Denso Spark Plug Iridium Long-Life - 5628

I bought it to replace the original plug in my 2005 street legal Honda XR650R. I've used the bike all these years regularly to go to work and go off roading on the weekends and the original spark plug still works flawlessly. I only bought it because I removed it last month and it had a lot of brownish crud built up everywhere except on the iridium tip and the inside of the platinum electrode. I put this new one and to be honest, I can't tell the difference between this new plug and the same plug that was in there since 2005. I saved the old plug and threw it in my riding bag as a backup in case this new plug fails in the woods but I doubt that will ever happen. Because of this, I believe these plugs are the best you can get. There's a reason why Honda uses them on many of their ATVs and motorcycles. Hondas are known for their reliability and that's why this plug came stock on my XR650R.

Fits right in the hole, tightens down easy, and sparks out the end very well!! Didn't have to return any of them. Great plug.

Have only had them installed for a short time but boy did they make a difference! If they last and perform as they have so far I will be a loyal customer. Put them in a Honda VTX1800T.

This is exactly what I needed to make my Rincon run like new

This is the factory replacement for my Honda Rincon ATV. It works and performs great in this ATV and see no point in trying another brand.