jdub

Hey guys, I recently had the engine rebuilt and it ran great for a tank of gas. After that first tank I noticed I would be riding and the engine would just stop. I would try and start it up again and I could go for like 10 seconds and then cut off. Eventually I couldn't start it after that. I then waited like 30 minutes and tried again and it ran for a few minutes. WTF is going on?! Do you think it could be the clutch settings? I originally had the engine rebuilt because a friend used too much oil for the mix and just becasue it's a 98' and it was about time it was worked on. Any help or advice would be appreciated!

ltlehman

When someone rebuilds a jet ski, they usually add an oil/gas mixture to the tank even if the ski has oil injection. Once this initial tank of gas is used up, then it all up to the oil injection system. Your oil injection system may not be working and the engine could be over heating and shutting itself down. If this is the case, you could be in the process of blowing up your newly rebuilt engine. I have no idea if this is your situation, or even if you have oil injection on your ski; but if you do, you could try mixing oil with your gas.

I might be way off base on this but at least I am giving you some feedback which is more than I have been receiving on this forum.

ltlehman

Also, If you didn't break-in the 2-sroke engine properly, you may have already ruined it. After a rebuild, for the first 10 hours or so, the ski should be driven at alternating speed and definitely not wide open for long periods at a time.

When a 2-stroke is not broken in correctly, the pistons get extremely hot and expands into the cylinder wall freezing up the engine. After the piston cool, the engine can be started again. But, both the pistons and the cylinder walls have been damaged. Because of the scored cylinder walls, compression is also lost.

I would check the compression just to make sure the engine has not been damaged. If it has, another cylinder / piston rebuilt will be necessary.

Good luck!!

p10sdad

Mixing it too rich would just foul plugs. What oil and ratio are you mixing? Clutch setting? Thats a direct drive, no clutch. The other response was right, in addition when you put in new piston and rings you are supposed to oil them and the cylinder walls. I don't know what all you did you, but those are a few things we need to know. Also what did you do for your break in if any?

ltlehman

After rebuilding a 2-stroke jet ski engine, a friend of mine who rebuilds skis also and I always fill the gas tank with a 50:1 mix ratio (2.56 oz oil to 1 gallon) even when the ski has an oil injection system. We do this as a safeguard to make sure the engine is getting enough oil to get a good part of the break-in out of the way. You can fowl your plugs doing this, but we feel that the chance of getting a fowled plug is better than taking a chance of blowing the engine. When the next tank of gas is necessary, you look to see that the injection system has been pumping the oil; if so, fill the tank with gas only.

I personally have never fowled a plug doing this.

p10sdad

Thats a good idea, I have not ever had an injector system on my skis though. I would rather foul a few plugs then have to rebuild it again