NGK B9HC vs B9HS Spark Plug?

[Syd]

Hello - Can anyone tell me what is the difference between a NGK B9HC vs NGK B9HS Spark Plug or are they basically the same spark plug?

[III]

Jan 24, 2020 4:02:27 GMT -5 Syd said:

Hello - Can anyone tell me what is the difference between a NGK B9HC vs NGK B9HS Spark Plug or are they basically the same spark plug?

NGK Letter Codes

[Syd]

Thanks but link goes to pic of spark plug in a red circle crossed out with the wording No Hotlinking Allowed?

[shiloh]

b9hs vs b9hc

B- shell(14mm thread)

R- resistor type(avoid those a little less punch but ok in a pinch)

9- heat range

H- reach(12.7mm)

C- low angle GE

S- firing end construction(2.5mm copper strand)

so b9hs is the one to use if the bikes manual says so. if you can find the iridium equivalent use those br9hix, though they are a resistor type, way more Bang for your buck(Pricy but last longer).

You`ll also find b(r)9hs-10, those are just factory gapped at 1mm(regardless always gap before installation).

Cheers

[III]

Jan 25, 2020 13:48:00 GMT -5 Syd said:

Thanks but link goes to pic of spark plug in a red circle crossed out with the wording No Hotlinking Allowed?

Sorry dude, it went to a page with a chart explaining all the codes Perry just showed in text.
You can look shit like that up with a google search.
It took me right to the NGK home page and that chart.


Here is one you can get to

link

[acceleration]

Are you referring to a B9HC "S" ? By comparison to a B9HS ? If so. The B9HCS is a different plug.It is a colder plug.The end of the plug thread has conical shape edge, and is not like the B9HS.The electrode on the B9HCS is shorter and farther down into the plug and shrouded more than the regular B9HS.It's a colder plug.It's good choice when you are going out on the HI WAY cruising at RPM.It will work for all around, but color a little darker if you are just putting around staying in the lower RPM range.But if you plan to cruise on the HI way and keep the Revs up.It will give a nice light brown tan color.Back in the day I used to keep a set under the seat and then if I was going on the hi way for a period of time, on a trip,I would put them in.Have different plug choices these days.

[shiloh]

A 9 is a 9, the next cooler plug would be a B10HS

probably acted like they are cooler because of the way the firing end is made.

[acceleration]

Yes you are absolutely right on the heat range.There are also different  heat ranges with in the number prefix.For fine tuning.For example there is also a B10H aside from a B10HS.Thought they are both "10'S" they are different.

[III]

Jan 25, 2020 20:12:06 GMT -5 shiloh said:

A 9 is a 9, the next cooler plug would be a B10HS

probably acted like they are cooler because of the way the firing end is made.

Right on Perry. the heat range is in the number.
8, 9, 10 etc.
The C denotes a different angle or design to the hook - electrode.
Just read the chart at NGK for a full explanation.
Videos are available on YouTube as well.

[H2 Dude]

I Use the B9HS in my H1B and no issue at all with fouling. I think Bikerdon also got some great mileage out of his plugs. Mine I think it was around 7000 miles before I change them, same as the waterbuffalo..I'll stick with good ol NGK ,no iridium or R plugs for me

[Syd]

Thanks for the info folks, it seems things are fine with the B9HS I am using. In the riders handbook, it says to use B9HC for standard riding, therefore I was just interested to know what is difference between B9HC and B9HS. All good

[acceleration]

All great info provided by you guys.It's pretty easy to determine the differences in heat ranges by looking at spark plugs.On the colder plug,the electrode will be farther down inside the plug and shrouded, and the electrode not be exposed in the combustion chamber on the colder plug, as much as the hotter plug.If you read the NGK, Champion, etc charts, and look at the pictures it explains all that too.Comparing the B9HS and the B9HCS physically, there is a visual difference in that respect, that can be seen.The electrode on the B9HC S is much farther down inside the plug.You can see the electrode sticking out on the B9HS, but can't on the B9HCS.It's a colder plug in the "10" heat range.But still in the "10" range.We all know the best way to determine if the plug is correct and the correct heat range, is by actually "reading" the plug.
Back in the mid 70'S I called DENCO a number of times to order parts for my Triple and to get tuning advice.I asked and talked about spark plugs, and was told:" Experiment with "heat ranges.Learn how to READ spark plugs. DENCO told me they used "CHAMPION GOLD PALLADIUM" spark plugs.Said they have real gold and platinum in them.And provide the broadest heat range of any plug.So I stocked up on them and using them ever since.They are long discontinued and have been out of production for decades.They were expensive even back then.I still have a number of sets, and that is what I like to run in my Triples.Of course everyone has their own favorite brand of oil, plugs, etc.. etc..And what ever works best is what you like.

[norm]

Keith, I recall the conversations and articles that were written back in the 70's about those Champion Gold Palladium plugs. I bought a few sets for my H2 at the time and they worked well .... just great to hear decades later about stuff like that that we did back then. 

[acceleration]

Dave, I went through a phase after talking on the phone with DENCO on doing exactly what they told me to do LOL !! IE: Learn as much as you can about plugs, and especially learn how to read them. I always wondered WHY ? They were always taking out the spark plugs and looking at them when I went with my uncle when he was racing the KONIG two stroke hydro plane racing boats ?
I got a few books, back then, and tried many different plugs available. And you learn something new every day. There are so many different plugs within a given heat range. That if you are fine tuning and you have to find one that gives you the color you are looking for. And if  a 9 is too hot ? And a 10 is too cold you have to find something in between ? There are no 9 1/2'S  LOL And that is why there are different Types of plugs available in a given heat range. Some slightly colder some slightly hotter.

[Syd]

One more question - are there any problems in using an ultrasonic cleaner for cleaning these spark plugs? I assume it would be a really good way to clean them?