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  1. S

    90HP 2 Stroke Exhaust Port scaling

    I premixed it for this. I have heard I should have done double oil, but the guy who did my machine work (in his 80s been doing this for a long time) said not to use double oil. I am going to clean the carbs. I also had ordered a new water pump kit because mine was getting warm at low rpms so...
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    90HP 2 Stroke Exhaust Port scaling

    Yes sir thats what I mean. I used a ton of it to get the needle bearings to stick.
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    90HP 2 Stroke Exhaust Port scaling

    I will say though, I used a ton of grease when I was putting the motor back together. Do you think soo much grease could have been the culprit?
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    90HP 2 Stroke Exhaust Port scaling

    I was using lucas semi-senthetic 2 stroke oil. No I had the boring and honing done at a machine shop, but now since I have to do it over again I am going to do the honing myself, but not with a ball hone.
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    90HP 2 Stroke Exhaust Port scaling

    Rebuilding my 2 stroke again after I just rebuilt it. Looks like it wasnt cleaned properly, but can't say for sure if that is what this is. Anyone have any idea what this scaling is?
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    2004 Merc 2 stroke 90HP seized after rebuild

    What do you guys make out of this scaling in the exhaust ports?
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    2004 Merc 2 stroke 90HP seized after rebuild

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    2004 Merc 2 stroke 90HP seized after rebuild

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    2004 Merc 2 stroke 90HP seized after rebuild

    I did clean it with a pressure washer and some dawn, but I would not say impossible that there was something stuck up in there. And just for more situational awareness, I ran it according to the break in instructions for about two hours before this finally happened. It wasn't until the end of...
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    2004 Merc 2 stroke 90HP seized after rebuild

    You mean where the spark plugs are? It looks fine. No damage or anything. Would the debris come in from the exhaust side? Or just the intake?
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    2004 Merc 2 stroke 90HP seized after rebuild

    I did not check the clearance. The guy bored it to 0.31 over, which is what the merc manual says. I did not check the piston to bore clearance, but I know he did after honing. Do you think this looks like it wasn't bored to the right clearance?
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    2004 Merc 2 stroke 90HP seized after rebuild

    I had it machined at a reputable shop, but I reassembled it. I am in NE Florida. The pistons and cylinders felt like there was still some lubrication.
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    2004 Merc 2 stroke 90HP seized after rebuild

    Here are some pics
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    2004 Merc 2 stroke 90HP seized after rebuild

    50:1
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    2004 Merc 2 stroke 90HP seized after rebuild

    Would it be a safe bet to just restore the oil injection system?
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    2004 Merc 2 stroke 90HP seized after rebuild

    I already ordered a new water pump kit.. But my temp gauge was reading normal temps. Could that still be the issue? And what with the carb could cause such a quick catastrophic issue? I am asking because I honestly dont even know where to start.
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    2004 Merc 2 stroke 90HP seized after rebuild

    Hey yall. So my 2004 mercury ran perfect until one day sucked all of the oil down in a short trip and seized up on the way home (oil alarm didn't work). Cylinders 1 and 3 were scored so I opted to have bored .30 over and rebuild. I also opted to bypass the oil injection (capped off the pump...
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