I�ve been going through the archives for the last hour and
am summarizing my findings here.

Bosch�s old numbering system uses a combination of letters
and numbers which designate the physical characteristics of
the plug.  Their new system is a four digit number.

The Bosch OEM plug that came with the engine is called
the Bosch �Super� plug.  Its number is W7CC0 or 7598.  Lots
of people like this plug.  It is cross referenced as
an NGK B6ES.

The cheaper version of the OEM plug is the Bosch W7CC.
There was a suggestion in the archives that they don�t last
as long as the W7CC0.  I was not able to determine the
difference between the two types.  Its NGK cross reference
number is also B6ES.

A couple of people vociferously recommend the Tri-electrode
Bosch plug with the part number W7DTC.  It was OEM on �85
WBXs and is used in numerous other automotive applications
as well.  It is cross referenced to NGK BP6ET.

A couple of people also recommend the Platinum plug, which
is more expensive than the OEM one.  Its Bosch number is
4233.

There is no four electrode �Platinum +4� plug recommended
for the 2.1L WBX.

Other manufacturers apart from Bosch and NGK offer similar
ranges of options.

Spark up happily!

--tabe johnson
xtabe@yahoo.com
'87 Westy

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