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103 Posts
anyone know if ngk makes a plug for this engine and if so whats the part number?
spark plug
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The standard plug is CPR6EA-9, but if you plan on doing a lot of sustained, high-speed riding, Honda suggests you switch to the CPR7EA-9.
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103 Posts
k thx, i was dissappointed when i took the plug out and it said "denso"
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261 Posts
A 7 is a colder plug then the 6. You should've been running richer not leaner. Hence why its recommended for high speed runs,
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648 Posts
My 7 plug is working fine. I changed from the 6 to the 7 since most of my riding is wot. I try not to let it idle for more than a minute before setting out is all. I haven't checked the plug though. When I took out the 6 plug after a couple hundred miles, it was a little white but was working fine.
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451 Posts
BE SURE TO USE ANTI-SEIZE GREASE ON YOUR PLUG!!! If you don't and the plug gets too hot the threads will seize. A very bad thing. The heat range on a plug relates to it's ability to dissipate combustion heat. It has nothing to do with mixture. The reason Honda recommends a 7 range for extended high speeds is it can handle the higher temps better. It has nothing to do with the spark.
Then there is the projected tip vs standard. For extended WOT a colder standard tip might be better, slightly less power maybe, but lower tip temps. I am trying out an NGK-CR7E,
it is the plug used in my Yamaha Vino 125, (a standard tip) 7 heat range. With NGK a higher number is colder. Too hot a plug can cause pre-ignition (bad), too cold can't hurt anything. Bigger bore, more compression, more cam, more combustion heat. So, you go to a colder plug.
If you go to a from 6 to 7, the plug will be darker (lower operating temp), the mixture (AFR) has not changed.
As a rule projected tips are for high performance engines, standard tips for extended loads, like marine engines , scooters (CVT), towing vehicles and hot climates (Texas).
Then there is the projected tip vs standard. For extended WOT a colder standard tip might be better, slightly less power maybe, but lower tip temps. I am trying out an NGK-CR7E,
it is the plug used in my Yamaha Vino 125, (a standard tip) 7 heat range. With NGK a higher number is colder. Too hot a plug can cause pre-ignition (bad), too cold can't hurt anything. Bigger bore, more compression, more cam, more combustion heat. So, you go to a colder plug.
If you go to a from 6 to 7, the plug will be darker (lower operating temp), the mixture (AFR) has not changed.
As a rule projected tips are for high performance engines, standard tips for extended loads, like marine engines , scooters (CVT), towing vehicles and hot climates (Texas).
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680 Posts
Rule of thumb when using anti-seize compound -- always torque to the low end of the torque range to avoid stripping the threads.
Sent from Docking Bay 327
Sent from Docking Bay 327
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451 Posts
I confirmed this today, from a guy that has been building racing engines for more than 35 years. He showed me his last build a 150cc double cam 4v desmo capable of 16000 rpm.
So he says running a NGK CR7E for extended high load (60mph cruising), is not a bad idea. This is a 1 step colder standard tip plug.
So he says running a NGK CR7E for extended high load (60mph cruising), is not a bad idea. This is a 1 step colder standard tip plug.
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163 Posts
Just an FYI, while NGK doesn't explicitly state not to use anti seize - it does caution it's use.
From their site #1:
http://www.ngksparkplugs.com/pdf/DYK_5Points.pdf
From their site #1:
http://www.ngksparkplugs.com/pdf/DYK_5Points.pdf
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54 Posts
for sustained High speed riding Honda recommends alternative plug ...
NGK CPR7EA-9 also called NGK 3901 ..
the one that came on my 2014 stock is CPR6EA-9
{weak/puny performance from this stock plug}
I just threaded in the Honda Recommended NGK CPR7EA-9 3901....
Original stock plug with 122 total miles since bike was new 'CPR6EA-9' plug was burnt carbon black
FYI I think Ducati takes same NGK 3901 plug.
![Spark plug Auto part Automotive ignition part Automotive engine part]()
OLD plug NGK CPR6EA-9 with 122 miles since bike was new ....
....next to new plug with Honda Recommended High speed plug empty box.
3901 plug in bike awaiting first start-up .
NGK CPR7EA-9 also called NGK 3901 ..
the one that came on my 2014 stock is CPR6EA-9
{weak/puny performance from this stock plug}
I just threaded in the Honda Recommended NGK CPR7EA-9 3901....
Original stock plug with 122 total miles since bike was new 'CPR6EA-9' plug was burnt carbon black
FYI I think Ducati takes same NGK 3901 plug.
OLD plug NGK CPR6EA-9 with 122 miles since bike was new ....
....next to new plug with Honda Recommended High speed plug empty box.
3901 plug in bike awaiting first start-up .
Attachments
You lost me. From the picture you posted it appears that your stock plug has some "dry fouling". "Dry fouling" can be a condition of a "cold plug". You installed a plug that is even colder than the stock plug. The number on the plug doesn't suggest you will get any additional performance from it. The number only indicates the ability of the plug to resist heat. So I can see running a colder plug if you had burned up your stock plug, but a burnt plug isn't black.
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