Large amt. of smoke on initial startup

[94seadoox_p]

As of this summer, this is the first time i've had smoking issues on my 94 XP. I get a large amount on initial startup (in or out of water) that is there while idling for 2+ minutes and will immediately go away while planing out. On plane-out, there is some slight hesitation that immediately goes away along with the smoke. My thought is that I'm burning a large amount of oil built up in the block that leaks in slowly over time.

The ski sits for weeks on end and gets used a few weekends a summer. This only happens on the first startup of the weekend and is fine for the remainder of its continual usage.

I'm the original owner and this spring was the first time anything other than plugs and batteries have been put in it. o) I rebuilt both carbs/fuel pump w/ OE Mikuni along with all fuel line and fuel filter. I also Changed pump oil/wear ring and added an off brand R&D-like rideplate extension w/ a Skat-trak impeller (omg awesome)...

I took the rotary cover/oil pump/carb assembly out as one unit to work on it. I replaced the oil injection lines also.

Given my problem, my best guess is that there's a seal of some sort in the injection pump that is allowing oil to seep by and into the engine. After idling and going around the lake for a rip, there is a noticeable "oil slick" in the water at my cabin where the ski was idling. I've read there is an adjustment on the pump lever itself although i'm not exactly sure what for. Obviously that wasn't manipulated when I took the rotary cover assembly out of the ski...

Does anyone have any suggestions? I've put probably 6+ tanks of gas through it this summer and the oil tank has depleted quicker than it ever has, although not alarmingly quick. Again, it runs exceptionally well otherwise but if i took this to a public boat launch, i would be mortified lol...HELP!

 

[brock1]

iis probubly your crank seals..they go bad over time it wont hurt andything and its not worth fixing until something major requires it

 

[KCB 850]

Yep, it's what Brock said. I have had the same thing on one of my seadoos in the past. I rode it for two seasons before I rebuilt it.
I also put a clamp on the oil line that feeds the engine case in between uses. That kept the amount of oil in the cylinders to a minimum.

Robert

 

[waata99]

Ok, I have the fuel rail off. Plugs out, oil line to rotary shaft housing clamped...waited 1 day, turned the engine over for a few seconds. At first, oil on rag (over plug holes) was minimal from cylinders, then on turning it over the second time for a few seconds - I got twice as much oil on rag...more from front cylinder than rear. Is this a sign the rings on the front cylinder are bad? If I have the oil line (not from oil pump) on the starboard side of engine clamped how else could I still be getting excess oil in cylinder (s)???

 

[Seadoobuddy]

waata99 - For how long have you had the oil line clamped shut?
If just the last day and NOT since you last rode it then oil could have seeped past the crank seals.

it would be best if you start your own thread on your question. Just copy and paste it into new thread.

 

[waata99]

Ok thanks, I did that.

 

[94seadoox_p]

Yep, it's what Brock said. I have had the same thing on one of my seadoos in the past. I rode it for two seasons before I rebuilt it.
I also put a clamp on the oil line that feeds the engine case in between uses. That kept the amount of oil in the cylinders to a minimum.

Robert

Thanks guys, I was thinking the exact same thing regarding the clamp on the line. Crank seals are the most likely culprit though huh?

I'd like to bounce this off you guys too...I didn't have/didn't know about fogging oil (i know, i know..) so i put a small amount of rotax oil in each cylinder and spun the engine by hand before letting it sit all winter. It also sat with the rotary cover off (ports rag plugged) for the winter as well while I serviced the carbs. Could the straight shot of oil in there have washed out an already frail crank seal? Isn't there also a performance issue with cylinder pressure going by those seals? Thanks for all the expertise here..

 

[94seadoox_p]

Got another 2 cents worth of info here..

This didn't happen until a few weekends worth of usage into this summer. The smoke wasn't immediately after the fuel line/carb rebuild. My theory of the oil pump itself leaking might not hold any water, but assuming that was the case where there was a seal in the oil pump allowing oil to pass, is it possible for pressure from the tank (gravity more or less..) could force oil through the injection lines and into the cylinders?

I also put a clamp on the oil line that feeds the engine case in between uses. That kept the amount of oil in the cylinders to a minimum.

Robert

Of course as I'm typing this, I realized there's another line that goes to the port side of the engine that feeds the crankcase isn't there??...what a dumb dumb, that's where the crank seal diagnosis is coming from isnt it?

 

[KCB 850]

That second line(port side) is the return line. No need to block it off.

Robert

 

[94seadoox_p]

That second line(port side) is the return line. No need to block it off.

Robert

That being the case, the line you're referring to clamping off while the ski sits is the injection line going to the oil pump?

 

[KCB 850]

No, that line with the filter feeds the injection pump, leave it alone. You want to pinch off the one next to it, going to the fitting under the injection pump. It should also be the bigger of the two lines.

See the yellow arrow in this pic.

Robert

 

[94seadoox_p]

Awesome pic...perfect, thanks Robert!