Re: Hello there!
Hello and greetings Timo, I'm fairly new here myself and am building my first with a bolt on kit motor.
My second bike I'll build like you are doing. Using a centrifugal clutch the way
Some of the others here and myself have posted photos and information about the Cuban home built bikes called "Raquimbili" (Spanish) that you'll want to look at. We're trying to get the word out all around the world about the Raquimbili
machines. When you look at them you'll understand and see some possible ways to rig your bike.
You're lucky to have an old Briggs & Stratton to work with.
Best wishes and good luck with your project.