125m starts but runs wide open HELP!!!

[Huffa]

If it's not too much trouble just take the air box off and observe thru the back of the carb throat (if you can) what the slide is doing while operating the throttle.

If operation checks out A-OK, start it up and spray D-40 all around intake area and head gasket area, the second the liquid seals the leak (if there is one) the engine should go back down to idle for just a second or two, then back up.

You may very well have a cracked dry rotted intake boot which is between the carb and motor or it's just not tightened or the gaskets are bad.

[jenndnn3]

It could be: (alot of folks mentioned these I just added a few)

Air leak: Spray starter around carb and intakes, fulley enclosed air box? put the lid back on. Jets clogged.

Slide piston sticking: causes bad throttle line, in backwards. Bent neddle?

Main jet open: open or sitting at bottom of bowl.

Air screw missing? I hope thats right name, its the one you dont seat, and only turn 1, 1/2 turns out.

These are the only ones I can think off off top of head.

[42F67N]

got it running like a champ turns out it was the screw that goes into the slide it was bent the guy before me must have installed the slide wrong and tryed to jam it down in bending the screw with the screw bent the slide wasent going all the way down in, once i took the screw out and got it straight the idle was perfect thanks for all the input and help guys