I found this on another forum: "Is there a place where one can go to find out the honda numbers that supercede old numbers? I am trying to find out if 13103-400-010 is equal to (old No.) 13102-400-000 or if these are interchangeable parts."

"Those 2 part numbers would be interchangeable. The last 3 digits generally only mark small differences between interchangeable parts. Usually it is color or manufacturer or sometimes size. 000 is usually the first issue. Then if it goes onto a second model with a slight change such as black rather than chrome for instance, it will get the 010. Lots of times you will see 671 and 672, that may indicate a different manufacturer such as ND or Hitachi on electrical parts. The other time when the last three are important is if you are getting original Honda carburettor jets and the last three are the jet size so it does make a difference."

This makes sense to me as I've seen the part numbers on interchangeable parts between the two generations differ slightly. Can anyone else confirm or deny this info? Would be a great tool for finding replacements for parts that show as no longer available.

when I look up parts at babbitsonline.com they show the old number with strike-through and the revision part number in red next to it.

Looking at cheapcycleparts.com, which I'm pretty sure uses the same parts fiche, I see the accelerator pump assembly is no longer available for the first genertion carb. The same assembly, which I thought was identical, is still available for the second generation carbs. Questions, questions.

Interesting !