NGK B6HS Spark Plug

[Purple Haze]

I get mine at O'Reilly, they just have a different part # Get your "parts pro" to look it up, or go to their website and get their #.

 

[Gobisox]

Nabbed mine at Advance Auto parts. Cheap, so picked up a couple and keep one in the tool bag on the bike.

 

[sickboy]

I got an auto lite equivalent at advance auto. Not really a big fan of autolite but it runs much better now at low rpm's. Thanks for the help guys

 

[KCvale]

I got an auto lite equivalent at advance auto. Not really a big fan of autolite but it runs much better now at low rpm's. Thanks for the help guys

Just some spark plug tips:
The NGK's are just a tad longer than the stock plugs, this gives you a bit more compression.
DO NOT TRY TO USE AN NGK ON A HIGH COMPRESSION HEAD, IT WILL HIT THE PISTON!

Though the NGK 5111 (BPR7HS) is a fine plug it's not as good as the NGK 5844 (BPR7HIX) Iridium plug, that's what I use in every new 2-stroke build and they will usually last the life of the engine.
These plugs come pre-gapped with a protective cover of the threaded part.

The middle number is the heat index.

The more white you have in contact where the threads are, the more heat is transferred to the cooling fins, and the pink is just providing an air gap to keep heat in.

I would also have to argue that an air cooled motor dissipates much more heat much quicker in a freezing wind opposed to a frigg'n hot one.

----
Engine Speed and Load

* If the engine is to be operated at high RPM, under a heavy load, or at high temperatures for long periods a colder heat range may be needed.
* Conversely, if the engine is to be operated at low speeds or at low temperatures for long periods, a hotter heat range might be needed to prevent fouling.
----

The basic rule of thumb is run as cold a plug as you can until you start fouling plugs from not enough heat to keep your engine cooler.

You can buy either plug direct from NGK.com or from SickBikeParts.com

 

[twitch0601]

Just to help anyone. I got the NGK BPR7HIX at Oreilly Auto. It wasn't is stock but the got it in the next morning. Very quick. Quicker than ordering one online. There $7.99 and the part number is 5944. Just search it on their website or call them and give them the part number and they will tell you if its in stock or if there is one close by.

 

[Fly1]

Funny I have been in the process of breaking in my engine. Been using the stock plug that came with my
engine & planned on changing it out after break in. I was not sure what plug was recommened, but went
to my ole racing go kart stuff to see what in there.

I knew the Yamaha & Italy engines where long reach plugs & would not work.But I found a bunch
of NKG6 plugs I used in the ole Mcculloch racing kart engines. That's how far back I go, Mmmmmmmmmmmm

Fly

 

[KaptainKhronic]

thanks

I took a stab in the dark. I put in the b8hs I will change to the 6.

Appearently Chinese spark plugs go by....the higher the number the colder the plug the lower the number the hotter it sparks

 

[Pablo]

Appearently Chinese spark plugs go by....the higher the number the colder the plug the lower the number the hotter it sparks

Well. Yes and No.

NGK is a Japanese company, and yes the higher the number the colder the heat range. Heat range has nothing to do with "hotter...sparks"

Here: https://www.ngkntk.in/importance-of-heat-range/