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American SportBike Roadracing Series Thunderbike National

it would be good to know what the machine restrictions are for this series. is it similar to the previous thunder series in that it allows:

- 2-valve twins up to 1200 cc?

- three-cylinder engines up to 900 cc?

- any motorcycle as long as the manufacturers' initials are "H-D?"

what's the scoop? and thx.
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