Honda-SOHC

This is from a copy of the CB400 Owners Manual that I downloaded some time ago.

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That is really strange about the Green Sparkplug Company. We have used them regularly for NGK and Denso plugs and always had excellent service. Graham said they were having some supply issues but that was ages ago. Have you tried phoning them?

I use both Denso X22ES-U and X24ES-U plugs in my 750F1 the last set I got from Sparkplugs Limited and had no problem with them.

Cheers

Dennis

I think you are right Matt. I went onto the GSPC website and typed in my NGK plug code and that was the answer I got for the ND plugs I need. I have just gone onto the Spark Plug Ltd site and it is showing the same plug as you state, something strange going on!
I have now placed the order with the Spark Plug Ltd and given up with the Green Spark Plug Company after waiting nearly FIVE weeks for my order. I have contacted them twice to chase up the order and didn't even receive a response the second time. Terrible customer service so have asked for my money back and left them an appropriate review to reflect my frustration in dealing with them. How can a company show items as being in stock with a two day delivery at the point of order when clearly they don't have stock and are waiting on a delivery from the manufacturer! If they didn't have the stock they should have offered an alternative plug from another manufacturer instead of the radio silence!