Starting/running problems with gilera runner

my mates gilera runner has recently been having problems starting and running. its app to do with the fuel injectors. he had it booked in at the garage but they seemed to rip him off 80 quid for nothing. i had a go on it earlier and it seemed ok but when i stopped the revs stayed high and took a while to go back to idle. any one know what it could be or how to resolve it?

 

yeah , my mate has the problem with the revs sticking high and take ages to get to idle what is caused by ? :wtf:

 

idle mix most probs on a carb model.

but the first one if someone told him fuel injectors he will have the injection and if so best taking it to a garage or a dealer

 

he did take it to the garage and supposedly they sorted it!!! its 55 plate btw.

 

well take it back and tell them its the same !

and tell them to actually fix it.

and am guessing warrently has run out ?