Coil lash? I know what you meant. (deleted wrong info) I had read somewhere that a business card was the right size for the coil gap. That was bad advice, motor would barely start. I've also read 2 business cards but after the 1 card experience I said F it and bought a new set of guages. That worked. ARC wanted .030 for the billet flywheel coil air gap and it runs strong once I got the jet right.