2004 Merc 2 stroke 90HP seized after rebuild

[steven.swiatek]

 

[QBhoy]

50:1

That’s not enough oil for a break in. I’d also say never to hold the rpms the same for any length of time during a break in. Especially at that rpm so early in the break in. You’ll want to vary the rpm all the time during break in.

 

[steven.swiatek]

 

[steven.swiatek]

What do you guys make out of this scaling in the exhaust ports?