Have you tried your nearest Yam dealer, they should have most bike details on micro-fiche and will I.D. parts on-screen for you. Can't say that i've come across a ph either! PW/YFM maybe, otherwise try yambits.com or motoward.co.uk
2 stroke Ted, May 2010
To be honest i have never heard of a ph 80?are you sure its not a pw 80 which is a small 80cc yamaha field bike.