The fuel-air muxture control is through a hole in the
air-filter box, it needs a 5mm hex key I think. BUT this is a job that needs the be done with an exhuast gas
analyiser. I think to lean the mix turn anti-clockwise.
(do a search on this forum "adjusting mixture" or similair)
http://www.peachparts.com/shopforum/search.php?action=showresults&searchid=744858&sortby=lastpost&sortorder=descending&pagenumber=1
The tick over is adjusted by turning the screw control
which is underneath the air-filter box on the passenger side. Its a big screw so easy enough to see. BUT there is little point messing with the idle until the mixture is sorted out (unless its really bad!)
Mike.