The heat shield on the expansion chamber

That really nice pipe work. Mine´s looks awful this days, I have to take the time to finish properly. Unfortunately I don´t have access to an inverter solder machine, so I do the welding of the pipes with the conventional arc machine :S not an easy job for someone used to work with 40W solder
Thanks for the pic

Thanks. Pipelyne has two TIG welders at the shop.

what kind of engine is that

It's the same motor as the rest of our bikes. A 5.8hp Morini motor with an aftermarket reed cage with carbon fiber reed petals. IMO its definitely the best motor for Motored Bicycles.

where can u purchase that engine