After doing the required runs and another oil purge the tappet would still not seat. Sling authorized the warrantee. Before the mechanics came, I had a grounding issue that prevented Lane A or B and fuel pump starting. The guys from Midwest came by after one of their installs and located the offending wires. All is electrically good. That solved, the tappet was replaced. No damage to the engine running the bad tappet was discovered The Rotax installed tappet did not have the spring installed during manufacturing. I am surprised that issue was not discovered during the Rotax engine test stand run