Mariner 1986 50 hp

[igorr]

"Runs only on two cylinders at

"Runs only on two cylinders at a time(the 4 plugs are wet), the carbs are ok, has new electrical,new plugs,new gaskets on transfer ports.....any ideas on why only two cylinders pop? Please help before I am also bald as my mechanic who is perplexed and bald."

 

[beckerjs]

"no spark on 2 is trigger or s

"no spark on 2 is trigger or switchbox

I believe the mariner to be the same as merc in that year, look here for testing and dva charts,
http://cdielectronics.com/Downloads/tabid/55/language/en-US/Default.aspx
verify no spark with timing light on each plug wire

if it has spark on all 4 than its got an internal leak, probable lower bearing and seals, check for sucking/poof on all 4 cyl"