Hello,
I bought a set of spark plugs from this website:
http://www.aliexpress.com/item/New-spark-plug-OEM-IZFR6K11-9807B-5617W-NGK-6994-9807B5617W/32458226581.html?spm=2114.031010208.3.2.itS5U9&ws_ab_test=searchweb201556_6_71_72_73_74_75,searchweb201527_5,searchweb201560_9
I have used them for about 60 miles and they turned up to be fake.
As advised by my coleagues from Hondafan website i have checked the spark plugs and all were presenting severe burning marks at the base.