Yeah, with four stroke engines, you do not want to run it lean, so work it out to blubbery rich, then tune it as suggested above. Heck, you don't want to run any engine lean, so recommendations for rich settings follow for just about all engines. I run my OS's pretty rich, but not to rich where it just spits fuel and oil out the exhaust, although it does that anyway. If you don't see a smoke trail behind your aircraft, you might be a tad to lean, but that's not a rule, just an observation.

CGr