Haven't been stuck in Dub before but in general the locals are a pretty friendly bunch so connecting with a local bike club is a good way to go. You'll likely get some free suggestions, maybe some trouble shooting from a knowledgeable local and at minimum a referral to a local mechanic that they frequent. A search reveals one of the clubs hangs out here, probably a good place to start. Best of luck, hope it all works out for you.
Biker's Caffe details
Address Kralja Petra Krešimira IV 37Area Ploče
Transport Bus 5 & 8
Telephone 91 764 6919 mobile, 98 680 711 mobile