I tried to record these and hampering of the engine braking inaudible these throttling at 30 second and 53 second
https://www.youtube.com/watch?v=-dGjPkLnH5c&feature=youtu.be

The plugs look a little too clean. The inside is still very white. You are not running rich, that's for sure. Try a video with it in neutral. Step up the idle slow and then up to running RPM. I'm trying to rule out anything outside of the engine. Your video almost sounds like someone was blocking the exhaust or the engine brake was coming on when it shouldn't. Might even be the fuel pump acting up too. It is very hard for me to tell you what is wrong not being there and touching the machine. I know it's a pain to bring it to the dealer, but if you can't find the problem soon, your best bet will be them.

Hello, muffler probably does not block it because I thought about it and pulled out the tip of the strainer and continue the same. Also I think about the fuel pump, which should be pressure?

Should be in the manual. It's up top if you don't have it already.

Hello, federimau whether you have solved the problem? I checked the fuel pump keeps the pressure such as manual provides 3.3 bar. I have no idea what it could be, anyone have any idea?

I recorded the fuel pressure
https://www.youtube.com/watch?v=aR1vWN4Z0x0&feature=youtu.be

[2015 Z Force 800 53/Trail EPS]

Not as stable I would have thought it would be but always above 48lbs so I guess it's OK.

Hello, federimau whether you have solved the problem? I checked the fuel pump keeps the pressure such as manual provides 3.3 bar. I have no idea what it could be, anyone have any idea?

Hello, the problem is there, I'm moving slow (3000 rpm) and push slowly the gas and the power is not coming as expected. (when i push harder the gas, the power comes good)

I tried to record these and hampering of the engine braking inaudible these throttling at 30 second and 53 second
https://www.youtube.com/watch?v=-dGjPkLnH5c&feature=youtu.be

I know that this post is really old, but I just got a brand new 2k17 CFORCE 800-2 EPS and the same exact thing is happening at about 30 seconds in this video. What was your resolution to this? It will run like a scalded dog if I open the throttle, but it has this hesitation at low speeds.

the same... it still there