NGK LMAR8A-9 vs -9S

[bflint]

Noticed that mechanics have historically used NGK LMAR8A-9 spark plugs on my 2014 CB1100DX. Noticed that the spec says to use NGK LMAR8A-9S for Honda's. Asked ngk.com (aka sparkplugs.com) vendor about this ... their answer: "The only difference is the the "S" on part number 6817 LMAR8A-9S stands for special gasket. Usually the means the gasket is made of stainless steel. The NGK-4313 LMAR8A-9 plugs just have the standard plated steel gasket." FYI, the two models are both $6.54ea from this vendor. Anyway, I bought the 9S model.

So you have been running the non S plugs in your dlx without issue?

BTW here's an interesting thread about the plugs and post 79 by Max may very well explain the purpose of the special washer

http://cb1100forum.com/forum/showthread....park+plugs

All my service invoices show the non-S plug part number. This is the first time I looked at the installed plugs ... so can only testify that last dealer (my fav MotoWorld .. not) installed non-S plugs. Seemed to run ok. Just one more reason though to do my own work here in San Diego. I have always told the service dept's that I am not concerned about costs ... I just want it done correctly and to use OEM stuff ... these NGK plugs are the first non-OEM mech stuff I have knowingly purchased based on current lead times to get the Honda OEM plugs. OBW .. could not find the Max post in the link you posted.