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Today I started the 180 it ran fine for a minute then started knocking so I cut it off so it needs rebuilding already it had 75 psi compression I have never rebuilt an engine before what would this evolve please reply so I can get what I need do do this

I took the plug out and spun it it did not make a knocking sound it may be just running rough what do you guys think

Check the oil level, is it overfilled or low for some reason?

The oil is new and I right at the full mark when I put the plug back in it made the knocking sound