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The reason people don't use the OEM mechanical advance on a CB160 race bike is that the advance is all in before 4,000 rpm....about the only time you'll be below 4,000 rpm is in the pits.

OEM advance is mainly for starting issues...allows them to run a low advance for easy starts and stable idling. On a race bike the timing inaccuracies caused by the slop in a mechanical advance is far more of a disadvantage than the lack of low advance at idle and just off idle rpms.

I'm pretty sure the intake flanges I sell here: http://www.jrbranson.com/BikeParts/CDR-Parts.htm
will fit a 160...but I could be wrong. I just use a pair of these and weld on a slightly curved section of 1.125 OD tubing and clamp the carb spigot to the tube.
JohnnyB
 
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