I have a Grizzly 450 and when i was riding through water (not deep at all, not even to the floorboards) and water splashed up everywhere and got all over the engine(very cold water from a creek) and after a while of doing this with splashing water everywhere the engine sputtered a little and for a while. I let it idle for a minute and it worked fine. I checked everything(the airfilter, oil, water in the belt to make sure there was nothing hurting the engine) it was all clean and dry. Does this just mean that the engine got so cold that it sputtered and needed to warm up or do they usually dont act up from cold water and that would mean that there is something wrong with it? Just making sure.

 

You probably got water in the radiator. I've done it on my brother-in-laws Polaris ripping through water holes. Before knowing about the petcok (?) valve, I had to wait about 15 minutes before I could ride, as it would just rev in gear but not move anywhere. It felt like the belt was slipping or like a blown clutch on a manual transmission.

 

So it is normal

 

I had the exact same problem with my bruin 350. I think what is was is that steam would go into the air box and would kinda chock the engine. But i never found a way to fix it.

 

i think thats what must have happened