If the boots have been changed and there is a resistor built into them you run a risk of creating too much resistance against the CDI and shortening the life span of the capacitors.if not blowing them. Yamaha states that either B8HS or BR8HS plugs can be used in the stock head with the stock plug boots. I did not include these.ĭo keep in mind resistor plugs should only be used if there is no resistor in the plug caps. Note: Sometimes you will see a part number followed by -10 or -11. NGK's part number for a removeable nut tip BR8ES is 5422 and NGK's part number for a solid tip BR8ES is 3961 so there is a difference.ī7HS - 14mm Thread, no resistor, 7 heat range, 1/2" thread reach, standard 2.5mm center electrode.īR7ES - 14mm Thread, resistor, 7 heat range, 3/4" thread reach, standard center electrode. instead of asking for "BR8ES" you want "BR8ES Solid".
If you are searching online you will want to add "solid" to the end of the part number to get a solid tip. Stud tips are not used in our applications. If you use these in your build you might find that the vibrations make the tips back off, causing loss of spark/poor performance. Removeable nut tips allow you to unscrew the nut on the tip. Solid as it implies is solid and won't unscrew. Plugs are available in either solid, removeable nut, or stud tips (tip = spark plug wire end).
Most common for us H (1/2"), E (3/4")įifth (Letter) - Usually an "S" which stands for Standard 2.5mm center electrode ( Heat Range Explained).įourth (Letter) - Thread reach (how long the threaded part is, thus influencing how far down it reaches into the cylinder). For example 7 is stock for a 701cc superjet. Factory superjet calls for one without a resistor. So this shouldn't really matter in your average stand-up whether or not it has a resistor. Plugs with a resistor are recommended in applications with on-board computer systems/GPS/depth finders etc. R means there is a 5k ohm resistor in the plug to suppress ignition noise. Some parts counter guys can’t cross reference so make it easier for them.įirst (Letter) - Thread Diameter. If you go to a parts store, you’ll want to give them the regular part # I have listed. Note: NGK Part # helps you decipher what it is. Might help you decide what to use in a pinch or at the very least help you figure out the myriad of plugs hiding in your truck (wait, is that just me).
This post includes part numbers for solid tip plugs as well as other useful information on decoding NGK plug part numbers. I was looking up some part numbers on NGK’s website and figured I would put them into a table and share.
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