4 Stroke surging

[MegansDad]

This particular problem is on a 21 YZ250f dirt bike but it could happen on any machine. 
 

Getting a surge or hiccup at about 60-70% throttle then clears up. Low end is fine. I knew the plug was not the problem but changed it anyway and no different. 
I’m thinking(hoping) fuel pump but looking for advice where to start. 

 

[Fireballsocal]

Has the bike sat for 6 months or so?

 

[raspadoo]

I believe you can change mapping with an app, you try fattening up mid range? 

 

[MegansDad]

Has the bike sat for 6 months or so?

Bike is used almost every weekend so I don’t think bad gas is the problem. 
 

 

[MegansDad]

I believe you can change mapping with an app, you try fattening up mid range? 

When we first got the bike I read up on all the mapping you can do but decided to leave it at factory settings. It did cross my mind that could be an issue but I don’t think the bike would change mapping on its own. 
I do use the app to track hours for service. 
Looked at the app when this happened and everything looks normal, no fault codes. 

 

[Fireballsocal]

Bike is used almost every weekend so I don’t think bad gas is the problem. 
 

I was thinking junk built up in the injection system. There still might be something in there stopping correct fueling. Is this a symptom that just popped up or something that has always happened with the bike?

 

[MegansDad]

I was thinking junk built up in the injection system. There still might be something in there stopping correct fueling. Is this a symptom that just popped up or something that has always happened with the bike?

New issue. Bike has been flawless since day one. 

 

[raspadoo]

As well as fuel pump, Id check the TPS (though that usually surges at idle), valves and timing.