Over time oxides will accumulate on the breaker points.----Many oxides do not conduct.----Cleaning will restore spark on these simple magnetos.----Much better for those that want to learn simple repair / maintenance.----Others want modern stuff that can only be maintained with an empty wallet...
Sorry----There are no shims required in many Johnson / Evinrude gearcases,----For example a 1996 30 HP.----No shims listed anywhere in the parts book !!!
A lot of this could be solved if this site forced folks to include model # / year / pictures / history of motor before questions can be submitted.------Nothing like giving advice and having poster say.----" Already did that "