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Author Topic: SB 334T 336 338XPT 339 357 335 XPT California 338 XPT California Auto decomp valve  (Read 279 times)

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Offline Cut4fun

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SB 334T 336 338XPT 339 357 335 XPT California 338 XPT California Auto decomp valve
« on: September 05, 2016, 01:50:28 pm »
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.

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Offline Eccentric

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Re: SB 334T 336 338XPT 339 357 335 XPT California 338 XPT California Auto decomp valve
« Reply #1 on: December 12, 2016, 02:46:29 pm »
Good info there.  When I get around to rebuilding my 335XPT California it'll have a plug in place of the decomp valve, and the port in the cylinder for the valve trigger signal will be blocked off however.
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For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.
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Offline SawTroll

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Re: SB 334T 336 338XPT 339 357 335 XPT California 338 XPT California Auto decomp valve
« Reply #2 on: December 26, 2016, 05:32:01 pm »
Quote from: Cut4fun on September 05, 2016, 01:50:28 pm
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.



....and the parts needed to delete the auto decomp (which should be done) are listed here, in frame "J":
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