Buy 90014-286-000. Do not buy the listing whose description says 90015-286-000. The rotor bolt on this 1976 CB500T was damaged. The Honda number is the rotor setting bolt, and it is shared with the CB350, CB360, and CB450 twins, which is why a used one from those engines is a real spare. A US shelf was not holding a new one when this bolt was being hunted. eBay listings for the number, a Honda dealer's parts counter, and the vintage specialists who bin these fasteners were the places left.
The number on the invoice
| Number | What it is | Cart | Shop |
|---|---|---|---|
| 90014-286-000 | Rotor setting bolt for this twin | Yes, if the seller's own text says that number | — |
| 90015-286-000 | The sibling that showed up in an Amazon description | No | — |
| A 10.9 bolt you measured | A match for diameter, pitch, and a length that does not bottom | Only after the Honda bolt is unavailable | View A 10.9 bolt you measured (affiliate) |
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There is no Amazon link for the Honda bolt. The listing that appeared for the right search carried the wrong number in the description. A wrong length is worse than waiting. Too long, and the bolt runs out of thread in the crank before the head clamps the rotor. The rotor then walks on the taper.
Thread the new bolt into the crank by hand with the rotor off the taper, or at least before it is asked to clamp. Fingers should carry it all the way to where the rotor face will be. If it stops early, it is bottoming, and tightening it will not pull the rotor home. Clean the taper. Dry, no oil. Torque to the figure in the CB500T shop manual, with the wrench that starts at 20 ft-lb only if that figure sits inside 20 to 100. Check it again after the first heat cycle.
A starter that whirrs and does not turn the engine is not this bolt. That is the starter clutch.