When he said he had stamped the book the thought never even entered my mind because he had actually serviced it and not just stamped it, wasn't out to deceive any one, the guy I sold it to knew it had been serviced as he could see the new fuel filter and othe Bits had been done and as I say the thought never entered my mind as I had it in the day before I sold it to have some warranty work done on it my self and nothing was said.