New SBT Brand Crankshaft. 2006 Is a mid year break for the Sea-Doo 4TEC. To determine which crankshaft you have , you must know where your locating pin is. With the timing mark at 9:00, where is your locating pin? 2:00 or 5:00. You can not interchange the 2006 and up with the 2005 and earlier editions. New stretch bolts should be used to prevent both torque loss and possible engine failure when rebuilding an engine. Measuring the old bolts will not indicate how much strength has been lost during the engines heat cycle.