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XR277R Jetting

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Hi Guys, I recently overboard a 1986 XR250R to 277cc with a 77mm Weisco kit.

It has an uncorked aftermarket exhaust, and I have a uni filter without the baffle. Any idea on what the jetting should be? Pilot/Main/needle clip position?

Thanks and Happy New Years!

Ben

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my throttle response seems great, i know others have issues with it but mine seems to be great. Im using 142/45 and fuel screw is at 2 turns i believe. exhaust baffle removed, snorkle gone, port and polish, header welds ground. elevation is 300-1500ft

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Do you have to sleeve the cylinder to go to 77mm or just bore the original sleeve?

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Do you have to sleeve the cylinder to go to 77mm or just bore the original sleeve?

No sleeving needed, just bore and hone.

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