SB, 334 T, 336, 338 XPT, 339 XP, 357 XP,
335 XPT California, 338 XPT California,
Autodecompression valve, 2004-01
There are two different types of decompression valve. The difference between them is in the spring
pressure.
Models 357XP, 335XPT California and 338XPT California have a valve with a high spring pressure
(1.8N) marked with a B or AB, see diagram below. The part number that will be used is 537 12 68-03.
Models 334T, 336, 338XPT and 339XP have a valve with a low spring pressure (0.9N) marked with
an A. The part number that will be used is 537 12 68-04.