Conversation Between taildragger21 and JohnF

Hello, hope all is well, I noticed your old post in re hard to Braveheart engines and would appreciate your expertise on the spark plug. I have been tuning a BH 85 and after two tanks of fuel It seems the plug is no good. It was running fine last time I started it. I cleaned the plug and the engine will pop once but not start. Any ideas are appreciated. Thanks for your consideration.