Yamaha's factory flattrackers??? Anybody know.......

racerdave

^ Gone not forgotten ^
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When Yamaha was backing Kenny Roberts flattracker 650's, were those motors rephased 750's? I know they were bored 650's.
 
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I have read there were 200 special 750cc motors made (to meet AMA rules) with special serial numbers, can't find it now
 
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