67` Bomber running problems

[Bryanj]

Honda part numbers are not complicate, the first numbers tell you what it is, the middle three what model first used on last three manufacturer or country code or supercision code so 283 is the model code you need, the supplier said sounds like 280 which is different

[AshimotoK0]

Yes it does have a recessed ring section on one side Mo.

I don't have access to it for a couple of days though to measure again.