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milky plugs

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Rod MacQueen

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1989 Mariner 2 stroke 40 hp(yamaha built)first run of the year--it was stored outside through a Canadian winter --it ran like crap --bogging--stalling at idle--made trolling impossible--made it home--took the plugs out and there is a milky grey liquid on the plugs--i figure maybe bad tank of fuel so i replace the fuel and install new plugs--next trip out the thing runs perfectly all day--as smooth at idle as is expected with this motor--starts right up --top speed seems to be there no problem--compression shows 120 psi both cylinders---i take the plugs out out of curiosity and the grey milky crap is there
before i take this old girl to the questionable local shop does anyone have any suggestions
 
Do a better compression test.Remove both plugs.Check comp.Then spray some WD or oil in the cylinders.test again.Post the results.
I had a motor with 145# comp on all three and it still had a blown head gasket.
It's possible the motor had water in it and froze the water jacket and water is getting back through the exhaust.J
 
hey Dockside--If I have this thing on cuffs idling and it is peeing it should be at operating temp, right?--so i shouldn't be able to put my hand on the heads--right?
I'll try it tomm. in the driveway
JJ05--I'll try another compression test as you suggested and see what takes place
as far as ethanol goes they just started adding it to the fuel in these parts about a month ago and I am running hi test fuel which they say has no ethanol
 
Rod MacQueen said:
hey Dockside--If I have this thing on cuffs idling and it is peeing it should be at operating temp, right?--so i shouldn't be able to put my hand on the heads--right?
I'll try it tomm. in the driveway
JJ05--I'll try another compression test as you suggested and see what takes place
as far as ethanol goes they just started adding it to the fuel in these parts about a month ago and I am running hi test fuel which they say has no ethanol
Click to expand...

You should be able to put your hands on the heads without it being uncomfortable for at least 7-10 seconds.
 
I decided to push ahead with exaust cover gaskets--got er all disassembled and lucked out getting all the bolts out without breaking any--- waiting for the gaskets from the dealer--will post if this cures the dreaded milky plugs
 
well back to the saga--reinstalled the exaust cover----everything went fine--fired er up on the cuffs--seems ok--i decide to let er come up to operating temp----no go idled on cuffs for 20 minutes--head still as cold as a witches tit--so i decide to check the thermostat--THERE IS NO DAMN THERMOSTAT--WHAT THE HELL?--could this be some kind of a hillbilly /gerry rig fix from the previous owner?--i mean it runs nice and cool--too damn cool--the spring on the water pressure release valve is missing too
 
yup--I believe you nailed the problem right off the the bat--I appreciate the help by the way--going to order the parts--is a thermostat around 50 bucks?--thats the price i'm seeing online--again thanks for the help
 
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