1998 pegaso 650 idle problem

[krazynuts]

hi, i have a 98 pegaso 650. my problem with it is that the motor shuts off if the idle falls below 2000 rpm. at high idle it works good, no hesitation no problems. all the vacuum hoses are new and seal properly. i have taken it to the mechanic and he cant find anything wrong with it. grant it he isnt an aprilia guru but there is no-one else i trust. any help would be appreciated. thank you.