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JP,

Mark E. from this community helped me free up a sticky valve in my B&S-powered Snapper mower. He recommended running some Dextron ATF into the carb while running the engine. It smoked like crazy but really helped.

Yours isn’t yet running of course, but I think the ATF idea has some verifiable merit. Dextron in particular, which Mark E. prescribed specifically.

Not sure about the acetone mix idea, because while the aggressive solvent idea also has merit, it seems to me acetone would undermine some benefits of the ATF/Dextron.

Maybe beginning with acetone then switching to ATF/Dextron after a bit of progress with the solvent?

And if that allowed one to free things up and get it firing, I’d be tempted to trickle some Dextron into the carb at idle to further scour/lube things up throughout.

The Dextron trick saved me the need to pull the head and perform surgery! (Many thanks, Mark E.!!!)

Disclaimer: I’m no mechanic! I suppose it depends how much effort one intends to make (or save) to breathe life back into the old girl.

Best,
-C3

<blockquote data-quote="-CӞ" data-source="post: 254876" data-attributes="member: 18670">JP,Mark E. from this community helped me free up a sticky valve in my B&amp;S-powered Snapper mower.&nbsp; He recommended running some Dextron ATF into the carb while running the engine.&nbsp; It smoked like crazy but really helped.Yours isn’t yet running of course, but I think the ATF idea has some verifiable merit.&nbsp; Dextron in particular, which Mark E. prescribed specifically.Not sure about the acetone mix idea, because while the aggressive solvent idea also has merit, it seems to me acetone would undermine some benefits of the ATF/Dextron.Maybe beginning with acetone then switching to ATF/Dextron after a bit of progress with the solvent?And if that allowed one to free things up and get it firing, I’d be tempted to trickle some Dextron into the carb at idle to further scour/lube things up throughout.The Dextron trick saved me the need to pull the head and perform surgery!&nbsp; (Many thanks, Mark E.!!!)Disclaimer:&nbsp; I’m no mechanic!&nbsp; I suppose it depends how much effort one intends to make (or save) to breathe life back into the old girl.Best,-C3</blockquote>

[QUOTE="-CӞ, post: 254876, member: 18670"] JP, Mark E. from this community helped me free up a sticky valve in my B&S-powered Snapper mower. He recommended running some Dextron ATF into the carb while running the engine. It smoked like crazy but really helped. Yours isn’t yet running of course, but I think the ATF idea has some verifiable merit. Dextron in particular, which Mark E. prescribed specifically. Not sure about the acetone mix idea, because while the aggressive solvent idea also has merit, it seems to me acetone would undermine some benefits of the ATF/Dextron. Maybe beginning with acetone then switching to ATF/Dextron after a bit of progress with the solvent? And if that allowed one to free things up and get it firing, I’d be tempted to trickle some Dextron into the carb at idle to further scour/lube things up throughout. The Dextron trick saved me the need to pull the head and perform surgery! (Many thanks, Mark E.!!!) [B]Disclaimer[/B]: [I]I’m no mechanic! [/I]I suppose it depends how much effort one intends to make (or save) to breathe life back into the old girl. Best, -C3 [/QUOTE]

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