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Hello.
Just popped in to say hi to all.
I live in Canada, and I use a small Ariens ZTR and a Craftsman 7# Torque walk behind.
My question is in regard to my walk behind. I removed the muffler to check for deposits and a metal arm and gasket fell off from behind the muffler. As far as I understand, this is a thermostat. Are there any of you small engine professors out there that can tell me how this works and why it is necessary.
I thank you in advance for your time and efforts.
God Bless.

Hey there - WELCOME to LMF!

I moved your thread to the Small Engine & Mower Repair Forum. :smile:

never heard of a muffler thermostat...why dont you give us the model/serial numbers of both mower and engine.....and take a picture of this weird part

Thank you Reddragon.
Please find attached the information you requested.

B&S# 11 0411 56 80031

Craftsman# 944.361220 041311M 001458


Photos attached.

I'm going to take a wild guess and say I think it's part of the governor linkage.A warm up thermostat for their new Eco-series mowers?

thats what i was thinking....just like old carbs with the manifold choke coil....

Thanks guys for your input.
Excuse me for being so anal but I have this thing about knowing how things work.
As you can see as per the attached photo, this "thermostat" attaches to another arm at the top.
If the thermostat moves as the exhaust temperature increases/decreases, then what does the top arm control?
Thanks in advance for your time and efforts.

yeah...i found it!....its a themostatically controlled choke for your carb :smile:

Thanks guys.
So the upper arm opens or closes the throttle plate?
Sorry to be such a Newby.

no.....the choke plate:smile:....that things way to new to be pulling parts off :laughing: