First thing I would do is check all the fittings and clamps like johngtx suggested. If you dont find any loose then do a pressure test on the entire fuel system. I believe the manual gives instructions on this. You can use a pop off guage to do it as you dont need a huge amount of pressure. If you don't own one already go ahead and buy one cause you can't get your carbs right without one. Based on what you have said I still believe its a fuel delivery problem not RAVE associated. That being said, pulling and cleaning the RAVES is something that should be done occasionally anyway so it's not gonna hurt anything. Sorry to hear you are still having issues with it. Don't give up and keep us posted. You will get it fixed. You haven't lost the war unless you surrender and give up. :thumbsup: Unless the internals in the engine or the airbox have been changed there is no reason to go changing jets. Stock jets will run just fine if everything else is functioning properly. Take the ski home and start tinkering with it yourself. I will give your mechanic the benefit of the doubt and say he isnt trying to screw you but just really doesnt know what to do so therefore he is guessing. Eitherway you are waisting time and money doing this. Money you could be spending to actually fix your ski.