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I don't know how good the Atlas engine is.  If the pistons are lighter it might be better.  With the one Bob has, he fitted with MAP pistons and rods, and the balance factor is around 80%. Many years ago (1963) I watched Jack Forrest at Bathurst beat all the Manx Nortons with a 650SS.  He really gave my mate the shits. Forrest was a works rider for BMW,  he used to tell the other riders he was going to beat them, and then do it.

I have ridden a 1961 500cc Manx Norton - it was quicker in corners that it was slower down the straights.  A Commando is probably double that. A featherbed Commando might have a problem with weight distribution.  You would not know until you tried to race it.  I saw one at a race meeting a few years ago.  But the kids tend to ride around the bike and not fix the problems.

I usually know when I am likely to crash, from the feeling in my stomach when I am in the middle of a corner. I learned to race by crashing.


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