What is that exhaust? The tailpipe is huge!
This is my old SIP Road 2. I used it with long chromed decorative pipe, but it was bad idea - tailpipe was cracked and I losed it on the road. I went to my welder and he have on hand only 27mm pipe and I had no time to wait or search for smaller pipe. So he weld this big pipe.
At the end there is Polini Box on this engine. I put my SIP only for test.
That engine sounds great and should be a solid runner. No reason you shouldn't get 18 or 19 HP out of it without too much effort of the port timings are good and the exhaust is up to the job.
I'm very excited too about how this engine will run on the scooter. But it owner now in the frontline defend our country from russian invasion. So only after our victory.
Those Kyiv backyard sheds look a heck of a lot like the sheds in Belgrade btw.
It is not a backyard. It is so called "garage cooperative" - big guarded territory with a lot of garages(can vary from 20 to 500)