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I took a carb apart and soaked the bowl in 100% undiluted SF for two days and it did absolutley nothing. NADA.

The passion people have for the stuff is so intense I wonder if there's something going on behind the scenes.

...like a small commission being paid for every "it most definitely works" claim made on a forum
Good for you.

There is simply no arguing with the fact that on several occasions I have done nothing more to a poorly running machine that added SF or Star Tron and had them smooth out nicely by the time the fuel in the tank was used up.
 
Fuel additives:
Compared to Seafoam, I've had better 'luck' w/ Startron in my 4-cycle mower engines when there's a hunting idle issue.

Can these snake oils fix anything/everything? Nope, but they've most certainly helped me out.

The 389cc Honda commercial engines on my current mowers (Ferris FW15s) don't employ a fuel filter (or an oil filter for that matter). I use fuel/snake oil additives fairly regularly and haven't had any carb issues to date. I'll call that a testament - or a lotta luck. You choose.
there is a fuel filter, it’s in the tank, unless you removed it.


Image


if it has a petcock on the bottom with the tank, it could look like this
Image
 
Fine to use in chain saws, string trimmers, etc, right? My snowblower was revving up and down at idle and I sprayed some in air intake. Resolved the problem quickly.
yes, seafoam works great for breaking up carbon, but it’s not carbon that clogs up a carburetor.

( you’re not cleaning a carburetor by spraying something into the air intake)
 
no, I used to seafoam,, it cleaned everything right out.

couple of squirts in the old intake, I mean nose ..
Try shooting it into your morning coffee - that way you don't get that burning sensation from huffing it
 
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there is a fuel filter, it’s in the tank...
I was referring to an easily replaceable inline fuel filter like all my KAWs had.
Thanks for the pics - that's good to know, though I expected there to be at least some kind of a rudimentary screen. Will take it that it's replaceable...and should be replaced occasionally??
I have two of these commercial Honda engines, one is going on 6 years old the other going on 4 years old. Have never had a fuel related issue thus far. And unless my dealer has replaced these filters during a Winter tune-up (doubting they did), they are the original filters.
 
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