Question about Spark Plugs BR4HS Plug 10/BX #3322

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What is the difference between BR8HS and BR4HS spark plugs. Cheers Paul

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The numbers 4 and 8 are heat ratings. The lower numbers run hotter. Different heat ratings allow you to choose the best compromise between keeping the plug from fouling and making the electrode last longer. If your plugs tend to foul, you need a hotter plug. If they tend to fry away, you need a cooler one. As engines get old, they tend to need hotter plugs. The differences in the heat ratings can be seen in subtle differences in the dimensions of the electrode (usually the center one) and the little insulator around the center electrode. The dimensional changes effect the heat transfer characteristics of the plugs, which changes how effectively the high temperatures present at the spark are conducted away. Besides the heat rating of the plug, the other big factor is having a nice clean thread surface in the engine block, which is why some mechanics will use a thread chaser when changing plugs. Here's a link to NGK's numbering meanings
I hope you found this helpful.

Posted on Aug 27, 2010


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I have a 1986 Suzuki dt40 will not get on plain rebuilt carb perform a sea foam shock seems better after that but also the lower plug was warm not hot and the primer bulb seems soft when running

Sounds like the carb(s) need a qualified professional cleaning and setting...The bulb should stay tight..
.. the lower cylinder was not = 1. Firing.. or 2. Not getting fuel..
.. I would replace both spark plugs,,,( NGK BR8HS Spark Plug ).. after getting the carbs professionally cleaned and set..

Jul 03, 2017 | Boating

2 Answers

What ngk plug will replace the champion plug i listed above

An auto parts store will tell you! advanced auto, autozone etc,

Apr 21, 2016 | Spark Plugs BR4HS Plug 10/BX #3322

1 Answer

Spark plug replacement

this the one should be able to order them in from repco supercheap or ebay any NGK plug carrier

Aug 21, 2014 | Spark Plugs BR4HS Plug 10/BX #3322

1 Answer

Spark plugs

You need a tool called a spark plug box, comes in two sizes so bring your old spark plug. You might also need a ratchet
that has a head that can be placed at different angles.

Aug 21, 2014 | Spark Plugs BR4HS Plug 10/BX #3322

1 Answer


I'd go with .35 for starters. Gaps shouldn't vary by plug maker.

Sep 25, 2013 | Spark Plugs BR4HS Plug 10/BX #3322

1 Answer

What is the correct spark plugs for a 3.5 v6 jacaroo

The gap may differ from manufacturer to manufacturer if you have the owners manual it will tell u. if not call your local parts store. they will help.

Mar 15, 2013 | Spark Plugs BR4HS Plug 10/BX #3322

1 Answer

Hi got a 1997 johnson outboard is a denso w24fsr spark plug ok for this motor cheers shaun

Stick with the NGK or try a Champion. A Johnson outboard is the only brand motor that will perform well with something besides a NGK.

Feb 28, 2010 | Spark Plugs BR4HS Plug 10/BX #3322

1 Answer

Recommended spark plugs

I would go back with factory plugs. that year model is designed to run many miles and i would stay with factory. I have an 04 model of the same engine.

Oct 05, 2008 | Spark Plugs BR4HS Plug 10/BX #3322

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