So I'm trying to definitively tell if I have the notorious 20 mph model. Since we've upgraded the pipe, carb, and variator to get it from 17 mph to maybe 28, it seems likely. Sad, since all I really wanted out of this was ~35 to make it my main transportation in-town.
The problem is, the 20 has gear (etc) ratios that you can't fix with upgrades.
My 78/79 stock Bravo came with a 12.7 carb and 39 jet, so it's definitely a 20 or 25 mph model.
How do I calculate the belt or rear hub ratio, so I can tell definitively where this project is heading? [See jpg #6]
The other thing would be if someone could tell me the difference between the stock [see #7] pulleys and gears. The 25/30 are all different from the 20, so if I could distinguish even one of those, I'd know...