1995 90 HP Mercury Mariner Question

[Timberman72]

Question anyone.

Motor runs good, and misses, had compression check done, was outstanding. Motor died, and started back again, one or two times, by changing the spark plugs. Then, motor started missing terrible. Barely made it back to the boat ramp. At this point, changing the spark plugs again didnt help at all...checked firing, and two cylinders were not firing. Got mad, and left it alone for a couple of days. Went back to it, and it started. All cylinders were firing. Took it to the lake, it ran fine. Turned the motor off to fish, went to start it up, it started, then died. Cranked it for a while, and it started. Went to the boat ramp, turned it off, got the trailer, it would'nt start AGAIN. Let it sit for awhile, 2 or 3 days, had firing checked, compression checked. Motor started running the day before I took it to the boat shop. Has ran fine ever since....until last night. Motor shook very bad, flooded and missed. Any ideas???

PS...Carbs have been cleaned, and gas mix ratio is correct.

 

[jerryjerry05]

Re: 1995 90 HP Mercury Mariner Question

Sounds like water in the gas.You have a built in tank or running on portables?.J

 

[Timberman72]

Re: 1995 90 HP Mercury Mariner Question

Built in tanks...tank has been drained and cleaned, no water at all. Carbs were rebuilt as well...only odd thing I have found, was heavy condensation on all three carbs when motor was ran at high speed...boat mechanic said wasn't a big deal. However, I have never seen that before.