Re: WM-15 carb filters? '86 50 hsp.
Yeah, definately replace those floats and the needles and seats. In fact when you get the floats they will come with new needles and seats. There is a little note in the package that states you must replace them both. I had no end of problems with mine until I changed them.
Be careful pulling the pins out that hold the float in place, they do not come with the new float kit. Neither do any of the gaskets. The small copper washer goes into the seat. I didn't realize there was a washer in there already and put the new one in, then couldn't figure out why the seat sat so high. The old washer is a pain in the backside to get out too.
Ian