This isn't really a moped question but it deals more with 2 strokes in general.
This spring while I was at school my dad brought our lawnmower to the shop and they did a bad job tuning it up. It worked fine before so I'm not even really sure why he brought it in originally... but now it is very difficult to start. It will start but only after like 10 pulls... how can this be fixed? Is it the idle mix screw?