I set the Max RPM to 3450, adjusted the valve lash, and gave it a test run in the sloppy melting snow that we have left from Saturday's storm.
All seems to be good.
I have a hunch that Tecumseh rates their lower HP engines, when they share the same engine block as a higher HP model, by setting the Max RPM's lower. The 8 and 9 HP both are the 318cc engine.
The 9 HP is spec'd at 3600 RPM, the 8 HP spec's don't seem to be published. . . .
8 HP ÷ 9 HP X 3600 RPM = 3200 RPM (which was the original setting before I made any adjustments)
Current & Past Fleet:
2017 Husqvarna ST224 (SOLD)
2014 Troy-Bilt 2410 w/ Briggs & Stratton 305cc Engine
2003 Ariens ST824LE (SOLD)
1999 Toro PowerShift 824 w/ 318cc OHV Tecumseh Engine
1988 Toro 521 w/ 212cc Predator Engine
1985 Toro 3521 w/ 179cc Powermore Engine (SOLD)