2001 SX250 running rough

[Kurt_Lysne]

My 2001 SX250 has started running rough.

I have:

Checked the fuel filters and quality of fuel.

Cleaned the oxygen sensor.

Changed out the spark plugs, they were all dry and looked fine.

Those steps produced no change.

A few years ago a bad fuel pump was the culprit. Any thoughts before I spend a hundred bucks on 3 fuel pumps?

[99yam40]

take them off and check them

[Kurt_Lysne]

Done that, they appear okay. I worry about assembling and reassembling them. But it appears the went back together fine. No change in the missing.