Home › Forum › Ask A Member › 1973 Evinrude Mate 2HP Issues › Re: 1973 Evinrude Mate 2HP Issues
Again, this is a tough situation…A conventional hone may seem to remove the rust/pitting, but might just be masking the problem…You will really need a super rigid hone, which would be hard to find for such a small cylinder bore…
The 383920s are the correct rings for the engine…But, were the rings you bought OEM pieces, or aftermarket? The ring ends should have notches to fit over the locating pins on the pistons, the ends should not be flat. So, I am guessing you did not get OEM rings…Rings with flat ends would have super oversized ring end gaps that would certainly affect compression…
No, please do not order .030" oversize rings, these will not work unless you have the cylinder bored to .030" oversize and purchase .030" oversize piston…
So, I guess I would probably pull the engine down again and post pictures of the rings you installed. Do you still have any pieces of the original rings left hanging around? If so, look at the ends of the rings to see how they cover the piston locating pins…Flat ended rings will not work correctly…