Radian revs really high and shoots gas out of airbox

Check your owners on the amount that engine requires. 64 oz seems to be high.

could beTPS sensor[RPM] maybe need to be replace.is in throttle body[gas line]

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Sounds like the idle control valve. The same thing happened to my Mustang and that was my problem.

Trouble shoot it by removing the airbox cover and air filter; squirt a shot of carb cleaner down the throat of the carb, with the choke open and everything in the run position try and start.
If it tries to start or starts and runs for a second that rules out an ignition problem and points toward a fuel issue.

First u need to trouble shoot to find the source.check to see if it has spark,gas and air. And copression ....a engine works like this , suck pop blow....

Your Radian has 4 Mikuni carbs. If just one has a stuck float or one set incorrectly it will overflow with gas and run out. The bike will run poorly if at all. You need to pull all the carbs and clean them thoroughly. Check you r fuel line too for leaks and cracks. Make sure your air filter is clean and the boot going to the carbs from the airbox. Check the boots on both sides of the carbs for cracks. Air leaks can cause the idle issues you describe but you have to fix the overflowing carbs first which might fix all of it. Make sure you have a nice large work area, don't lose the small jets or strip the bolts. This answer is directly for your issue you have presented. Good luck!

usually when the needle and seat are stuck, the gas will run out of an overflow on the side of the carb, unless those are plugged for some reason, then obviously the gas will flow where ever it can. is the machine 2 or 4 stroke?,

can be a mass air flow, idle air flow ,or even a hole in the tube between the airbox and the throttlebody........any air leak will cause this to happen.make sure you have no vaccuume lines off either

yea sounds like you have a stive set for natural gas hooked up to propane gasm you need to convert that thing instructions are simple to follow in installation manual, or if you paid someone for installation id get them back