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I THOUGHT I followed the instructions to the letter, definitely got the plug in...

I did think the instructions spec on tightening the two posts was weird and would require too much force to torque it and then bring it to horizontal so I didn't have them quite tight and I thought "hmm, maybe I need to tighten them down and I'm leaking around the posts." Tightened one per instructions and it snapped. Crap.

Either way out of curiosity I tried starting the M3W with NO air filter like in the photo and it had the same rough engine noise so I'd agree about leaking air, I just can't figure out where it might be from... I'll disassemble, triple check the gaskets, and try again (with a fresh post bolt).