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04 crf450r, FCR 40mm carb on a xr650l


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Got the FCR carb in the mail, took it apart, interesting. I've been taking bike carbs apart since i was a kid, (50yrs old now), all of them pretty much the same. Never seen one like the FCR's, main jet, pilot jet, starter jet, air pilot jet, leak jet, acc pump, needle thats 5in long, i'm impressed. funny, they finally update the carbs and every thing's injected now.

It's got the stock jets for a 04 crf450r, main 170, pilot 45, NCYR needle, From what I've read, when installed on a xr650l, most use the pilot 45, main 158 to 165, correct? I'm at 1000ft , but mostly ride up to the mountains, say 5000ft max. so all I really need to change is the main? any jetting help would be appreciated. Still need to get the Noss adapter. Thanks

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