briggs and stratton model N

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recently picked this up. I really wanted to see if anyone has any reliable links on researching what it is, how it works..

i mean, its a motor so its the same platform (gas-air/spark/exhaust) but i wanted to know how the carb mixes air.
how the exhaust is mounted into the head. how the valve springs/rockers work. why there is a weird intake tube. how to go about cleaning the carbon off the piston head. how to repair any issues with the crankshaft or connecting rod.

id like to know something about what I'm doing before i take it apart.
i can post what i find on this thread for future peoples research.

thanks in advance for anyones help.
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