RE: briggs 4 stroke prop?
Heres a a few pics of a similar Ryobi I did last year. Set up to run gas/glow. Turns an 18-6 well over 7K. I would suggest dumping the stock carb. Runs very well on a 2stoke 2 needle carb. The carb on this one is a WT 220 off a Homey weedeater I believe.