1997 Yamaha blaster it bogs when you try to start out with but when it get going if you keep the rpms up it run like a champ you put a rebuilt carb on it and the same thing it wont idle?

It sounds like you may have a vacuum leak. Here's how you test it... you will need to remove the air intake line to the carb, and place a CLEAN piece of cardboard over the air inlet port. If the ATV keeps running, you have an intake leak if it dies, then I would guess your pilot jet in your carb is clogged. If you used the same jets in your rebuilt carb, you will have to take it aparat (again.. I know) and run a small guitar string through the pilot jet hole. Based on your symptom I would guess it's the pilot jet being clogged, but the vacuum leak test is so easy I would try that first. Hope this helps!