Jet ski cutting out after Full Throttle runs? Might be your exhaust coupler - JS Powersports

If your engine all of a sudden sounds louder than normal or you see some smoke rolling out after some high speed runs then your coupler clamp may be loose or may have even popped off. This commonly happens with Yamaha Superjets, Rickters & Krash and any other machine where a b pipe or similar pipe is used and has a rubber coupler between the header pipe in the tail cone. The same symptoms could be from just a loose exhaust hose anywhere in the system or a bad gasket.

[@oceanaddict9251]

Is this advice make or model specific?

[@JSPowersports]

No, happens with b pipe and west coast etc

[@jomi1413]

I’m leaking some water from the end of the couple the two clamps are tight and idea what’s going on