1st mod on engine, spark plug heat range change NGK CPR7EA-9

CiscoSanJose · Jan 27, 2014

Decided to remove the STOCK supplied spark plug NGK CPR6EA-9 and replaced it with NGK CPR7EA-9. Since most of my riding is WOT at 50-65mph all day I wanted a plug that could handle the HEAT a little better.

I did notice that the new plug gave the Grom a little get up and go, not sure if it is because of the new plug or because the grom has under 300 miles on the ODM.

Riding that GROM like I stole it. WOT:big smile:

RaZed1 · Jan 27, 2014

Mine came with a Denso plug stock. I went with the cooler NGK as well though I can't say I noticed any difference in how it runs. I've had a lot of issues with Denso's fouling and causing odd running issues in the past.

Grom'n-BR · Jan 27, 2014

No offense but I think it's a joke that you think you notice the difference in the plug change.

I mean really...

BorjaQ · Jan 27, 2014

Unless the old plug was pretty fouled up.

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Mainjet2001 · Jan 27, 2014

As your mileage goes up when new, the speed will increase as the engine breaks in. My Grom has done that.

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yallknowme · Jan 27, 2014

If you don't think changing a spark plug makes a difference at times, then you have NOT changed enough plugs in your life.

BorjaQ · Jan 27, 2014

My engines run correctly, so I don't need to replace plugs more than maintenance requires...

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CiscoSanJose · Jan 27, 2014

Grom'n-BR said:
No offense but I think it's a joke that you think you notice the difference in the plug change.

I mean really...

or if you replace the stock pipes with a noisy one, or replace the 15T counter sprocket with a 14T:blackgrom:

spark plug heat range info
http://www.ngksparkplugs.com/tech_support/spark_plugs/p2.asp?mode=nml

Grom'n-BR · Jan 27, 2014

Hmmm not sure what your post is getting at......?
you linking me to spark plugs for what reason?

CiscoSanJose · Jan 27, 2014

Grom'n-BR said:
Hmmm not sure what your post is getting at......?
you linking me to spark plugs for what reason?

I figured the NGK info would help out other Grom or mc riders in case they wondered why spark plugs have various heat range for. Nothing like expanding your knowledge base.

Strokd_GE · Jan 27, 2014

RaZed1 said:
Mine came with a Denso plug stock. I went with the cooler NGK as well though I can't say I noticed any difference in how it runs. I've had a lot of issues with Denso's fouling and causing odd running issues in the past.

Really?? Where are you located? I thought they all came standard NGK

Grom'n-BR · Jan 27, 2014

Oh ok yea nothing wrong with learning. No one knows everything of course.
Id say you are more likely to notice fuel economy rather then even the most minute power from a spark plug on the grom. Bc these iridium plugs do run cooler obviously. Too bad o
don't see any for the grom from NGK

and Stroked, I thought all groms were ngk as well. I even think the grom manual claims they are ngk and to replace with that.

Mainjet2001 · Jan 28, 2014

Grom'n-BR said:
Oh ok yea nothing wrong with learning. No one knows everything of course.
Id say you are more likely to notice fuel economy rather then even the most minute power from a spark plug on the grom. Bc these iridium plugs do run cooler obviously. Too bad o
don't see any for the grom from NGK

and Stroked, I thought all groms were ngk as well. I even think the grom manual claims they are ngk and to replace with that.

Generally speaking, the grom's come with a Denso plug (U20EPR9/U22EPR9) however the NGK plug for the like Denso plugs are CPR6EA-9/ CPR7EA-9.
This is from the Service Manual. :cool2:

RaZed1 · Jan 28, 2014

Strokd_GE said:
Really?? Where are you located? I thought they all came standard NGK

Upstate NY. I don't remember the plug #, but in the owner manual it lists both NGK and Denso plug #'s, mine had the Denso one.

THE TECH · Jan 29, 2014

I think I'll pick one up today.

BiG Chris · Jan 29, 2014

Mine also came with the denso but I will be replacing it with a cooler ngk plug

MotardCrazy · Jan 29, 2014

Interesting to see it split between which plug people have. Mine came with an NGK.

THE TECH · Jan 30, 2014

Replaced mine today. Had the Denso in it.

MotoTG26 · Aug 1, 2015

after researching a ton on this subject i realized i needed to run a colder plug based on my riding style.

my setup on the grom is stock besides chimera cold air intake, shortened oem stock muffler with baffle cut out. removed the back tail fender, have the upgraded led lights. also removed those ugly stock mirrors..im running 110 octane turbo blue race fuel for the hell of it.

ok now to the spark plugs i came across after my research. they are Brisk performance, here is the link

Amazon.com: BRISK PERFORMANCE SPARK PLUG Replaces NGK CR9E - w/ 360-degree electrode SPMXAHZ200: Automotive

with stock spark plug on the same stretch of road and same set up i was struggling to hit 62mph, after changing to this spark plug, i just hit 67mph, same stretch of road same day, and i still had more. the idle and throttle response are almost unbelievable with this new plug. they cost 3 times as much as NGK iridiums but 100% worth the $18

also im 6'1" 175lb guy

i highly recommend them to anyone looking for new plugs, im not affiliated with this company whatsoever, i just never saw anything about these plugs on this forum, but i did on others and wanted to share with the fellow gromers

CiscoSanJose · Aug 1, 2015

MotoTG26 said:
after researching a ton on this subject i realized i needed to run a colder plug based on my riding style.

my setup on the grom is stock besides chimera cold air intake, shortened oem stock muffler with baffle cut out. removed the back tail fender, have the upgraded led lights. also removed those ugly stock mirrors..im running 110 octane turbo blue race fuel for the hell of it.

ok now to the spark plugs i came across after my research. they are Brisk performance, here is the link

Amazon.com: BRISK PERFORMANCE SPARK PLUG Replaces NGK CR9E - w/ 360-degree electrode SPMXAHZ200: Automotive

with stock spark plug on the same stretch of road and same set up i was struggling to hit 62mph, after changing to this spark plug, i just hit 67mph, same stretch of road same day, and i still had more. the idle and throttle response are almost unbelievable with this new plug. they cost 3 times as much as NGK iridiums but 100% worth the $18

also im 6'1" 175lb guy

i highly recommend them to anyone looking for new plugs, im not affiliated with this company whatsoever, i just never saw anything about these plugs on this forum, but i did on others and wanted to share with the fellow gromers

thanks for the tip, so you did try other NGK spark plugs such as the ones that I used and you did a back to back ride switching between the two types of spark plug.

for your second test try the NGK CR8EIX or the CR9EIX. I find that the CR9EIX works great in keeping my engine temp down and riding WOT.

The NGK CR9EIX cost about $10.55
The NGK CR8EIX cost about $11.99

For real comparison testing take your brisk performance spark plug and do a run down your favorite road after that run remove the Brisk plug and install a NGK CR9EIX and do the same ride on the same road on the same day as not to have changes in the air Temp and other conditions. You will be surprise to see how the NGK CR9EIX stacks up to the Brisk spark plug.

I just got back from a 29+ mile ride from San Jose to San Mateo today and the grom ran great with that plug plus going WOT the temp got as high as 230F at the stop lights and this is with a 170 BBK with no external oil cooler and our summer temp is around 75-80F.

1st mod on engine, spark plug heat range change NGK CPR7EA-9

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