I’m new to this page but I was hoping to get some help. I have a 2016 Yamaha Kodiak EPS 4wd lately I have been noticing problems with it. When I press the throttle it either bogs down or cuts off. When I go in water it cuts off either when I let off the throttle or at random moments when I’m riding. I’ve replaced the spark plug multiple times and it’s never seemed to be the solution for it. I’m thinking it’s either the injector or a bad wiring connection but I’m not sure. Anybody ever had this problem before?

 

Not on Yams, but on other fuel injected bikes it is often a sign of the filters needing changing or cleaning. Go for easiest first, I think that will be the injector filter. Remove injector and blow it out with compressed air, you can't blow through it, but dirt in the internal filter will get blown away. If that doesn't work, fit a new "tea bag" filter to the fuel pump. A dirty filter wouldn't give extra problems in water though so you may have a short or wiring plug fault. This should be detectable by the EFI fault diagnosis system, so taking it to the dealer may provide the answer.