You shouldn't think that it needs repaired!it's going to cost you,get in touch with the seller and explain that since you got it home it isn't working properly,the smell maybe burning rubber,is it sitting nice and level on the floor?CONTACT seller FIRST be nice explain that it seems wrong,he or she may be able to help you.If they don't then you could take legal action,the goods have to be fit for what they were intended,private sale or not.
Rich, October 2008