Quote:
There may be other differences too Ed.
Perhaps cam profiles?
The earlier versions, when all had 790cc engines, before the 865, the 270 and 360 degree engines had the same power specs.
The 270 firing order is essentially the same as that in a 90 degree v-twin.
Seems to work for Ducati, among others 
My daughter's a physics major (4th year, switched from engineering), I'll see if she can figure it out.
Agreed, the cam profiles coupled with the firing order makes a lot of sense, especially if the lift and duration is aimed at the higher RPM range. 
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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