Ruined my 50 HP 2 stroke?

[shuyge]

Guys,

I made a massive mistake. My oil container had water in it and when I emptied the last of it into the oil reservoir on my 2001 Mercury 50 HP, I over heated it.

I had it in the shop and the mechanic ran a leak down test on it. Two of the three cylinders tested at 3-4%. The top cylinder tested at 14%.

I don't know what brand or orifice size was used for the test.

I was told that anything over 10% was considered "bad".


Anybody want to chime in on just "how bad" this is? Would you consider draining the water out of the reservoir, oil pump, and fuel from the carbs and running this motor?

How much of a risk would that be?

TIA,
Stan

 

[shuyge]

Re: Ruined my 50 HP 2 stroke?

Ok guys. I did this. I figured that I didn't have that much to lose so I went for it.

It runs. It's a bit loud. Sounds a lot like a 1968 Suzuki motorcycle.

I ran a compression test on it. All of the cylinders ran about 85-90 psi.

Anybody know how much they should have?

 

[trendsetter240]

Re: Ruined my 50 HP 2 stroke?

Clear out the oil tank, purge the oil lines and re-fill with fresh oil before running it. Might be a good idea to mix your gas 50:1 until you can be certain the oil tank and lines are clear and pumping clean oil.

85-90psi is a little low but if all the cylinders are within about 10psi of each other it should be ok. When one cylinder drops down to 50 or 60 psi then you know you are in for a rebuild.

 

[Faztbullet]

Re: Ruined my 50 HP 2 stroke?

Its hurt.... That motor should have about 110 psi per cylinder and 14% shows scuffing/piston ring stuck. Stop using it before you have major damage as these models will pull the sleeve rearward and piston rings will drop behind sleeve, this takes out piston and sometimes rod when this happens.

 

[shuyge]

Re: Ruined my 50 HP 2 stroke?

Fazt and the rest, I appreciate your replies.

Would it help to know that I live at 6300 ft above sea level?

I'm assuming that I should get lower readings here.

Unfortunately, I don't know what the compression was before the incident.