There has been a lot of turmoil in AMA Superbike since DMG took over last year. Most of the manufacturers have pulled out all together. Most notably Honda, who used to be the big series sponsor. DMG has turned a lot of people 'off' with the new rules format, class structures, and organizational issues. I'll keep my personal opinions to myself, but you can search all the major MC/racing sites on the net for the full story.
Don't know why their not competitive in WSK. Could be that they are just having a rough couple of seasons.
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