Rode a 69 Victor scrambler many years ago in a hillclimb. Mikuni fitted and it ran fine but I don't remember if there was an air filter on it. Put the same carb on my 67 T100 and it ran fine as well. The Victor pulled so well that after my first successful run to the finish line, I somehow decided to test it in a loop about half way up. Did that well too..........Don't know about the jetting as it was borrowed from another Victor Scrambler. It was even easy to start!!! Someone will have more details.