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I took a 1100 ZXI for a water test today, (first one of the season) I live in Mass. and the water is cold still.....Im looking for some opinions.
I let the ski warm up for a few minutes, then got right on the throttle. After riding for about 10 minutes, the ski shut off suddenly, at about 3/4 to full throttle. Now the water temp was about 45 deg. And the tank is premixed. This ski also has an SBT motor in it that was installed in Nov. of 05. (it only really has about 20hrs on it)
After it shut off I started it right back up again, and it ran fine, for a few minutes, and I decided to make another WOT pass. It shut down again....
It started back up fine and after about a minute or so it began running only on 2 cylinders. I got it back in the shop, and found only 80lbs of compression in the Center cylider.... My question is would the center cylinder cold seize before the PTO cylinder??? There was a small area that was burned away on the piston on the exhaust side. I pulled the engine all down, and also opened up the carbs, but they were very clean. Im just not sure what else would cause the center cylinder to burn down like that. The ski was in for a charging issue, ended up replacing the reg rectifer, and customer requested a water test. Putting a new piston in is no big deal, I just don't want it happening again. Perhaps I should of been on and off the throttle a little more, and I did noticed after putting it back on the trailer, and feeling the engine, it wasn't very warm at all. Any opinions guys? Maybe a dope slap?....... Thanks!
I let the ski warm up for a few minutes, then got right on the throttle. After riding for about 10 minutes, the ski shut off suddenly, at about 3/4 to full throttle. Now the water temp was about 45 deg. And the tank is premixed. This ski also has an SBT motor in it that was installed in Nov. of 05. (it only really has about 20hrs on it)
After it shut off I started it right back up again, and it ran fine, for a few minutes, and I decided to make another WOT pass. It shut down again....
It started back up fine and after about a minute or so it began running only on 2 cylinders. I got it back in the shop, and found only 80lbs of compression in the Center cylider.... My question is would the center cylinder cold seize before the PTO cylinder??? There was a small area that was burned away on the piston on the exhaust side. I pulled the engine all down, and also opened up the carbs, but they were very clean. Im just not sure what else would cause the center cylinder to burn down like that. The ski was in for a charging issue, ended up replacing the reg rectifer, and customer requested a water test. Putting a new piston in is no big deal, I just don't want it happening again. Perhaps I should of been on and off the throttle a little more, and I did noticed after putting it back on the trailer, and feeling the engine, it wasn't very warm at all. Any opinions guys? Maybe a dope slap?....... Thanks!
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