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Dane1990

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Hello everyone,

I just joined this site because I bought my first seadoo last year and I have turned it into a long-term project to fix up, and I thought I could turn to others for help by joining this forum. My seadoo is a beautifully conditioned (the body) that has always been stored inside, decently maintained internal parts, and averaged speed. 90Km/h or 55.92mph (GPS tested). It currently holds 175psi in the rear cylinder and sadly, 160psi in the front. Its too bad they aren't equal at 175.

I have never had any experience with Seadoos, as I have only ever rode one a few times before my purchase. I did some research and by videos, forums and some sites, I kind of figured out how to fix up a few things.

So far to date in the season that I have had it, I ended up installing a splash guard, a decal wrap, wear ring, impeller (Solas X-prop 16/23), iridium spark plugs, new positive connector, hydroturf, new steering cable, new deka battery Deka ETX16L @ 325cca, and replaced the back nozzle.

I am looking to make this Seadoo a long-term project and replace more and more and I continue to own it. My dads friend is an amazing Seadoo mechanic who I might get to rebuild the engine and replace the crankshaft etc., sometime in the next couple years.

Well, Hopefully I can get some good advice on here that will help me continue to fix my machine up!
 
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Welcome to the forum Dane.
You have a great advantage over most of us as you have someone to teach you all the ins & outs.
 
you have an aftermarket head ? have you pulled the head to check it ? that compression is high, and unbalanced.

My engine head is stock. I thought 175psi in a cylinder is what the SeaDoos are manufactured at when they are new. My dads buddy is a mechanic and when he tested the one cylinder and it hit 175 he said thats perfect. He tested the other it only hit 160, possibly a few digits higher and he said that the cylinder may have been damaged somewhere along the road. I'm just going by what he told me.
 
the 170 range is fairly normal for the 787, the 951 is less. With a compression that high you should check your squish just to make sure it is within range. It should be 1.26 to 1.6.
My gauge is not a high end gauge so I am not sure how accurate it is. Also if you have winterized it and have some extra fogging oil in the cylinders that will give a higher reading as well.
Be sure to use a good grade fuel.

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Anything over 160psi you should be running premium gas. There's also more than 15% difference is worrisome also.

Lou
 
Anything over 160psi you should be running premium gas. There's also more than 15% difference is worrisome also.

Lou

Not to get all technical but it is 15lbs, which is still less then 10% difference, either way it is definitely something that you will want to monitor on a regular basis.
 
the 170 range is fairly normal for the 787, the 951 is less. With a compression that high you should check your squish just to make sure it is within range. It should be 1.26 to 1.6.
My gauge is not a high end gauge so I am not sure how accurate it is. Also if you have winterized it and have some extra fogging oil in the cylinders that will give a higher reading as well.
Be sure to use a good grade fuel.

I ALWAYS run 91 Octane fuel from Shell in Canada. It is great gas (the only gas I know of that has no ethanol in it). And I always use Full Synthetic XPS 2-stroke oil.
 
160 is typically achieved with the proper squish on a stock head. 91 gas is just fine. typically when you get a head cut it bumps it to 180 which is about the limit on 91 non eth gas.

Welcome to the site! You found the home of the X-4 junkies...get ready for another addiction!

If there is anything I can help with just let me know.
 
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