I'm really liking that exhaust.
You should show up to the Detroit minibike races with that. LoL, It would be a hit.
Can't wait to see what cam you teased us with.
Waiting for episode 5.
The exhaust system was one of the hardest sub systems to put together. The primary concern was not to lose any power while trying to quench the bark of the 212 cc engine.
The cylinder head flange was purchased on ebay for $8.00 The Sport bike muffler came with the adapter flare and that was also purchased on ebay for something like $60.00
The one inch in diameter exhaust pipe is somewhat controversial .... its electrical conduit. Before welding the conduit, the ends were dipped in muriatic acid to remove the galvanized coating. It takes about 10-15 min in the acid bath to fully remove the poisonous galvanized coating... never weld galvanized metal.
Anyway, the exhaust has a nice tone and after it was fitted the engine was running a little bit on the lean side... which is sort of good, because that allowed me to change the carb jet for more fuel.