New first time sea Doo owner here. Ran the 99 gti lean on my third trip out. Seized engine. Tore down carb. No smoking gun their except plugged inlet on the accelerator pump. Tore out tempo lines, cleaned petcock, cleaned gas tank, found a few pieces of black gasket like material in the tank but filter was clean. Filter in carb was clean also. While I wait for my top end kit, wanted to check all the coolant lines. Any helpful hints or best practices for getting this done. Engine bay is open with carb, top end, and tuned pipe removed. Just looking for the best way as I haven't quite deciphered how all the coolant lines interact yet.