I would like to know on stock cdkII keihen carbs what the general fuel pump pressure range is in operation. I have lost two engines to what may be inadequate high speed fuel delivery. I am going to rebuild carbs and pump, but would like to "T" a fuel pump pressure gauge in the rubber fuel line attaching the pto carb (which has an integral pump) to the mag carb (the cylinder that is seizine) to monitor fuel pump pressure while running, unless that is a bad idea for some reason. And yes, tank was clean, fuel was flowing, cooling system was good, seems to be something with fuel delivery. I will be checking pop off pressure this time, but did not the first time since the ski ran great-right up to the point it blew. fuel is flowing freely to the carbs, but I have yet to find the answer and dont want to to blow another engine-thanks in advance.