"Newly rebuilt"- - - - -how many road miles does the fresh rebuild have on it, and what kind of honing and cylinder preparation was done during the overhaul? Was the engine rebored and new pistons fitted, or did it just get a re-ring job? It's vitally important to run the engine under load, like several long uphill pulls, to seat the rings to the cylinder walls. A no-load run to break in the camshaft does not load the rings sufficiently to seat them. For many years, the seating procedure recommended by Perfect Circle was 10 full throttle uphill pulls from 30 MPH to 50 MPH in top gear. Other ring manufacturers required a similar break-in procedure.
Jerry
