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98 XPL smoking issue
- Thread starter bb16
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Should always do a compression test to make sure you have a good base engine. But it could be as simple as the cable that connects to the carb for the oil. If it is stuck or disconnected it will dump the oil in. At idle it would be and issue. Higher speeds not as bad.
I'm going to pick up a compression tester today. It ran great for about ten minutes until it got hot and started smoking, then it sputtered out like it was out of gas (it's full). I let it cool down and started it again. It ran perfect until it got hot, started smoking and bogged out again. Not sure what it's inductive of, or what it's not getting enough/getting too much of. I'll see if I can check the connection to the carb. Is there an adjustment, or how do I know if it's dumping too much oil?
SabrToothSqrl
Well-Known Member
Your pump looks properly adjusted.
When you say 'ran for 10 minutes'... PLEASE tell me this was in the water, and not on a trailer...?
If it compression tests fine, you're looking for 120-140 in each. The number isn't as important as both being within 5-10 PSI of each other. If one is 120, and the other is 50... you got a problem. If both are 100 or 110, you're fine to move on. It's not 'new engine compression' but it will run.
IN water (with you on it) you're looking to be around 6600-6800 WOT under load.
As for your smoking issue, the 951 requires the correct oil. SEA-DOO XPS II. That will also reduce smoke.
From the shutting off issue, I'd look at the fuel lines (if they are grey, they need replaced) and check the fuel filter above the engine hatch, and then the ones on the carbs.
**if you ran it 10 min out of water.... you're gonna have a bad day...
When you say 'ran for 10 minutes'... PLEASE tell me this was in the water, and not on a trailer...?
If it compression tests fine, you're looking for 120-140 in each. The number isn't as important as both being within 5-10 PSI of each other. If one is 120, and the other is 50... you got a problem. If both are 100 or 110, you're fine to move on. It's not 'new engine compression' but it will run.
IN water (with you on it) you're looking to be around 6600-6800 WOT under load.
As for your smoking issue, the 951 requires the correct oil. SEA-DOO XPS II. That will also reduce smoke.
From the shutting off issue, I'd look at the fuel lines (if they are grey, they need replaced) and check the fuel filter above the engine hatch, and then the ones on the carbs.
**if you ran it 10 min out of water.... you're gonna have a bad day...
Thank you for the help. It was in the water. I had no problem reaching about 6700 rpms. Fuel lines were replaced last season according to the guy I bought it from. Most of the lines look to be in good shape. I think it gets fuel since after it cools back down it fires right up and runs until it's hot and smoking again. I'll try to change the oil, but would that account for the shutting down? Sorry, I'm new to all of this pwc stuff lol
According to the previous owner, over the last two seasons it had new rave valves, fuel lines, starter relay, fuel pickup/baffle, exhaust gasket and manifold gasket. I'm pretty sure if I was to drop it in the water right now it would run perfectly for about 10 minutes.
According to the previous owner, over the last two seasons it had new rave valves, fuel lines, starter relay, fuel pickup/baffle, exhaust gasket and manifold gasket. I'm pretty sure if I was to drop it in the water right now it would run perfectly for about 10 minutes.
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Try another gauge, they are notoriously inaccurate. If it is actually 80-90psi that engine is shot and needs a rebuild. Compression should be done with fully charged battery, plug wires grounded, plugs out and throttle held wide open.
Is it possible you have an exhaust leak and the engine is starving for oxygen. The next time you have it out and starts to feel like it is going to die open the hood and see if there is smoke/exhaust in ghe engine compartment.
Is it possible you have an exhaust leak and the engine is starving for oxygen. The next time you have it out and starts to feel like it is going to die open the hood and see if there is smoke/exhaust in ghe engine compartment.
I tried it again with the same gauge and attempted to ground the plug wires. Not sure how good of a connection I got using the battery charger. It upped it to about 100 and close to 90 in the other one. It did seem like it was running strong when it would run yesterday. Would the lower compression be a reason for it to randomly sputter and stall out when it's hot? Or is that just a side issue lol
Exhaust leak could be possible. There is pretty heavy white smoke coming from the engine compartment when it stalls. Then it takes a couple minutes to burn off. Can I find an exhaust leak by spraying starter fluid and seeing if the rpms jump like on a car?
Exhaust leak could be possible. There is pretty heavy white smoke coming from the engine compartment when it stalls. Then it takes a couple minutes to burn off. Can I find an exhaust leak by spraying starter fluid and seeing if the rpms jump like on a car?
SabrToothSqrl
Well-Known Member
lol, that's the issue. the exhaust leak chokes out your engine. the starter fluid trick would be for your INTAKE. not exhaust.
for exhaust you can (temporarily) plug the exhaust with an old rag or sock and see if you can get exhaust to come out inside the hull to be visible. (run it on land, with appropriate running on land procedure)
holding the oil pump wide open will cause the exhaust to be smokey and more visible.
on the 951 XP, you could have a leak at the exhaust manifold to engine, upper pipe, pipe split, lower pipe to extension tube, tube to water box, or water box to outlet.
just start at the engine and work back.
for exhaust you can (temporarily) plug the exhaust with an old rag or sock and see if you can get exhaust to come out inside the hull to be visible. (run it on land, with appropriate running on land procedure)
holding the oil pump wide open will cause the exhaust to be smokey and more visible.
on the 951 XP, you could have a leak at the exhaust manifold to engine, upper pipe, pipe split, lower pipe to extension tube, tube to water box, or water box to outlet.
just start at the engine and work back.
NEVER EVER! Connect a charger to a Seadoo. You will fry the MPEM and electronics. The only time to use a charge is connected to the battery with the battery disconnected completely from the ski.
When I said to ground the plug wires there are actually tabs provided on the front electrical box to place the plug wires.
SabrToothSqrl
Well-Known Member
Just so you don't think he's being mean, a MPEM will set you back $400-$800 bucks. So, yea. No jumping or charging while it's attached to the ski...
Thanks for the heads up. I'll try to get those done ASAP as well.
benjilafouine
Well-Known Member
Couple things even if I am not really skilled at mechanics.
At compression 80, I don't think it would even run at full speed in water. Mine just kept bogging down as soon as I tried to accelerate (yes, my engine died). And when it bogs down, are your plugs completely dirty of super clean? You have to be sure about that.
Secondly, and because of my engine dying last year, I tried to charge the battery and I too was told not to charge it when the battery is connected. Turned out that someone on this forum told me that chargers are OK as long as amperage is very low, like 1 AMP (never 3 or even worse 6). But nevertheless, I never fried my MPEM at 2 AMPS and less but since that advice, I try to avoid it. Of course, it is always safer to unscrew the red cable.
Finally, and I know nothing about your ski but I suspect that my engine died because water went inside it because my muffler was taking water: there was a hole in it (rust) where the cooling water is injected into it so if there is a hole in your muffler, have it fixed (welded) ASAP.
Hope I am not writing stupid stuff here.
I am sure if I did someone will tell me.
At compression 80, I don't think it would even run at full speed in water. Mine just kept bogging down as soon as I tried to accelerate (yes, my engine died). And when it bogs down, are your plugs completely dirty of super clean? You have to be sure about that.
Secondly, and because of my engine dying last year, I tried to charge the battery and I too was told not to charge it when the battery is connected. Turned out that someone on this forum told me that chargers are OK as long as amperage is very low, like 1 AMP (never 3 or even worse 6). But nevertheless, I never fried my MPEM at 2 AMPS and less but since that advice, I try to avoid it. Of course, it is always safer to unscrew the red cable.
Finally, and I know nothing about your ski but I suspect that my engine died because water went inside it because my muffler was taking water: there was a hole in it (rust) where the cooling water is injected into it so if there is a hole in your muffler, have it fixed (welded) ASAP.
Hope I am not writing stupid stuff here.
I am sure if I did someone will tell me.
Check the compression with a different gauge. If it is at 110, you will need to do a top end. Don't use starting fluid on any 2-stroke as there is no lubricant in it. The engine likes lubricant,,,
Hopefully I'll get around to checking into it this week. Where do you think is the best place to plug it up to try and find the leak?
***Side note - I just stuck my hand under the motor and there is a little water in there that is definitely has oil in it. I think it's old, I don't see anywhere where it would have leaked from and all the gaskets appear good. Maybe this is causing the smoke and choking out the motor when it gets hot? Any opinions on this?
SeadooMaster
New Member
Make sure the Waterbox is connected correctly sounds like the seal is cracked connecting the exhaust from the motor to the Waterbox which is essentially saying that your engine can't get rid of the fumes and choking your engine. Check to make sure that everything is snug with the exhaust, maybe start it with the seat off and run it and see where the smokes coming from and go from there. Have fun on your new toy, and I hope this helps.
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