The CB1100 Community Forum

Found these plugs- made by NGK and appear to only be sold in Japan.

Just ordered a set.

The pictures- although I only read english- appear to show claimed fuel access to the spark area- and increase in flame propagation once lit.

It also appears they show increased fuel economy and power output.

I'll leave it to others to test MPG- but I will be able to test power on my dyno.


Stock plug-







Performance plug-





















NOTE- that they *look* very similar to these, other than the solid non removable terminal below- but if you look close- these still have the square style as opposed to the D shape-


https://www.ngk.com/ngk-90992-silmar8a9s...spark-plug

i put those in mine a while back didnt notice any diff put them on the dyno lets see what they do !!!
ngk is my go to even in my big chevy engines i run like my 489 in my camaro

https://www.youtube.com/watch?v=THvbfTKEN_M

(03-18-2023, 07:37 AM)1973cb750_imp Wrote: [ -> ]i put those in mine a while back didnt notice any diff put them on the dyno lets see what they do !!!
ngk is my go to even in my big chevy engines i run like my 489 in my camaro

You won't notice a couple hp seat of pants.

Most people wouldn't notice 5 hp or tq if you blindfolded them between identical bikes...or 10-15 hp or more between identical cars.

But put a louder muffler on- and and even if it LOSES power they will think it is faster.

And making power the old fashioned way- true hot rodding- is all about small steps adding up.

Turbos killed hot rodding.

Waaaay too easy to go fast on modern cars without having any idea whatsoever on how an engine works.

(03-18-2023, 07:43 AM)PowerDubs_imp Wrote: [ -> ]https://www.youtube.com/watch?v=THvbfTKEN_M

(03-18-2023, 07:37 AM)1973cb750_imp Wrote: [ -> ]i put those in mine a while back didnt notice any diff put them on the dyno lets see what they do !!!
ngk is my go to even in my big chevy engines i run like my 489 in my camaro

You won't notice a couple hp seat of pants.

Most people wouldn't notice 5 hp or tq if you blindfolded them between identical bikes...or 10-15 hp or more between identical cars.

But put a louder muffler on- and and even if it LOSES power they will think it is faster.

And making power the old fashioned way- true hot rodding- is all about small steps adding up.

Turbos killed hot rodding.

Waaaay too easy to go fast on modern cars without having any idea whatsoever on how an engine works.

You won't notice a couple hp seat of pants.

Most people wouldn't notice 5 hp or tq if you blindfolded them between identical bikes...or 10-15 hp or more between identical cars.

But put a louder muffler on- and and even if it LOSES power they will think it is faster.

And making power the old fashioned way- true hot rodding- is all about small steps adding up.

Turbos killed hot rodding.

Waaaay too easy to go fast on modern cars without having any idea whatsoever on how an engine works.
yeah lets see the gain or loss with similar oil temp and conditions

Found a video of a guy that shows the actual spark difference between the plugs....and then dynos the difference.

It's a single plug...and a small scooter... but the spark pattern looks MUCH more consistent to the naked eye- and he gains 1.7% power...on a relatively low reving, very low powered single cyl.

https://www.facebook.com/watch/?v=1098692313927723

I would LOVE 1.7% gain from an easy cheap plug change.

104 to almost 106 (WHEEL)- not advertised crank.

I dare say that the higher the revs- and more cyls.. the better these should work.
https://www.youtube.com/watch?v=KHM16Gemc0w

(03-18-2023, 07:22 AM)PowerDubs_imp Wrote: [ -> ]Found these plugs- made by NGK and appear to only be sold in Japan.

Just ordered a set.

The pictures- although I only read english- appear to show claimed fuel access to the spark area- and increase in flame propagation once lit.

It also appears they show increased fuel economy and power output.

I'll leave it to others to test MPG- but I will be able to test power on my dyno.


Stock plug-







Performance plug-





















NOTE- that they *look* very similar to these, other than the solid non removable terminal below- but if you look close- these still have the square style as opposed to the D shape-


https://www.ngk.com/ngk-90992-silmar8a9s...spark-plug

The "marketing" format kinda reminds of years long ago when one chromium cassette tape manufacturer would butt heads against another chromium tape how their product produced 0.5 dB more headroom with 0.8% less distortion at a given input level and frequency across the audio spectrum.

Did they say what the 'normal' plug was? Was it iridium- or was it a plain plug?

Here is a video from NGK themselves- again in another language but you can use the CC function and then hit settings and pick translate to english.

Things get interesting around 22:30

https://www.youtube.com/watch?v=KHM16Gemc0w

At 36:03 they show 2.3% increased fuel economy for given test conditions.
Looking at that video- it appears these launched overseas for a scooter that luckily for us shares our same plug.

Here is another article-

"MotoDX, NGK's Latest Motorcycle Spark Plug Claimed to Boost Engine Performance"

https://www-liputan6-com.translate.goog/..._tr_pto=sc


and-


"NGK MotoDX Becomes the Official Spark Plug for Motorcycle Racing"


https://www-mobilinanews-com.translate.g..._tr_pto=sc



I'm not skeptical at all- because I've seen sparks move around on plugs even back in the '80's on dirtbikes from the 70's running off points.

And that's on new clean plugs... throw carbon / oil into the equation- much less air & fuel flow with compression...

So no surprise to me that a modern high voltage computer controlled ignition, combined with much better materials and machining- can use a much smaller plug area to develop a more consistent and accurate spark- along with a more open and accessible access to and travel from for fuel burn.

Get up to 9000 RPM or more...150 revs times a second...I'll take every missed spark...and better atomizing injectors if I can find them as well.

Much like how for well over a decade now the best sportbikes have had dual stage injectors- at high revs a set further away fires to give more time to mix with the air for better firing.

If you don't like his real world spark video comp- are you saying his dyno was BS as well?

NGK isn't some fly by night company... I'd assume they tested and can back up their charts...

(03-18-2023, 09:19 AM)GoldOxide_imp Wrote: [ -> ]

(03-18-2023, 07:22 AM)PowerDubs_imp Wrote: [ -> ]Found these plugs- made by NGK and appear to only be sold in Japan.

Just ordered a set.

The pictures- although I only read english- appear to show claimed fuel access to the spark area- and increase in flame propagation once lit.

It also appears they show increased fuel economy and power output.

I'll leave it to others to test MPG- but I will be able to test power on my dyno.


Stock plug-







Performance plug-





















NOTE- that they *look* very similar to these, other than the solid non removable terminal below- but if you look close- these still have the square style as opposed to the D shape-


https://www.ngk.com/ngk-90992-silmar8a9s...spark-plug

The "marketing" format kinda reminds of years long ago when one chromium cassette tape manufacturer would butt heads against another chromium tape how their product produced 0.5 dB more headroom with 0.8% less distortion at a given input level and frequency across the audio spectrum.

Agreed- and actually quite comparable- in both cases would be easily not noticed by the common man without test equipment- yet also easily able to be tested and proved.

Nobody said it is earth shattering... but a gain is a gain. Depends on how much it matters to each individual.

Dremeling out the stock velocity stacks will give a MUCH bigger gain in power output- for MUCH less money...but MUCH more work to do.

As far as cheap mods go- best is bore the TB stacks, but not quick and easy.

As far as easy HP goes- a slip on muffler- but not cheap.

These plugs- if they work- are more of a 'already have everything else' type thing- unless you are a guy like Ferret that does a LOT of miles.

Yea- the dyno will find out.

They weren't expensive either- got them on Amazon Japan.

I hear this spark plug "news" in auto business for a few decades.. and what I do is this: when plugs are due for replacement, I do replace them with current OEM, platinum or iridium tips, mostly NGK.
No new or exited "news" to me.

It is always easy to fallback to the OEM spark plugs because the design engineers and testers spent a lot of effort getting the default product to work with that selection.