You need a base line to tune from. Being that you have un numbered jets you don't have a baseline. The slide carbs tune differently than a CV carb in that not only will you be changing out the jets but also needle, needle seat and in some instances the barrel slide. When a slide carb is used on say a Honda dirt bike the factory will tune that carb for the bike. Unlike a cv carb If you have the same size carb on say a Honda and KTM bike of same cc engine they could be tuned totally different since a slide carb is more of a custom tuned carb as compared to a cv carb which is universal. Not only do the jets need to be numbered also does the barrel slide, needle, and needle seat. If not you will be shooting in the dark. Also a flat slide is more difficult to tune than a round slide. I would return that carb to get one that is numbered properly. Or you can spend the extra money for a Mikuni VM26 series 606. I would also pick up a book which instructs how to tune. They require more to tune but when tuned properly, performance is unmatched as compared to a cv carb. Also a flat slide is more temperamental to elevation, temperature and humidity as compared to a round slide.
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