I've got them on the shelf. Coulda saved you a bundle of time and effort.Searched for one a couple months back, nobody? had them anymore. So, I made my own insert. Got a threaded pipe stub, cut off the threaded part needed after threading it into the exhaust port & marking it, then ground down with a dremel till it fit in the exhaust port. Came out great! Helped a little on the low end, but a minor change. The stock Briggs exhaust port is a little large if you're using a bolt-on pipe, rather than a threaded one.
I've got them on the shelf. Coulda saved you a bundle of time and effort.
That's alright, what you did is exactly what I would have done before these came available.
I've never had much success with the hi-temp epoxies that are available.
Yes, an exhaust reducer will def. help as the ex port is considerably too large for the seat size, even with bigger seats and big cam we will install a port reducer.
Thanks and God bless,
Carlson Racing Engines
28 years of service to the karting industry