NGK B6HS Spark Plug

Discussion in '2-Stroke Engines' started by Timbone, Sep 7, 2014.

  1. Timbone

    Timbone Active Member

    I recently replaced my stock sparkplug with a NGK B6HS and the results are stunning! My moto can't go any faster (until I gear it a tad larger) but it runs so much better! Huge difference! The engine runs quieter, stronger and steadier. I can tell that the CDI and the NGK plug get along really well.

    If you are having any issues at all with engine performance,upgrade the spark plug!

    I keep learning...

  2. Fabian

    Fabian Well-Known Member

    A good spark plug makes the world of difference.
  3. Ratty Natty

    Ratty Natty New Member


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

    HeadSmess Well-Known Member

    makes no real difference, just the 8 runs a bit cooler, gets a bit blacker on the insulator nose, but probably better for long WOT rides in mid summer...

    personal preference is for the "r", br6hs...
  5. Ratty Natty

    Ratty Natty New Member

    cool thanks. I was wondering what the hot plug was. I just used the catalogue and cross referenced all the 50cc motors and took a guess. It runs better. The motor is tired. Its a process of elimination.
  6. butre

    butre Well-Known Member

    I've found that a good plug wire makes a really huge difference too. I've got a plug wire from a Mopar of some sort (guessing a neon type thing based on the length) that I found in a junk box on the side of the road one day and it immediately solved the problem I had with the thing missing at idle and while climbing revs.
    Timbone likes this.
  7. HeadSmess

    HeadSmess Well-Known Member


    i tried proper 15kv neon sign cable, cus i had a few metres of the stuff...

    but even pinching an old silicone lead from the (someone elses) car is better than the stock POS.

    and the plug boots on car leads are 125.265% better than the stock boots. just make sure the top cap on the plug itself is done up tight or that starts to be the letdown! it keeps undoing! also just gently crimping the spark plug boot so the terminal inside grips the plug a bit tighter...392.472% improvement over stock. :mad5:
  8. sickboy

    sickboy New Member

    Hey guys, where do I buy the ngk-b6hs plug? I have searched online at O'Reilly, Napa, AutoZone, and a small parts house here in Conroe, Tx with no luck.
  9. butre

    butre Well-Known Member

  10. Fabian

    Fabian Well-Known Member

    NGK always has proven to be a reliable spark plug, at least in my experience.

    SickBikeParts sells the ngk-b6hs, but i prefer the NKG BP-6HS which features a projector nose, getting the firing tip further away from the combustion chamber wall.

    I have always run the #8 heat range because my engine works hard (operating for extended periods of full throttle), all day, every day.
  11. Purple Haze

    Purple Haze Active Member

    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 #.
  12. Gobisox

    Gobisox Member

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

    sickboy New Member

    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
  14. KCvale

    KCvale Motorized Bicycle Vendor

    Just some spark plug tips:
    The NGK's are just a tad longer than the stock plugs, this gives you a bit more compression.

    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 or from
  15. twitch0601

    twitch0601 New Member

    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.
    Timbone likes this.
  16. Fly1

    Fly1 Member

    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