HKO gear shift fork end thickness

Backinthedays

Backinthedays

Member
Does anyone know what the gearshift fork end thickness should be on a HKO 4 speed tranny? My Clymer and Honda shop manual both seem to be refering to the 3 speed when they say the left side shoud be one thickness and the right side another thickness. When I look the parts up at Cycle Parts Nation and Dr. ATV it shows to be the same shift fork for the 4 speed HKO and different ones for the 3 speed KO. Mine both spec out at 4.88mm. :39:
 
6

69ST

Well-Known Member
Unless someone has access to a CL70, SL70, or XL70 OEM shop manual, or a couple pairs of NOS shift forks to measure, don't count on finding these specs. They aren't to be found in 1970s vintage Haynes or Clymer's publications, either.

FWIW, it's been my experience that once the heat-treated layer has worn, the contact points wear quickly. Oftentimes, you'll see where a gear has made contact with the base of the shift fork, when this has happened. Usually, the fingerprint-like machining pattern is visible, or the fork is worn far enough to warrant replacement. Sounds like your set is in good condition; what are the odds that they'd both be worn within 0.01mm and used-up?
 
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