Michaeln3162
New member
Hello and thanks
I have a 74 mercury 850.
I am having spark issues. Took the motor to the shop last year and they said the switch box was no good so I put a new cdi box and still didnt fix the issue. Motor has great compression with new ngk flat plugs. Boat will have spark when it wants to. Last week I started it 3 days in a row with no issues and now it wont start again and verified no spark. The spark is only there when it wants to be. Any ideas? wires to distributor look good and the stator on this is only for charging the battery.
I have a 74 mercury 850.
I am having spark issues. Took the motor to the shop last year and they said the switch box was no good so I put a new cdi box and still didnt fix the issue. Motor has great compression with new ngk flat plugs. Boat will have spark when it wants to. Last week I started it 3 days in a row with no issues and now it wont start again and verified no spark. The spark is only there when it wants to be. Any ideas? wires to distributor look good and the stator on this is only for charging the battery.