Engine 12 HP steel sleeve Briggs

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Soonerbob61

Member
I need help getting mine back together.....I took off the old carb (Nikki) and want to buy a new Walbro....are there step by step instructions somewhere that can help me do it right? Also, after I got the carb off I noticed a flat rectangle box with a rubber looking boot (looks like the rubber cap off the spark plug) hanging off of it....I pulled it off and it looks like a round diafram on the flip side of it....I can see the push rods and springs in the motor when I took this part off....what is it?
 
without the model number we are just guessing. It sounds like the breather or what some people would call the valve cover.
 
Soonerbob61 said:
Any idea what that rubber tube coming out of the valve cover would attach to?....or does it not connect to anything?
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That valve spring cover is the crankcase breather. Basically, it is what a PCV valve is for a car engine. Back when I was in the mower business, that tube attached to the carburetor on a Briggs. On some engines it was just open to atmosphere. I've been out of the business for more than 20 years, so my points of reference are a bit dated.
 
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