ditto on the freezer unless they get stretched too much.sometimes putting them in the freezer is enought to get them to contract so they fit otherwise you can use a little bit of grease to hold the O-ring in place. Just put a little bit of grease on the bottom of the O-ring and place it into the grove on the cylinder.[/b]
Your on the money! Your stock orings are viton (high temp) regular orings (typically black) are buna rubber (NOT high temp). Viton does not have the same "memory characteristics" as buna, therefore they don't return to original size as fast, freezer is a great idea. The buna would work for a little while then become compression set with the heat and leak. Good luck!I believe the o rings used are a viton material. Regular o rings are made of a different material.[/b]
its orange cuz its a high temp oring you cant use a hardware store one .What size is it/ i raced yamaha yzs for a long time and i have a pile of new ones in a drawer i have been meaning to clean out if you send me the size ill send you any that i have , id like to see them used there new and it would be a shame to throw them out when someone could use them, im sure i could send them in and envelope ill even give you the stamp[/b]