Maybe you should have sent the carby away to have the body bored and the slide sleeved.
Probably wouldn't have cost much more than a new slide.
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It cost me $30 for the slide, I doubt I’d get much done for that
Carb is reassembled and back on the bike. Started second kick after a good tickle. Idle was high so screwed the idle screw out to settle it. Took it for a ride and once warmed up it pulls well. Certainly a marked difference with the correct 290
main jet and the 3 1/2 cutaway slide.