Suzuki DT 75 misfire?

[Gabec1]

My Suzuki DT 75 had been having some issues and stopped running. I swapped the spark plugs but it seems to be sputtering or misfiring. Does anyone have any ideas?

 

[99yam40]

you need to troubleshoot the motor, we cannot

 

[Gabec1]

you need to troubleshoot the motor, we cannot

I’m not sure where to start. I don’t really know what’s wrong. Could be the fuel pump. Any advice would be appreciated.

 

[lakensea]

What are the compression readings? If you are going to attempt to repair this engine yourself you should have a factory service manual and the proper test equipment to diagnose the engine's ignition system.