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tuning help: 7k rpm stumbleZ

Cross posted from the polaris section because I'm supposed to go on a big trip tomorrow...

I am at wits end with my machine. It just won't run right. I need help. Its an 07 RMK 600, carbed.

It has, new top end, new clutch springs, new carb boots, new plugs, jetting is dialed, slp pipe and can, blah blah, it is perfect. Except:

I can run the machine up to about 7k rpm if I ease into the throttle, but any time Lay into it (to the bar) the machine will just fall on its face and stumble at about 5500 rpm an. It won't clean up no matter how long I stay there. It works great up to about 3/4 throttle, then once I get much beyond that it starts stumbing (sounds real confused, almost like a cross between running on one cylinder, and hitting a rev limiter)

I've checked everything. I'm going to recheck power valves tonight, but those were fine. Plugs are cardboard brown, a bit rich at idle. Just reset the tps to spec. I didn't see a tear in the bellows either.

I'm at a total loss.

Thanks
 
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