I'm interested to see that the builder states that he has so far been timed at 86mph using a GPS speedo, and reckons to see 90mph soon.
So, how fast is a flathead? I don't want unsubstantiated claims, or good oi' boy stories, but actual proven figures.
I've reckoned over time that a military spec WL is good for something over 65mph and comfy at 50-55mph, which would be comparable to British 350cc-500cc ohv singles of the era. Lightening the bike a little and raising the gearing might get a genuine 5-6 mph more.
My original Ariel-framed WL was timed at 81mph at Snetterton, flat out with rider in leathers at a VMCC road racing event. That's a bike about 85lb lighter than a WL, fitted with an Amal carb, geared at about 20% higher than a stock WL and given that the Triumph 5T would just about do 90mph with 26-27bhp and a lighter bike, it seems about right. It would certainly do a genuine 75mph in road trim.
I've seen WRs quoted as making 40bhp, and being capable of 105mph, which seems a feasible combination provided the power output is true.
So, what will a 45 really do, either in stock firm or stroked?