Well since I cant see anything other than a title post and nothing else, I'm just going to comment that you are probably too old to be riding an old school YZ490...just saying.
Hows your foot, or ankle, or leg BTW?
Not too old , right now , riding YZ 450 F . Happy to have de comp release , foot now better after time to heal , not kicking that dammed Kx 100 . Reclocked and straightened kick lever . Now easier to start , not hitting footpeg .. just found 490 , ...recieved call , come see if you want this bike , guy didn't know what he had . I identified it for him , tires and rims were new when parked , only needs air filter and cover front brake master cyl , clutch cable and lever , has great compression , needs cleaning , and probably new brake pads ....carb cleaning , owner wrecked it , then retired ....,