Winco PSS75LS FUEL CONVERSION INSTRUCTIONS - Manual (Page 3)

is marked with an “L” & “R” meaning lean and rich and it only turns about
60 degrees.
2. Start the engine and very gently make adjustment to the air to fuel mixture
to smooth the engine out. NOTE: In some cases you may have to adjust
it rich or lean just to get the engine to start.
3. Once you have the engine running smooth, stop and then restart it and
recheck your fuel adjustment.
4. Repeat this process until the engine starts smoothly, comes to speed
properly, and runs smoothly.
5. The starting should be rechecked at a later date when the engine is cool
to make sure it still works properly.