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Re: Where can I buy parts

Rings are Mercury pare # 39-21665
New piston scarce and $$$ A good used piston will work
Upper crankcase seal 7415 (industry code)
Whether you do a little or a lot you will need gaskets and gasket sealer

There are several sources for used parts
Fergusson Poole has gaskets and probably rings
Water pump has a seal and impeller which are likely to be iffy at best.
I believe there is a printable copy of WD4 parts manual which will give
you a good idea of WF4 and WG4
Good Luck
Keep us posted on progress and problems.
Louis

Re: Where can I buy parts

WG4 shares many parts with Mercury KD4
https://www.oldmercs.com/category_s/85.htm

Re: Where can I buy parts

You can buy parts here: