Inside look at the Honda igx ECU, STR - self tuning regulator

[Tomos770]

I actually ordered a new carburetor. The engine now runs better under idle, but still not perfect. Still surging, although a lot less than before.
Under load, it runs normal, like before.

Could it be that we are having the same problem @Chrisbowen.
The problem might not be the carburetor at all (again, mine definetly had broken choke butterfly). Rig

Look it up, I for one, never heard of it before. Unscrew the fuel tank, you will see three lines, fuel line, return line (dunno how you call it) and a little short stubby line that attaches directly to a engine block. That's the one.

Little short stubby line....a.k.a impulse line!

So... what if the membrane inside the petcock is worn out, or stuck or something, and the engine under idle speed doesn't produce enough vacuum for it to open?
My hypothesis can be easily tested. I will install a make up gravity fuel tank.
Maybe you have the same problem as me.

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Could it be that this is your problem.....that engine is starving for fuel....

Cheaper ones...

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Or pricier ones...

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