TS420 can start, but when switch to I, It stopped, is there anybody can help me?

I am not familiar with the saw, but if it runs on choke then dies when you move off choke, then it is likely a fuel/air issue. Electrical, it would have to ground out the coil when on run, but not on choke. Here is the wiring and throttle control blowup.420.PNG
 
Is item 19 in the diagram a slide type switch. If so it could be mounted reversed which would make I off and O on.
 
I would second it as being a possible carburetor issue.

It is nearly impossible to mount the micro switch backward due the mounting bracket design.
1630245383270.png1630245454906.png1630245477729.png

Switch with transport cover.
1630245862202.png
 
I fixed it. the problem is 25. when the choke switch to I, The 25 is too loose, can not give fuel to machine. i just put the 13 the lowest location a little higher to use a little plastic piece to glue to the 6.
anyway, thank you everybody.
 
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