my bike is stock and it does the same thing. I have to keep on the gas to keep it running.
It could be the steam from the engine causing condensation to get in to the air box and carb. Yamahas have that problem bad.Not trying to jack a thread but I have a similar problem. When I hit about 1 foot of water at a decent (approx 10 mph) speed mine starts to die and lose power. I can keep it running and it clears up after a few seconds. If I go slowly through the same hole, no problems. I am splashing water on something that is killing it. Could this be related to the problem with the tail pipe stalling? I have greased most of the wiring plugs I have found including the spark plug.
Yep it would sputter and hesitate, when I hit the water fast. I think it was the steam build-up around in the stock snorkel. No probs after the snorkel.I think truegrit said he had had a problem with that before he put on his snorkel