manual to service your oldy
go to
MEMEBERS ONLY TAB…INNER SANCTUM TAB …find LIBRARY… find GARRY SPENCERS DROP BOX…find the RED Book PDF & download… print locally in 2 binders of 200 pages 🙂
Joining AOMCI has priviledges 🙂
