Hi N1KKO
Some of the more modern hondas have a little nub on the pilot metal screw which prevents more than 1/4 turn either way.
If the screw is free to turn fully, I would screw it in (counting how many turns from original position), then 2 1/8 out as a starting point.
If you screwed the plastic throttle stop screw in completely, it would (as you found) idle around 3300 rpm. Just back this out to 2000rpm, have a slight play with the idle mixture pilot screw, then set it back to 1750rpm.
Regarding the masport 800sp, please do post another thread. They are a good mower with a multispeed drive system. The transmission is made by general transmissions and has a variator pulley not multiple gears, commonly wanting to slip from speed 8 to speed 1 on its own (which is a crawl) is the main thing i have found with them.
Last edited by Tyler; 13/03/23 12:11 PM.
