Oops, forgot about that. If this is a stock ryobi conversion, its pretty hard to get the timing wrong since its fixed. I initially had a .050" gap and an intermittant spark. Using the business card got me a good spark. Unless the shear key is broke, timing should be ok. Since it runs on the bench, I wouldnt work it from a timing issue. Is it inverted? Is the plug getting wet when you prime?

Edwin