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  1. C

    lower unit swap

    I have a 1975 50 hp merc and was wanting to know what lowers would interchange i am wanting to run a 4 blade prop on a jon boat that is tiller. it has a 3 blade 13 pitch now and is way under pitched I cant seem to find any 4 blades for this lower so i was wondering if something with a different...
  2. C

    1975 merc carb problem

    this is a 20 hp merc that I cant seem to figure out. Started out cleaning the carb all looked good replaced the needle valve pumped up bulb ran pretty good but 4 times in about 10 minutes it stuttered at 3/4 to wot so when I got home I decided to check under the fly wheel as preventive maint and...
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