Hey guys I have a 94 300 4x4. My problem is that everytime I go into water over 2 feet or so or hit a big puddle or like today when I went through a realy big snow bank it tends to spudder and almost die as if I have the choke on or something. it just wont rev up. any clues on to what it might be? I am thinking sparkplug cap Thanks Damian

 

sounds to me like maybe water is getting in the air filter and is being sucked in to the carb. or something like that. just my opinion though. PB500

 

As soon as you get water on the carb vent hose, it will sputter. The vent hose often hangs low where it will get wet. My dual sport used to do this every time I ran through a water crossing.

Correct me if I'm wrong, but I believe the purpose of this vent is to feed atmospheric pressure to the float bowl. This in turn pushes the fuel into the jets. Without that atmospheric pressure, no fuel is getting pushed through the carb, and into the engine. Find the vent line and tuck it up high where it won't get wet. Additionally, you might put a filter on the end of it to keep dirt out.

 

I don't know about the filter, but the fuel vent can get clogged and cause similar symptoms. Mine did. Got the mud out and it runs fine.

Larry

 

If you guys think that it is the carb vent lines then hows this for an idea. A few years back Ski-doo had a H.A.C. system on there summit sleds. basicly they routed there carb lines in to the air box so the air would be the same entering the carbs from the airbox and the vent lines. I did this on my mxz 670 racer and it stoped me from melting down aswell. ( cant wait to se the comments I set myself up for.) By doing this this should stop most of the dirt from getting in my vent lines aswell as water. What do you guys think about this?

 

Sounds good to me. But here's a thought to consider. Air has two kinds of energy. Kinetic energy, and pressure energy. I don't know how fast the air moves through the air box, but if it moves fast, it will gain kinetic energy, and lose pressure. And it's the outside pressure (14.7 psi) which forces fuel through the jets.

I'm no mechanic, and but I wonder if a lean condition would arise. If you narrowed the gap between the outside pressure, and the pressure inside the carburetor, the fuel wouldn't be pushed through the jets with the same force.