NGK (6289) CR9EIA-9 Laser Iridium Spark Plug, Single Pack Review

Took for snowmobile Yamaha Apex RX10ST2 in the amount of 4 pcs. After replacement, the engine starts much better, although the old nickel ones are still quite alive

Great spark plugs! The Versys repair manual says to change every 12,000 miles. I was able to put on 18,000 miles before the change and judging by the looks I probably don't need it.

The Revain Garage feature says this spark plug is not compatible with a 2014 Ninja 650 but I installed it and it works fine. Also referred to as #NGK in the service manual for the 650 model.

These spark plugs break badly on Vulcans. I found that according to the service manual I had to replace them every 7,000 miles. Given that they last as long as the service interval requires, I think this is enough.

No better connector than Iridium, I said. I use them in my cars and have replaced the OEM copper plugs on my bike with them. My stock spark plugs weren't worn out, but at 4,000 miles the gap check was the factory service interval, so I just replaced them.

fantastic thing! The distance was even adjusted to specification! Thanks to these bad guys, my bike runs a little smoother now. Definitely worth the extra money compared to other cheaper brands. Only the best should be in your bike and these spark plugs really are among the best!

I think I've noticed a difference with these new spark plugs. I had 29 grand for original spark plugs from my 2012 Kawasaki Concours. The fragmentary part of replacing plugs, in stores it takes 3 hours to change them. I stopped changing spark plugs when the manual said "remove subframe bracket".

As far as I know NGK is the leader in the line. I think Iridium is at the top of that list. The price was very good, especially with free shipping. This part is great! The only thing is that after about 3 hours of operation of this candle, a crack or defect formed in the central ceramic insulator, as a result of which the spark disappeared. Ran a few days to find better than new. But then it started to misfire and was hard to start (500cc utv); If the spark plug was removed and pressed against…