675 sputters past 1/2 to 3/4 throttle

Kidkawie

Forum Newbie
New to me splitter with a repower. Runs good up to 1/2 throttle then sputters past that. Plug was a bit dark, bowl and jet are clean. Any carb with adjustments I can swap? or try the high elevation main jet?

126M02-1006-F1​

 
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