300/440/550 90' 650sx bogging when at temp

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i have a 90' 650 sx when i start it i run it for a min. to just to get it up in temp a little then go out and it runs perfect for about 5 to 10 mins. depending on how hard im riding. Seems like once its warmed up it bogs so i have to feather the throttle still idles and will rev out but i have to feather it. the motor doesnt sizzle so i dont think im overheating if anyone has any insite it would be greatly appreciated
 
Clean the carb. The problem probably doesn't have a whole lot to do with the temp of the engine, it shouldn't take 10 minutes to get warmed up. Try to narrow it down by working through one thing at a time. My ski used to do this because it was missing the valve that pressurized the fuel tank. Once I put one on, it was better but not great so I rebuilt the carb and it was gone after that.
 
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