SOHC.co.uk Forums > CB350/400
Spark Plugs!
Matt_Harrington:
Does someone know the equivalent Denso plug to replace NGK ones on my 400/4?
I spent hours last weekend chasing a fault only to find it was my complete set of plugs that were faulty. They worked initially on the new engine build and all was good apart from fuel leaks. This led me to believe that the ignition system was OK (How wrong I was!) Carbs sorted and installed and no firing at all. As The carbs had been off I assumed the issue was there.
Anyway, on a whim I replaced the plugs with an old set and the engine purred like a kitten.
I have yet to establish if the plugs are fake but with so many fake ones around, as I have discovered, I thought Denso ones might be an option.
McCabe-Thiele (Ted):
Looks like these:-
https://www.sparkplugs.co.uk/motorcycle/spark-plugs/motorcycle/champion-denso-beru/honda/405/cb-400-four-37hp-27kw/1975-1978/10750_420061
Looks like only Resistor type at sensible price end!
Matt_Harrington:
Thanks Ted,
Didn't know of that company. There is also a W24EP-U but that has a solid SAE connector.
Laverda Dave:
According to the Denso site the plugs you need are Denso-X22ES-U 4. I ordered a set from the Green Spark Plug Company on 24th April and I'm still waiting for them! I have chased them up twice now, the first time the response was they are waiting for Denso to send one plug to complete the order and second time I received no reply at all. Pretty shoddy service really and I wouldn't recommend them.
Matt_Harrington:
Dave, I seem to get differing results:
https://www.denso.com/cgi-bin/global/plug/cross_ref/list.cgi?m=0&p=0
Or am I misreading it?
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