Low Compression Help

[Slowrider]

I've got a 1993 Seadoo spx with the white motor. It runs great will do about 45-47mph. Pops out of the hole like a champ. Compression readings (cold with WTO) are 130psi in each cylinder. Ski set for about 12 years, I've run seafoam in it a few times, but compression stays at 130. Plugs are gapped at .024 and running 92 octane gas in it. This ski i got for my daughter and plan on keeping it. My question is: should i do an upper overhaul, or let it slide for a few a bit longer? I don't want to fry the engine. My compression tester is new and it seems to be of good quality. It is not premix and the injector is working fine, plugs look good and are a consistant brownish color, and ive been using Amsoil in it as i do all my engines.

 

[burtshaver2021]

I will run mine at 130, For me 120 is the benchmark to rebuild. I find once they get to 120 they become harder to start. You should be able to get another 40 hours of riding till you get to the 120 ish area.

 

[Slowrider]

Awesome, Thank you

 

[etemplet]

I've found significant damage to cylinder bores and pistons at 130psi (Missing pieces of the upper ring, cylinder scouring). I'd pull the head and have a look at the pistons and cylinder bore. Easy enough to remove the cylinders, hone and install new pistons. You'll guarantee yourself years of no issues. They key to reliability with a two-stroke is prevention. If you wait for it to break... break it will. That metal that is wearing is getting into the crank bearings. Doesn't hurt to take a look it's only 12 bolts. Or... ride it like to stole it. Good Luck !!

Side note: check your spark plugs and make sure it is not running lean.

 

[mikidymac]

Stop using seafoam, it’s doing absolutely nothing. Also your ski only needs 87 octane, you are just wasting money on 91.

Use good oil which you are, non-ethanol fuel if available and fuel stabilizer for storage.

It’s running great so keep running it and fog after use.