Weird issues with KPX 250?

[EllenG]

Mine has been running alright overall, but lately I've noticed some odd lirru things that feels like it's lagging a bit in the mid range, especially in 3rd and 4th. First thing that came to my mind was fueling but I doubt it is, maybe gearing, or something else. I haven't done any mods yet, so it's all stock for now.
Figured I'd check here first, although its not too serious tho but I'm really not a fan of waiting around for something to get worse or not

 

[LifAmRod]

It seems like a start of a performance dip?
Given it's stock, have you checked the air filter recently?
A partially clogged filter can definitely cause midrange sluggishness.
Also, it's worth to do a quick spark plug inspection.
Sometimes they can look fine but be starting to foul, leading to an inconsistent spark under load.

 

[Leafchaser]

It seems like a start of a performance dip?
Given it's stock, have you checked the air filter recently?
A partially clogged filter can definitely cause midrange sluggishness.
Also, it's worth to do a quick spark plug inspection.
Sometimes they can look fine but be starting to foul, leading to an inconsistent spark under load.

Might as well check the fuel system. Something clogged or the pump going bad. The symptoms point that it could be issue

 

[Aangie]

If it's lagging in the mid-range and everything's still stock, that might be the factory tune holding it back, these bikes are often shipped overly lean or restricted just to meet emissions, not to run their best