This notice does not apply to: CAUTION !! Honda CBR1100 XX Year 01-02 to Fg.-Nr.3405929 IMR9A-9H from Fg.Nr.3405930 IMR9C-9H. Because: 1. The NGK - Page says: Basically, from 2001 model is the NGK IMR9C-9H to use. 2. What is the difference between the IMR9A-9H and the IMR9C-9H? Only the ground electrode of IMR9C-9H is conical. This is the concentration of Spark. The ground electrode of IMR9A-9H, however, has a conventional shape. All other values are absolutely identical. This information comes from a customer inquiry to NGK USA (1) and customer service (2): Here the ORIGINAL response from NGK USA (1): Thank you for Contacting NGK sparkplugs USA. Fortunately the IMR9A-9H Can Be Substituted Hanes IMR9C-9H without any issues. The only difference is the IMR9C-9H has a taper cut ground electrode Which helps to concentrate the spark morethan on the IMR9A-9H. I would recommend you continue using the IMR9A-9H, but When replacing the plugs again You may want to get the correct IMR9C-9H Because They may give slightly better performance. Hope this helps, thank you. End of the original response from NGK USA. ORIGINAL - answer the customer service (2): Hello Mike, These Are The Same plug Essentially, the only difference Is that the IMR9C-9H features a tapered cut ground electrode shape. All other characteristics, heat range, and CAP are the same. The IMR9A-9H plug you purchased should work fine, Although the tapered cut is to reduce quenching and shadowing. END of the response of the Customer.
My CBR1100XX Model 2001 had the IMR9A-9H it. With the IMR9C-9H engine power increased noticeably. The start behavior is now even better.
So the information is the NGK - page provides absolutely right and justified. I hope you could so the unsettled CBR1100XX - Bestizern help on this issue. Because this notice from time to VIN has enormously me insecure .....
