Hi guys it's been a long time since I've been to a bash I've got some cars ready to go so hopefully I'll be there , which part of temple newsam do you go to ?
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Im looking for the same and found this http://www.ebay.co.uk/itm/NEW-HPI-Racing-Belt-S3M-180-60T-5-5mm-A732-NIB-/290625085553?pt=Radio_Control_Parts_Accessories&hash=item43aa9ae071#ht_831wt_1130 looks about right.
Still sounds like you have a air leak somewhere as when you reduce the amount of air going through the carb it will run in a fashion. get it running again then spray wd40 around your gaskets if the engine revs without any throttle input then that will be where your leak is.