When a engine starts to kill plugs, better to stop check all the things on this checklist:

- Is the conrod in good shape (nothing slope on the big end or small end). Check the crank pin. Dino may post the measurements regarding crank pin.

- If the crank pin is ovalized, stop using it, will kill all the conrods you put on this engine, and change the crank or buy a new engine (sounds rare, but sometimes can happen).

- If piston and plug button is pitted, you're run your engine with a very small chamber for your nitro percentage. This can be too the cause you kill so much plugs. Looks the filament distorted? check your carb adjustment, probably you're going too lean.

- Regarding plugs... which kind you're using (number and type of body) along your nitro percentage. Looks the filament distorted and pushed into the cavity of the plug? (excessive compression) or looks pulled out the cavity (excessive scavenging - your engine may be putting serious power then).