Burning Knees

I have been excersizing since March and have lost 60 lbs. I have been doing mostly treadmill walking and running. The problem is everytime I try using a bike, my knees will burn after a few minutes. Is there anything that will help me prevent this burning?
 
get that checked out

my left knee was burning for a while then one day my knee gave out and buckled and bent the wrong way and i tore a ligament and dislocated my knee. get it checked out, i thnk u've got a torn ligament.
 
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