Piston rings

[thepom]

Ok Next question,got the piston ring set from yamaha and there are 2 piston rings and the oil scraper.The 2 rings have a different profile,one is square section and the other has a small curve...question is which one goes to the top? I think the square section one goes tot he top and the curved one in the middle......can any one help to confirm this?......the rings go with the numbers go to the top so I know which way up they go but cant find anything in the service manual about the ring profiles

[Motu]

The top ring will be chrome plated so should be more shiny,and will have a rounded profile.There have been engines with a cast iron top ring and chrome second for a quick run in,but chrome top is normal.

[thepom]

Cheers motu, I put a question on the hubb website and it says I should put the tapered ring at the top and the square profiled one in the middle so thanks for your help..... I would have put them the other way round ......