water in fuel? wrenching is getting annoying now...

so i finished my chop.
put the ski all back together and test rode it yesterday. ran perfect.

so today, i went out to visit some family on the water, so riding from the boat ramp to the boat ( 30 mins ride) it was fine. normal. no probs.

on the 2nd time, i went out, wanting to test the skis cornering performance. so im able to do U turns, at near wot. This ski is the bomb, i feel like jeff jacobs on this thing.

so yes the boat would have taken on some water, as the hood breather holes would have hit the water, thus forcing water into the hood and engine bay.


Now this is where is all goes wrong. im heading back to base, when the ski starts to bog only on WOT, back it off to 80% and it ran fine. So from 0-80% throttle the skis fine, bogs and gurgles at WOT.

So I turn it off, swim to the side of the river. pulled the plugs, ( forget how they looked) i decided to turn it over and then put new plugs in.

I try to start it, and nothing, my uncle comes over on the dingy so tow me back.
SO one last try, no throttle, just the button and she starts but instanly the the entire throtle range is bogging down till it dies out seconds after.


now i didnt put the water catcher back on as stock. instead of having the breather tube going up the pole i just had it pointing downwards ( LOGIC: in the surf if i lost it, when it tips up side down, the pole wont be submerged and thus the water catcher would not such water- this happened last time-i lost the ski and a wave fliped it. upside down, running then erggghhhh..dead. then your done for..so i set it up for this but didnt think about corning hard with possiliy to much water inside.




so back at the boat, i realised that i had turned the reserve fuel switch on as i was coming home ie switching the pump to the BOTTOM of the tank WHERE THE WATER WOULD BE RIGHT?

so back at boat, got it up outa the water, i switched the fuel back to normal setting ( sucking not from bottom), new plugs, cleaned out/turned over cylinders and sprayed ether into it. IT started and i was able to running it, what seemed normally.since it was on land, i just ran it for 7 secs. but it sounded good.


i didnt feel tho it was fixed, so i didnt ride it, getting home now, i thought id see if i could flush it.
so i stared it up. started up fine after using the choke.
i then ran it on the hose for a minute.


then i thought, hmm, maybe ill try running it on reserve, ie to test if there was any water in the tank. so i run it for 1 and a half minutes and then again, it bogged, very slowly, bogged out over 5-8 seconds.



but yeah, pulled the tank, couldnt find any water, doesnt mean it wasnt the problem tho, just means i couldnt locate it.



why would a ski bog at wot for 1 minute. then with new plugs, start and then bogg down at all throttle ranges??
 

khaos

Party in a can!
Site Supporter
Location
Tidewater, VA
Partial clog or flaked debris in the reserve pickup? Little piece of thin plastic in the tank? That could move ever so slightly based on fuel movement in the tube. I would back flush the pickups to be sure its clear. It might not be a bad idea to check the switch itself for less than optimal flow. I know a lot of guys remove the switch altogether. Personally I kept mine.

Just trying to think of an issue easy to remedy.
 
Try to by-pass the fuel switch for a ride. Then you will know if it the switch. Check if your breather valve is working correct on your tank. Lets air in the tank but not out.
 

eastcoastjumper

James
Site Supporter
Location
Long Island
when you ride it at 3/4 throttle and it rides awesome it is because you are leaning it out. @ WOT it bogs you are either WAY lean at that point on the main jet or a size or 2 too large on the main. Riding it at a steady 3/4 throttle is no good.


With all your posts and your rebuilds and everything else you are getting close! Keep it up man.

If it is a single carb just put that fuel line straight to the carb with a small see through filter you can buy at the hardware store. The one that is about the size of an egg, not the really tiny ones. On the fuel pump side of the carb clean out that little filter in there and if you use a pre-filter like I'm talking about you wont have to check the one inside the carb as much.

One last thing is how much fuel was in the tank when it was bogging? If I'm almost out there is no way I'm trying to run WOT back to the boat ramp because i don't wanna blow my sh it up.
 
thanks so much guys for the quick replies, its you who make this site so great. thank you.

It was water in the fuel i believe to begin with as it was the only corner id cut. Ill share will you all the problem as yourve taken the time to help me so you deserve the awnser.

Unfortunately, while the ski was unattended and still in the diagnosing stage, a family member deliberately leaned out the carb settings on the ski, in the hope id cook it. You can choose your friends but not family. luckily the ski bogs out if it gets to hot and lean. learn t this reading other posts, and i knew it wasnt a unspide down head gasket as i wasn't getting any smoke from the pissers.

so i putt it back to stock settings, changed the tank valve since i had a newy and zip tied the fuel lines down then tunned it aiming for dark chocolate plugs, i got pretty close and enjoyed myself today, OMG the water was hotter than the air today in Australia lol ps the new mods are off da chainskis!! the railage/control/handling is amazing. at one point, trying to master the 90-130 degree turn, i got stuck and ended up circling twice in a space no more that 3 square meters !!! was so funny to be hanging on this torpedo , what it would look like from afar, a rouge ski, outa control with a stuck throttle and sterring hahahahahaha

also, ive taken out so much weight that the ski needed a retune anways.... so it all worked out :)


@eastcoastjumper- thanks for the ongoing support, yourve been such a help over the months.Question: why would you blow your engine if your low on fuel??? i can see the connection? something to do with pressure? ps if i ever return to NYC we'll have to hit up the skis dude :)
@ khaos- i checked the tank and nothing, so i recon it was some water at the bottom. as it ran once I put back to ON. sadly, it was tampered with creating more problems.


thanks friends
 

eastcoastjumper

James
Site Supporter
Location
Long Island
If your engine is spinning 8k and you run out of fuel wot you are gonna have a problem! Air bubbles and sucking it dry cause it to surge also and run away.


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okay, ill keep that in mind.
also, when i was tunning my 550 dual carb, i was able to give the back cylinder more mixture by just adjusting the rear carb

how do i do this with the 650sx as its single carb?
 
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