1989 seadoo has very low compression but runs great?????

[brock1]

My 1989 seadoo has been running great for a long time now and the other day i was out on the lake and it just died on me. So i pulled it up to shore and when i tried to start it it would just click at the solenoid. So i got it out of the water and took it home. At home i started to diagnose and found the engine to be siezed. So i broke it free relatively easily and put the plugs back in hit the start button and boom fires right up. So i was afraid that the oil injection quit on me so i just premixed the gas instead. started her up and shes runnijng great. Pulled the plugs and did a compression test to be safe. FOUND THAT THERE IS ONLYY 100 IN BOTH CYLINDERS AND ITS RUNNING LIKE A TOP.I CANT FIGURE THIS OUT FOR THE LIFE OF ME AT THAT READING ITS STILL RUNNING LIKE IT IS. I DO PLAN TO REBUILD SOON THOUGH BUT ANY SUGGESTIONS

 

[Dr Honda]

Is it running well on the trailer, or is it back in the water?? I'm betting it wont run so well once there is a load on the engine. Also... the very low compression is probably why you stuck a piston. The hot gasses getting past the piston rings overheated the skirts, and caused a soft/light seize.

Either that... or your gauge is wrong.

 

[brock1]

nope it runs even better on the water had it out last night