Hi I recently got a boat with a red band 75hp mercury outboard on the back. Was told it has a slight miss and needed to sort it out. So I've tested it and the miss stopped it revving past 3000rpm when under load. I have done compression test and all were 142-151psi.
have done a spark test and here is what I found. Only cylinder number 1 was sparking so I messed around with the leads and plugs until I checked them all on the good coil and all tested ok then i got spark on 1 and 2. So I thought it was the coils. Pulled coils off and rearranged the order of them to try the dead coils in the good coils position and success those coils sparked so I'm thinking coils leads and plugs are all good...
what's the most likely problem? The stator, trigger or power pack? How do I test the 3 to save me buying parts I dont need.
any tips and tricks?
have done a spark test and here is what I found. Only cylinder number 1 was sparking so I messed around with the leads and plugs until I checked them all on the good coil and all tested ok then i got spark on 1 and 2. So I thought it was the coils. Pulled coils off and rearranged the order of them to try the dead coils in the good coils position and success those coils sparked so I'm thinking coils leads and plugs are all good...
what's the most likely problem? The stator, trigger or power pack? How do I test the 3 to save me buying parts I dont need.
any tips and tricks?