wr500 wont run in water

[jeff2792]

so i bought a wr500 yamaha and it runs great out of water, but once it gets in water it wont do more then idle even holding the throttle full on. but as soon as it comes out of water and sits for a min it will run fine, does anyone have any idea, i have no clue, im lost on this one

 

[WFO Speedracer]

so i bought a wr500 yamaha and it runs great out of water, but once it gets in water it wont do more then idle even holding the throttle full on. but as soon as it comes out of water and sits for a min it will run fine, does anyone have any idea, i have no clue, im lost on this one

Check for an EXHAUST leak:dunno:

 

[jeff2792]

if it was an exhaust leak would the water be going into the crank case?
cus thats what i think it is but not so sure

 

[tor*p*do]

or a head gasket leak (milky plugs)

 

[jeff2792]

nope no milky plugs! so idk my dad thinks water is leaking into the crank case under the pistons

 

[velocity]

Crank seals?

 

[WFO Speedracer]

If water was leaking into the crankcase it would not be running,one drop of water is all it takes to ground out a spark plug so it will not fire!Do this ,crank it up with the hood closed and the unit out of the water,now rev it to the moon a couple of times,shut it off ,open the hood and see if there is any smoke in there.if there is it has an exhaust leak,probably at one of the gaskets at the back of the engine.

 

[jeff2792]

checked it and no smoke...

 

[WFO Speedracer]

checked it and no smoke...

Broken reeds possibly they are stainless reeds on those 500's:laugh2:

 

[jeff2792]

idk? but it will run for about 3-5 min in water then slowly dies down! and i have no idea! i mean what should i be looking for?

 

[WFO Speedracer]

Next time it does that open the gas cap and see if it straightens out,it could be a bad check valve on the fuel tank vent,there are many things it could be.

 

[jeff2792]

alright, well idk next time i put it in water ill check that, thank you guys

 

[Lakeman]

So now you know why it was for sale!!!! Surprise Surprise. I always try to take a used ski to the lake and ride it first before I buy one. I know it is not always practical.

It sounds like a exhaust leak or a gas vent issue.

Good luck.

 

[troy]

so i bought a wr500 yamaha and it runs great out of water, but once it gets in water it wont do more then idle even holding the throttle full on. but as soon as it comes out of water and sits for a min it will run fine, does anyone have any idea, i have no clue, im lost on this one

hey i know its been ages but did you fix the problem. i have the same thing:ugh2:

 

[Thumper333f]

My 750SX had this exact same problem ran like a champ out of the water even ran great hooked up to a flush, but as soon as it hit the water it would hardly run sometimes not at all. My problem ended up being broken reeds from water ingestion. Hope that helps you out troy