40 hp mercury force slow cranking while plugs are in.
by jeff nolin
I have a 40 hp 1996 mercury force outboard that will hardly turn over. If I take out the plugs she spins like mad. I have checked and cleaned all connections and even switched out the starter. I bypassed all components just to make sure. I have never seen this before. Im beginning to think its an exhaust problem but not sure how to check. Any help will be appreciated.