Quote Originally Posted by bato87 View Post
They have N6B,I don't now is N6B similar with N6WB,I think they are similar.I found manual for N6WB.

Can you send me manual for FM160L-M?My email is batop87@gmail.com.

Thanks
Bato87,
Main difference is valve springs & plate,

- WB use heavier springs which are not interchangeable, as won't clip into valve plate.
- water cooled heads on "B" have water jacket cast into head.
- Shaft seal is single type in "B" & double "WB", but interchangeable.

That"s about it.