JD kit will get you close enough with minimal effort - it just costs about 2 or 3 times more than if you bought the parts yourself. You're just paying for their research and convenience. If you want perfection, that is a never ending game.
Keep in mind the needle will have 4 characters stamped at the top, this is good info to have. These are the weakest point in how the Gassers are shipped. No clue what Christini is sending out the door. Everyone seems to be having good luck with the N3xx needles. If you go with JD you will likely be happy.
I wouldn't use the owners manual to derive ratios. Most oil manufacturers have their own recommendations on the bottle so the brand you are using is more important than what Christini/GasGas suggest, in my opinion.
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