Bone Stock Exhaust Glow

So I have a bone stock 2005 rmz 250, I just went thru the carburetor and returned everything back to stock after expirementing with an oxygenated race gas and replaced the sparkplug (.030 gap) and air filter. The exhaust now glows noticibly red (in the light) after 30 seconds or so of idling. Is this the stock behavior or is something wrong?

Also if I touch the throttle at all the idle will jump way up for 4-5 seconds and then returns to normal. No idea whats causing this.

Im currently running 93 octane 300ft above sea level and its 73 degrees out.

The exhaust glow is normal, I have an 06 that does the same thing and it is in great running condition. Not sure about the other problem tho.

check for a vacuum leak

Also, it sounds dumb, but I just did this. I had the carb out to put a new pilot jet in and had just stuck the carb back in the boots without tightening the clamps. Yup, massive vacuum leak and it wouldn't idle down and the revs would hang really high plus the glowing header pipe.

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