I had a problem, replaced my low-compression E50 hi-torque top end with a used stock 50 kit, still not kicking over. I was super confused, I thought I had fuel, my plug was getting wet, seemingly good compression (didn't test it) and my spark plug, althought a little fouled, had seemingly good spark. Bought another BH6S at Orielly's, put it in and blam, fired right up. My E50 seems to be a bit picky with it's plugs, sometimes it'll work on one, other times not. Try a brand new BH6, it might fix your problem if you'v been using old plugs.