How did I miss this thread?!?!
This bike is awesome!!!
I've built a few shifter bikes using the Shimano Alfine 8-speed hub... The bikes had really fast 2-stroke engines, & the hubs never had a single problem & are all still working fine after many years. (The only issue with those hubs is the price... $300).
I've built a few Predator bikes (all with single speed)... This set up has always worked out great.
You can gear the bike kinda tall for over 50 MPH & still have plenty of power to take off without ever needing to use the pedals.
Also... It looks like the tank petcock is much lower than the carb; Is there any problem with the fuel flowing uphill to the carb??