97 seadoo xp cylinder down

[seadooxp718]

One cylinder is perfect the other has no compression. What else could it be besides a bad cylinder pistion or pistion rings? its the 787 motor

 

[Bills86e]

Top end job!!!!!!!!!! ect ect. Find the cause, or it will re-occur.

 

[L_C99]

Besides what you listed the only other cause for no compression could be the headgasket/o-ring. Take the heads off, and you will probably spot your problem.

 

[dsw222]

Find the cause, or it will re-occur.

Where would you start looking?

I just did a top end job.... Carbs are clean.... I was thinking to check oil pump operation by manually pulling them wide open at idle

What else?