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Water Warrior 2 · 09-22-2012, 07:27 PM

The GZ has a rocker arm set-up so it is easy to do a valve adjust. No shims and disassembly required. The GZ has a 4 valve head where as the S-40 is a 2 valve head if my memory cells are all firing. Don't worry about the chemical formulation of oil. Any oil that is recommended for a motorcycle should meet all requirements without messing up a catalytic converter. The GZ does not have a CAT so you are home free.

09-22-2012, 07:27 PM	#2
Water Warrior 2 Senior Member Join Date: Dec 2006 Location: Squamish B.C Canada Posts: 11,409	Re: Oil and ZDDP levels The GZ has a rocker arm set-up so it is easy to do a valve adjust. No shims and disassembly required. The GZ has a 4 valve head where as the S-40 is a 2 valve head if my memory cells are all firing. Don't worry about the chemical formulation of oil. Any oil that is recommended for a motorcycle should meet all requirements without messing up a catalytic converter. The GZ does not have a CAT so you are home free.
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