I bought one new YS, the .53 when it was first introduced. I researched the web and got tons of information, yet it never ran reliably. Performance Specialties recommended an upgrade kit to add an airbleed screw. This was $35 and didn't help much. I ran YS 20/20 and so forth. YS loyalist who couldn't do anything with it, said, "Oh, it's only the .53, the others run great!" I ended up giving it away only to laugh every time the new owner thought he "had it right", only to deadstick at an inopportune time.

Sucker me once.....