Any ideas would be appreciated. I have a 2017 uforce 500 will idle fine and will move at 1/4 or less throttle. When given more throttle it will spark knock, smoke and cut off like it's in a bind. I Have checked the valves, took exhaust off in case it was plugged. I was thinking rings but it shouldn't idle so good?

[2015 Z Force 800 53/Trail EPS]

Need to test the fuel pressure and..CPS. Because it idles fine but knocks and smokes above does indicate a problem with spark and injector timing but it doesn't rule-out an issue with the bottom end so..maybe also get an oil pressure reading.