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A recent experience...received inexpensive copycat carb kits for Yamaha Banshee ATV ...ordered because I needed gaskets/orings but also received main, pilot jets and needles......totally UNMARKED as to sizes. Installing unknown sized tuning components on a guess? No way.
I opted to restore/reuse Mikuni originals.
I could have measured, compared...but an unnecessary process with unmolested, confirmed correct, restored originals in hand. Not worth the gamble, I returned all the unused, unknown kit peripherals to the owner with the explanation.
You can not visually determine comparative tiny jet sizes..and AFA using unmarked? Even if the bike does run ok (but will it?) ...what about the next owner or poor sucker who gets to work on the carbs 5-10 years from now? A future trouble causing guessing game. Advisable to use only OEM marked components....established, marked and known as to size reference and correct application.
FWIW...YMMV....my .02
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