Hi i have a yz125 an it seems like its missfireing it starts fine an tickes over. it just when u go to ride it its spluttering like hell if you slip the clutch an get revs up hight it will go but otherwise it doesnt want to no

Engine is under max load in the situations you describe, so any weakness in spark or low fuel prssure can cause this, even a weak ignition module.

What are the fault codes. Also it is still missing when you rev it up, the increased engine speed masks the missfire.

is the choke stuck on ?

hi I have a ps 125 have similar issue, but not getting a spark, checked the
wiring and all seems fine, getting volts to coil and stil no spark,
please specify where this c50 clip is located,

thanks

Mark

Give the bike a service and try running some fuel system cleaning additive through the system. It sounds like blocked idle jets. You may have to give the carb a clean ( the internals)

yeah had the same once on a tzr 125 4dl would ride for a short time fine then splutter and die after a couple of mins would start fine and do the same again .. it was the breather on the fuel cap . if blocked causes a vacume stopping fuel from flowing . once cleaned was all fine

Hi there,
I have just had my T4 2.4 cambelt and water pump done but the van does not run right unless the choke is out any ideas?
Many thanks
Mark

Sounds like its starving for fuel. When the engine stops, instantly turn the fuel valve (at the tank) off. Then ck if the carburetor has any fuel in the float bowl.

try cleaning your carb out and make sure the magneato is not rusted