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hi
these engines where made in germany using metric its possibly better to use a metric cutting tool in this area.
i have heard that sorting this seat out can make quite a difference to your oil pressure john at aircooled even hires out a tool to do this for typ 1 motors dont know if its good for typ 4 mind mayby he can chip in if hes about and confirm?
how much more pressure is on this spring from pelican than stock?
be good.
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neil verdon 66 sqr on irs.
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