hi, im looking at a 92 accord, manual transmission, but 1st 3rd and 5th gears
 

dont work. Anyone have a reason?

the transmission is messed up.

Changing the tranmission fluid can help a little if the gears are jammed; other wise you might have to change the entire tranmisson. Which is about 500-800 bucks depending on the year and all. Hope this helps