Idles fine at a start but after i ride it, or give it a good rev it idles high and refuses to drob below 3500 - 4500rpm until i shut the bike down then the same issue

SOURCE: 1991 CR 500 (reving to high on idle high serges)

take some wd 40 & spray around the carb boot while running to see if the idle drops for a few seconds. sounds like you have an intake side air leak causing a lean condition making the motor rev high.

SOURCE: bike idles, but with a little throttle it jumps to high rev and wont come back down to idle

You need to oil your cables first....They make a gadget to help you do this...it clamps around the end of the cable, and you spray oil into a provided hole for a spray nozzle tube...Then see if the cables are unstuck by turning the throttle grip back and forth for awhile....start it and see if that helped....if not you may need to replace the cable(s)...I doubt that the slide in the carb is hanging up...or valve.If this doesn't work notify me.

SOURCE: Bike is sputtering in high 2nd/3rd gear, best kind in idle

Sounds like a lean condition. Spark plug should be a tan brown.
I would say the carb probably wasn't drained prior to storage and your main jet is gummed up. Gas deteriorates very quickly especially in vented containers like the float bowl of a carb.
clean your carb for sure.

Ned C Cook

• 3433 Answers
• Posted on Jun 13, 2009

SOURCE: 2003 xr80 dirt bike, idle is super high

Yrs, carb needs cleaning

SOURCE: high idle when the bikes hot.

You either need to clean and adjust the carbs on it, or you have a vacuum leak somewhere.