SOHC.co.uk Forums > CB500/550

Correct spark plugs for my 500 ?

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McCabe-Thiele (Ted):
Parts manual shows NGK D-7ES or Denso X-22ES

The Denso seems to now have a U at the end now shows as Denso X-22ES-U

The NGK looks as though it is obsolete - I have resistor caps so don't want NGK DR-7ES.

Green Spark Plug Co shows the Denso X-22ES-U at good price.

Can't find my old spark plugs - I've been using some used NGK D8EA plugs to keep debris out.

Nurse Julie:
Denso X22ES-U is the correct type.

Johnwebley:
If you ride it, quite quickly, for a 70s bike

Mine runs great on the 24s



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deltarider:
In The Netherlands dealers advised the D8ES-L (or the ND equivalent). The "7" was considered the plug for break-in period only. This was advised because we used to ride at maintained high speeds. US riders usually have the 7. They prefer to ride at lower rpm's.

Bryanj:
IF you can find any D7EV are the muts nuts but expect to pay £8 ish EACH

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