heres another converter that will give you mph in all gears.. Banshee Gearing
ok, thats not really true. a properly tuned banshee could be held wide open forever provided fuel flow never stopped. a fuel pump would be an easy fix for this. and on the subject of stock vs modded, id rather take my 10mm cub motor 5 miles pinned before a stock cylinder motor.. cub cylinders are much more reliable than stock cylinders, especially when it comes to transferring heat. the water jackets are much larger than stock, allowing cubs to stay cooler.