just 2 weeks ago I bought a motorcycle from private! has had some scratchers on the clutch lid. today I see the frame also what has come. in the purchase contract there is nothing in it salesman has also made no information that the frame is warped or otherwise, in the contract there is only scratchers on the clutch lid. must he take back the motorcycle or can I first get an opinion that the seller then has to pay? how do I best go ahead? thank you Sebas Tian