95 xp Carb Question

[kicker]

Is it normal for fuel to drip down the inner venturi while the seadoo is idling at 3000 RPM out of the water. My understanding is that the only way for fuel to get in there is past the needle and seat, which are new.

They have been rebuilt twice now. After the first rebuild they would drip through the venturi after the engine was shut off, which would flood the engine and make it very hard to restart.

Now after the second rebuild they dont drip after it is shut off but fuel does come through the inner venturi during idling, out of the water. Is it possible that the needle lifts a bit because of the high idle rpm and vibration, or do new needle and seats need to jell together a bit before everything seals up? Pop off is set at 46 psi, and pops nicely.

 

[Sportster-2001-951C-Stock]

Is it normal for fuel to drip down the inner venturi while the seadoo is idling at 3000 RPM out of the water. My understanding is that the only way for fuel to get in there is past the needle and seat, which are new.

They have been rebuilt twice now. After the first rebuild they would drip through the venturi after the engine was shut off, which would flood the engine and make it very hard to restart.

Now after the second rebuild they dont drip after it is shut off but fuel does come through the inner venturi during idling, out of the water. Is it possible that the needle lifts a bit because of the high idle rpm and vibration, or do new needle and seats need to jell together a bit before everything seals up? Pop off is set at 46 psi, and pops nicely.

I agree, it's vibration. Check under normal conditions idling in water!

 

[Minnetonka4me]

Did you replace the new needle and seat? Ive had bad ones new out of the bag...

 

[kicker]

Yes, I did put a set of new needle and seats. The chances of both being defective I would think is slim, but who knows. At idle both carbs drip through the inner venturi the same.

Would there be another component that would make this happen? I could have made the same mistake on both carbs.

 

[Minnetonka4me]

Are the kits you used OEM or OSD? regardless, bend the N&S levers inwards just slightly...Diaphragms must be pushing on them just slightly.

Only other thing can be low pop off and your not low...

 

[kicker]

I did use the mikuni rebuild kits and OEM needle and seats on these. Had bad luck with WSM diaphragms before.

Ok I will bend them slightly and see what that does. Right now they are set flush with the top.

 

[Sportster-2001-951C-Stock]

Let me add, I wouldn't get overly excited about a carb's tune based on how the ski runs unloaded on the trailer unless perhaps it was plainly obvious it wont run/start in the water. Also, the fuel pressure is most likely higher idling at 3000RPM no load on the trailer than it would be under normal conditions, contributing further to the witnessed phenomenon.

I think you have to splash it to confirm something's amiss.

 

[kicker]

Let me add, I wouldn't get overly excited about a carb's tune based on how the ski runs unloaded on the trailer unless perhaps it was plainly obvious it wont run/start in the water. Also, the fuel pressure is most likely higher idling at 3000RPM no load on the trailer than it would be under normal conditions, contributing further to the witnessed phenomenon.

I think you have to splash it to confirm something's amiss.

I have the idle set and it seems smooth, I can braap the throttle and there is no hesitation, which is fairly easy to do out of the water. So, no, there is no obvious issue here. i will put the air box back on and wait for the ice to melt.

I have never noticed before if my other skis dripped fuel through the inner venturi out of the water, little harder to notice on a 787 because of the angle.