SX/SXi/SXi Pro hot restart issue

Haven't got a lot of ride time on my rebuilt motor this year (5gallons) but I noticed it's developed a weird issue when restarting it hot. If I ride a few minutes and then let it sit for 10 minutes or so it will fire right up but runs very poor for about a minute. N/S are about 2 seasons old so I ordered a new set today. They aren't dribbling after its shut off cold but I didn't have a chance to check when the motor was hot. Anything else I should look for? All seals on the engine are new and it has a new head. It started doing this late last season. I tore the motor down just to inspect and reseal everything.
 
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