Transcription
Fighter: So uhhhhh... you gotta pretty neat weapon there.
Artificer: Thanks, designed "Ol Buzzy" myself!
Fighter: Mind if I give her a go?
Artificer: Sure, but you need any pointers?
Fighter: Naaaaaw, I can figure it out.
Artificer: *To the DM* CAN he figure it out?
DM: *To fighter* ...roll me a wisdom check.
Fighter: *Nat 1*
DM, Artificer, and Fighter in unison: Hoo boy.
[A picture of a man starting a chainsaw while the blade is placed between his legs, resting on his crotch.]
A gas chainsaw has a centrifugal clutch, so if it was "stuck engaged" the chain would move with the starter cord. You'd know it before you gave it a real yank.
If you're starting with the choke engaged, it's possible the engine will idle at a speed high enough to engage the clutch and move the chain. 2-stroke engines aren't real anyway, they're bullshit wrapped in metal that works because the fossil fuel industry demands them to, so their behavior is entirely unpredictable and contrary to the operator's needs.