Ms290

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I use a business card. Im not sure what the number is. Just slip the card in turn the flywheel til the magnet pulls the coil to it and tighten the screws.:cheers:
 
My Stihl special tool for this check's out at .007". They are very inexpensive at the dealer (air gap tool for the flywheel). Otherwise I'd suppose you could use a feeler guage. Happy Sawing!
 
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