Post #20
http://www.x-h2o.com/threads/103772-My-1st-Superjet
You do not have to remove the tank or battery box to get the motor out with the stock exhaust. Disconnect the ebox from the hull, battery and start/stop switch. Disconnect the throttle cable and fuel lines from the carb. Remove the coupler cover, and disconnect the grease and water lines. Loosen the 4 motor mounts, and remove the shims under the engine cradle (keep them in order) before you remove the bolts completely. Pull the motor, exhaust and carbs as one piece. Do the rest of the work on the bench.
Remove the fuel tank and battery box. You will need the tank out to get the b-pipe chamber in, and the tank goes in a lot easier if you remove the battery box. I would pull the motor before the fuel tank, because the tank is hard to get out with the stock exhaust on.
The B-pipe manifold is a pain in the ass to put on. Get a stamped metal 12mm wrench (the kind that come in atv and jet ski tool kits) and grind it down so it fits where you need it to. The two hex head bolts for the b-pipe manifold come to long, so you will likely have to grind them down. Put a tap or bolt on them 1st, then remove the tap/bolt after they have been cut or ground. I did not do this, and while one of these bolts came out perfect, the other damaged my cylinder.
Good luck.
Oh, one last important thing... you need to grind down the center rib or it rubs against your pipe. If you have destroyers, you need to cut about 1/4" off the rear bolt or it will rub your pipe. Do NOT grind the rib with your motor in.