Our new (OH) IO 540 for the RV-10 came with retard (no impulse), and no Slickstart -- took me over a year to figure out why our starts were difficult, and even impossible, when hot. Installed Slickstart and problem went away.
RV-10 Co-built, maintained, flown (sold)
RV-8A Maintained and flown (Sold)
RV-6A Bought and Flying (N177RV), upgrades $$$
IO360, 180HP/CS, AFS 5600T, D10A, G650, G430, G327, ADS-B, VIZ385 AP
Very Happy Contributor
Comm, SMEL, CFII, A&P
Based at KCLW (Clearwater, FL)