hal5778
Member
Hello All I have a 1996 Seadoo Sportster with a 717 rotax I dont have alot of history on this boat but this is what I have done and the problems I have. When I originally tried to turn the motor over it would not so I pulled the plugs and it turned over but blew out of the spark plug holes a light blue milky liquid (I assume this was a water/oil mixture). I then decided to pull the top head assembly off and noticed that there was this same liquid in both cylinders. I cleaned as much as possible changed out all Orings and reinstalled the heads using torque specs and sequence. With the plugs out the motor turns over fine and no longer is blowing any liquid out of the plug holes. When I put the plugs back in I attempted to turn the motor over and it turned briefly then stopped so I removed the plugs and once again turned the motor over with no problem and no liquid exiting. I decided to do a compression test and what I found was the front cylinder was fine with 140lbs but the back cylinder was at an extreme amount of 270lbs. I have no idea what could cause this high compression but assume this might be why it wont turn over with the plugs in. Any help in determining the problem and a method of correction will be greatly appreciated