125-200cc CR125 Water in Float Bowl After 2-foot Water Crossings??

[dfeckel]

On two separate occasions, my '08 CR125 has stalled out on the far side of a short but deep-ish water crossings. The first time was about 1.5 feet of water, revving the bike pretty well to churn my way to the other side, and it died just as I emerged at the other side. I pulled the plug and cleaned it off, but no start. Noticed after removing the plug a second time water droplets on the plug, so I drained my float bowl and the bike started immediately.

The second occasion was today, and the crossing was more like two feet. Same situation. I figured it was water in the float bowl, so I drained it and the bike started again first kick. I didn't bother pulling the plug this time.

I am using the Uptite carb vent filter with the single "in" line T'ed off and one end run up to the air box. My overflow line is stock and hangs down 6 or 8 inches below the linkage.

I am certain the water was not high enough to block off the T'ed vent line in the airbox.

How is this water getting in my float bowl???

 

[surfer1100]

Airbox drain sealed?

 

[dfeckel]

I suppose some water could be splashing into the airbox, but how does it go from the intake to the float bowl?

 

[Norman Foley]

Fuel line from petcock to carb clamped tight?

 

[hipsterdufus]

my cr always tried to stall midway through any water crossing, i added my usual 7602racing carb vent line filter, these have 2 extra ports: ran 1 line up behind the headlight, 1 up into the airbox and it blazes through water without a hitch

sounds like your carb needs more than just your 1 backup line

http://www.7602racing.com/prod_t6cf.php



hip

 

[Norman Foley]

my cr always tried to stall midway through any water crossing, i added my usual 7602racing carb vent line filter, these have 2 extra ports: ran 1 line up behind the headlight, 1 up into the airbox and it blazes through water without a hitch

sounds like your carb needs more than just your 1 backup line

http://www.7602racing.com/prod_t6cf.php



hip

I missed this... You need both top vent tubes going up.

 

[dfeckel]

After the first drown out, I suspected the single line running down from the T might have sucked up some water. So for this last ride, I ran it up towards the airbox, too. So, all carb vent lines were up at about the level of the top of the airbox, i.e., nothing hanging down (except the fuel overflow hose).

Can water drawn through the air filter settle into the float bowl, or will it all just get pulled into the engine? I pulled my airbox yesterday to clean it, and there was no shortage of muddy remnants inside it, especially around the big rectangular "drain" at the bottom. Maybe once I really get the rear wheel churning water up, some water gets drawn up through that drain, through the filter and enough gets into the float bowl to kill the motor? I just can't see water being drawn into the vent hoses, or even blocked off since they are both higher than the water level.