If they are the same that the CB500 uses they would be 1.25 mm in pitch x 10 mm dia. Japan uses 10mmX1.25 a lot in their machines,allthough lately I have seen other pitches. In 10mm dia. there is 1.25,1.5 1.75. In US made I see a lot of 10x1.5 sizes.
Generally ,a rig made in Japan would use 5X.90,6X1,8X1.25,10X1.25 ,12X1.25 and 1.5 etc. This varies some but in the years that I have worked on Japanese cars and so on this is what I have seen.