Thanks star tech.
I had found others that that were listed as 25x18 but had different parts number. I don't know if the 25x18 is mm? I'll get the right one and couple spares for the future. No messing with the timing that way.
Thanks again. edgey
Need key number 13331 357 000 for 1984 Honda g300. price is wide between 4 to 35 dollars for these. In parts diagram after specific item number it is listed as 25x18 also. Are all keys 25x18 the same or do I have to get exact item?