- Jun 30, 2012
I think luck has a lot to do with many things, but an A65 also has a heavy crank. The Triumph Saint has a light crank and is slower then a pre-unit Tiger 110. When I looked inside mt 850 and saw that crank, I could not imagine racing with such an ugly thing. I now believe in it - It actually works. But NOT with the standard gearbox. When you peak the 850 motor out to 7000 RPM in every gear, and race-change with close ratios, the bike really gets mobile. But if your revs drop below 5,500 RPM, you have to wait until they come back up. In most situations, that never happens. Once that crank is spinning high, nothing stops it. I love it.As the last A65 was made in 72 how does that work, the Devimead conversion was not factory that does not count and anyway was available in the late 60's as the owner was using A65 engines in his racing sidecar.
On Winton Raceway, the slowest corner is a hairpin which requires second gear in the close box. At the slowest point in the corner, my 850 motor never drops below 6000 RPM. How you get around that corner determines how good you will be everywhere else on the circuit. It has 5 straights and 12 bends in 3 kilometres. I run relatively high overall gearing.
With the heavy crank, the Commando is very different to many other bikes. With most bikes, if you lower the overall gearing, they accelerate faster. If you do that with a Commando engine, it usually just does the same revs and the bike does not accelerate faster.