I have a 1997 Seadoo GTI 717 motor single carb. just got motor back from being rebuilt and i put a new carb kit in it all new fuel lines in it. i ran it about 11 hours and now its starting to bog seems to help take off if i work the throttle. i run the XPS synth oil in it i put new plugs in it and everything. any thoughts on what may be causing this??