HX Won't run in the water!

[TimH]

I have a 96 HX, 720,Dual 44's, factory pipe w/ecwi, 125 bs compression in Denver. Starts, runs and revs on the trailer. get it wet it dies. Dealer has leak tested it ect.... Still won't run. Any suggestions?

[Bill O'Neal]

Put a timing light on the motor. It sounds like it is retarded.

[Bryan Glynn]

Posted by Joe St. Louis:

You may have a problem with your CDI unit not advancing your ignition timing. Sea-Doo's have been known to do that from time to time. You may also want to check your rotary valve timing.

[Bill O'Neal]

Tim,
Now that I noticed that you have those mods, let me say that tuning a 720 with larger carbs, that pipe and low compression due to altitude can really be a tough one to tune.
First off, the 720 has the weakest of all ignitions that SD makes. For this reason, we gap the plugs ( BR7ES ) tighter at around .020. Next you need some compression, I'd mill about .030-.040 off of that head and the squish band. Next I'd install a lower pitched prop.

You mentioned the 44's, but without specific jetting and pop off, I cannot make any recommendations about that.

5000 ft of altitude is your biggest problem.

[raider1100]

Why is your compression so low?
Rob

[Bryan Glynn]

Because he's in Denver.