Carb runs well with air screw almost all the way seated

[bigwillee]

I just bought a 2007 Kymco people 50 2T with about 11,500 miles. I was told that it had a engine rebuild at 5000 miles (not km). I'm not sure if it was a big bore kit or still 49cc, but the scooter gets up to about 45 on flat ground and 50 downhill. The variator is derestricted, but the exhaust is still restricted. So my question is when tuning the carb, it really only works well when the air screw is turned in all the way then backed out about 1/4 - 1/2, any ideas on why? Air leak? Big bore kit with different jets (haven't checked yet)? Or is this within spec? Any help would be greatly appreciated.

[BettinANDlosing]

Hey there welcome to the forum, the people 50 carb has a fuel screw, meaning that the tighter it is the less fuel it's getting. They ideally run at about 3/4 out. The dash is also in km not miles. Not sure why it would need to be turned in all the way I would start by taking the carb apart and cleaning and inspecting everything.

[chaz35]

I don't know why, but I normally have to turn air screw out only 1/4 to 1/2 turn to get it to run right.  Sometimes, it likes turned in all the way.  I have 2 Super 9's and 1 People 50 2T and they all like the air screw turned in more than recommended.  If it's running well, I wouldn't worry about it very much.  Check your plug to be sure not running too lean.  Actually, the less you turn it out, the richer the mixture, as I understand it, so you are probably safe.  Cheers

[bigwillee]

Thanks. That puts my mind at ease! I did a couple plug chops and it looked okay, just didn't know if something was clogging my intake or something. But if that is what works for others, I'll just stick with it. Thanks again!