Bosch Plugs are tops in any application you use them for... All of their parts are worth what you pay for them...I've...\"NEVER\" had a Bosch part of any kind to fail at its applied usage...! True top of the line German Engineering... period...!!!!!!
I went with NGK. Been great so far (been about 2k miles).
I used Bosch plugs in mine about 3 months ago and I couldn't be happier.
I replaced my own plugs. I got NGKs as I really like their quality.
I run NGK Iridium in my truck, they were like $17 each. That’s just my personal preference, I’m a boat mechanic and we put NGK in everything never had many issues with them except for these newer outboards running a weird plug that seem to foul after a couple hundred hours. I replace the plugs in my truck at like 250,000 miles. I currently have 370,000 on the truck and haven’t changed the plugs yet.
As an ASE honda mechanic stick to OEM Only which will be NGK lazer Iridum or Denzo Iridum plugs. Cheap plugs foul and cause wear and tear on ignition coils and other electronics. As well but not limited to possible system lean codes and fouled injector tips.
Pulled the plugs and the center electrode is rounded off pretty bad. Gap is more than twice as much as spec. After replacing the plugs with OE NGK the bike is back to purring like a kitten so it was the plugs for sure.
Here’s a link that may be of help. Your plugs are quite fouled and even at end of life plugs should not look like that.
I ended up checking the ignition timing again, put in a new coil, new knock sensors, put in another fresh set of plugs, set the DPR MA to +5, and I failed my emissions test with the same results.
I did buy 3 set ngk iridium from ebay for several vehicles and they are all fake . it misfire and destroy coil too...as soon as took the out the tip of the plugs worn out to the bone...
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