My 505/1a goes 35 at the moment, going to be upgrading to a 12 or higher..
have an expansion chamber on it and its pretty peppy for stock....
I figure that going to a 12 tooth I will get around 38.5 mph
I Figure that going to a 14 tooth (if I it can handle it) could reach 41 mph.
Think shes got enough power for the 13t?
never geared so I would have no clue how it would feel.