Todzilla. Get the 13.8. If your shaft is worn -- bike has more than like 15k miles, it will leak with the 14. That's prob why honda revised the spec and changed/updated the own part#. Remove shift lever (first mark index on shaft with white paint so you line it up same way later) Pull the side cover - ezpz 4 m6 screws. Wear gloves it's messy in there from your leak, dirt ingestion (it's open at the bottom) and chain lube spit-off). You will prob find it easier to get a couple little #6 sae self tapping screws at the hardware store and at 180 degrees apart screw em a turn into the seal. Grab each screw with a vice grips and pull straight out. No picking around and scratching the ridiculously soft aluminum seal seat (learned that on the first cb500 I did). Clean in there really well. Feel the seat for burrs or cracks. Feel the shaft where the seal sits. There a prob a groove or some roughness that tears the seal up as you shift. Use scotch brite- NOT a file- not steel wool. Be gentle and slow and remove the leat amount of material to make it smooth to the touch. Previous poster had good suggestions for installing the new one after the seat and shaft are ready to recieve. Just keep the shaft and the seat really slimy with motor oil or 3-1 before you slide the seal on. And protect the seal for the razor sharp splines on the end of the shift shaft. Should be good to go
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