I don't know anything about converting a YFZ carb but know there are kits available for FCR carbs. Call Kenz Cycle Tech and ask him about converting the YFZ's FCR, he has a lot of YFZs on alky. If the YFZ's FCR carb is like the Raptor 39mm FCRs, it should be around $100 for the parts to convert one carb.
To increase fuel flow, replace the stock petcock with a Pingle, they are available directly from Pingle and many of the site sponsors are dealers for them. An upgraded petcock is around $100.
Once you convert your carb and upgrade your petcock, it's just a matter of remembering to purge the carb and change the oil at the end of the day. You don't need any special motor work or ceramic coatings.
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