how long have you had it? more than a couple of months and you don't really have any come back on the shop. sounds like they can't @rsed to sort it for some reason! if you bought it recently from them, you really need to push them to sort it quickly or you'll loose your oppertunity. don't be too sypathetic toward them, they may well of knowingly sold you and old dog of a bike!!! there are loads of things you could check on the bike but it depends how much you can do yourself.... plugs, ignition lead condition, fuel/ air filters, oil levels, battery charging, good earth connection......... have you tried calling a dealer to get an idea of prices? it may not be as bad you think and they will certainly be able to sort it out.