RE: What would cause multiple plug burnouts?
If you are just trying to get the engine to light, use a freshly charged nistarter on the plug instead of the plug boot. I started my AMT280SP this way as it did not have an onboard glow from the ECU. I think though that I made my own 2V (2.4) ni starter with a couple rechargable C cell batteries as anything less than a fresh charge on a regualr ni starter wouldn't light it.