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2014 yz250f problem

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Hello all this is my first time using this site so not sure if this thread is in the correct place or not. So I have a mint condition 2014 yz250f that starts 1-2 kicks and runs flawlessly, except lately it has been losing power and bogging down after a few hours of hard riding. It does not fully die but I have to down shift and it will not regain power until 1st or 2nd gear, usually loosing power in 4th. It does not do it often maybe 1 time throughout the whole day. And this has happened 2 times each on different riding days. I figure maybe my air filter that wasn't fully dry could be causing it? I'm going to install an oem piston next week and also back flush the injector and adjust valves. I appreciate any suggestions, really don't want this bike bogging down when I'm heading toward a jump wide open. 

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Welcome to TT!

 

If it happens after extending running, it could be your fuel pump (never let the tank go below 1/2 on a FI bike). A non-FI bike, I'd suspect the spark plug, ignition coil or stator.

I've moved this to the right area of TT for you.

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