BPR5ES-11 vs BPR5ES spark plugs
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Joined: Aug 2008
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From: Lafayette, Louisiana
BPR5ES-11 is regular NGK plug.
BPR5EIX-11 is an iridium NGK plug.
Those are the two correct stock NGK plugs for an Evo.
I don't know what that other plug is.
Here is my source, right on NGK's website.
http://accessngk.com/part_finder/Motorcycles/step3.asp
BPR5EIX-11 is an iridium NGK plug.
Those are the two correct stock NGK plugs for an Evo.
I don't know what that other plug is.
Here is my source, right on NGK's website.
http://accessngk.com/part_finder/Motorcycles/step3.asp
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From: Lafayette, Louisiana
Personally, I always had a preference for Autolites in Harley's regardless if it was in an Evo Sportster or an Evo Big Twin.
According to Amazon, that spark plug fits Honda small engines.
https://www.amazon.com/Genuine-Honda.../dp/B00GL05DRS
Last edited by Prot; Sep 7, 2016 at 04:31 PM.
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From: SE Louisiana
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From: Poolville
The BPR5ES is actually a 10 heat range plug. On a stock Evo it will work very well....
It's one step colder than the 11 which is recommended for higher compression Evo's
It's one step colder than the 11 which is recommended for higher compression Evo's
Last edited by 98hotrodfatboy; Sep 7, 2016 at 05:28 PM.
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From: Lafayette, Louisiana
I am unfamiliar with ngk heat ranges, so 98hotrodfatboy may be right. I am more familiar with Autolite and automotive spark plugs.
I will say this though. A cooler heat range plug is better for a high compression engine.
If your engine is nearly stock and has not had any work done to increase the compression, then the recommended heat range is what you should use. A plug that is too cool may foul easier / sooner and will not perform as well.
Again, I don't have first hand knowledge of that other plug number to know if the heat range is the only difference. Long ago, I used to work at a retail auto parts store and had lots of resources available such as a huge stack of paper catalogs with lots of technical information as well as trade magazines covering a variety of topics including Dino vs synthetic oil. Lots of things have changed since that time.
I am always of the mindset of go with what is recommended unless I have a valid reason not to.
I will say this though. A cooler heat range plug is better for a high compression engine.
If your engine is nearly stock and has not had any work done to increase the compression, then the recommended heat range is what you should use. A plug that is too cool may foul easier / sooner and will not perform as well.
Again, I don't have first hand knowledge of that other plug number to know if the heat range is the only difference. Long ago, I used to work at a retail auto parts store and had lots of resources available such as a huge stack of paper catalogs with lots of technical information as well as trade magazines covering a variety of topics including Dino vs synthetic oil. Lots of things have changed since that time.
I am always of the mindset of go with what is recommended unless I have a valid reason not to.
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From: Brighton, MI
http://www.sparkplug-crossreference..../NGK_PN/BPR5ES
My stock bike (stage 1) would ping under certain load conditions with the BPR5ES. I went to the Denso W16exr-U and my bike loves it. No ping.
The denso plug sure looks like the accel "U" groove except for the color. YD
My stock bike (stage 1) would ping under certain load conditions with the BPR5ES. I went to the Denso W16exr-U and my bike loves it. No ping.
The denso plug sure looks like the accel "U" groove except for the color. YD
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From: Poolville
Sorry, my bad. Prot is correct about the direction of the heat range. I had it backwards. The BPR5ES will work fine. Nothing to worry about in a stock Evo. And for $5.00 a set, no big loss...
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