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i owned 2 of their near cousins, the CL77. i loved those bikes and wish i had one now. same drive train - the Cl was just outfitted with the scrambler gear instead. really distinctive sound if you removed the can and added snoffernots.
Snuff-or-Not , basically a washer on a pivot pin across the back of the muffler . Bob Pirsig rode a Super Hawk . TS
That is the motor that inspired the Laverda brothers to build a very similar 650 model.