How to gap a BKR6EKU plug

[428street]

I've done searches here and on other forums including a global search on Google but I can't seem to find the answer as to how to gap, or if I have to, the plugs for my 07 HPDI 250. My engine info is:

Yamaha 60X
VZ250TLR
L
1004853
J

01/07

I looked in the Yamaha manual and it states:

Spark plug (NGK): BKR6EKU

Spark plug gap:
1.5–1.6 mm (0.059–0.063 in)

What I can't find is how to gap the plugs are they have non-standard tips, one on each side of the plug.

If it's obvious and I missed something I give permission to hit me over the head with a cast iron frying pan. Thanks in advance.

[boscoe99]

Generally NGK spark plugs will be gapped correctly right out of the box. But they should always be checked to ensure they are correctly gapped, and only adjusted if necessary. The side electrodes can be tapped gently inward if the clearance needs to be reduced or a gapping tool used to increase/decrease the clearance.

[cpostis]

I've done searches here and on other forums including a global search on Google but I can't seem to find the answer as to how to gap, or if I have to, the plugs for my 07 HPDI 250. My engine info is:

Yamaha 60X
VZ250TLR
L
1004853
J

01/07

I looked in the Yamaha manual and it states:

Spark plug (NGK): BKR6EKU

Spark plug gap:
1.5–1.6 mm (0.059–0.063 in)

What I can't find is how to gap the plugs are they have non-standard tips, one on each side of the plug.

If it's obvious and I missed something I give permission to hit me over the head with a cast iron frying pan. Thanks in advance.

Interesting? Look up specs on this plug in the link below. NGK says gap 024" (0.6mm). Is Yamaha from ground to ground allowing for the thickness of the electrode, NGK from ground to electrode?
https://www.ngk.com/product.aspx?zpid=9336
I edited, had it bas ackwards.

[boscoe99]

Interesting? Look up specs on this plug in the link below. NGK says gap 024" (0.6mm). Is Yamaha from ground to ground allowing for the thickness of the electrode, NGK from ground to electrode?
https://www.ngk.com/product.aspx?zpid=9336
I edited, had it bas ackwards.

Depends upon how the clearance is measured. No one ever said that owning a Yamaha and understanding their data was going to be easy.

The 0.6mm is from the inner surface of the side electrode to the outer surface of the porcelain insulator.

Remember, a cat can be skinned from back to front or from front to back.

http://ngkntk.co.uk/wp-content/uploa...ugs-20-QAs.pdf

[428street]

Thanks guys, awesome info and exactly what I was looking for. I bought this bought last year and it had 110 hrs. on it. It's a Skeeter iClass bass boat. Just getting around to going through it. I know there are a bunch of filters and things I need to maintenance on a regular basis as well. I've been using the Yamaha additive as well on all fill ups.

[rodbolt17]

the easiest way you ask?
look up the tech bulliten, buy a 1/16th pin punch and follow the bulliten.
problem with the .024" method is the insulator is tapered.
the pin method eliminates operator error.
the pin method is faster.
it is easier.
the pin can be had for less than 3 bucks or so.

[428street]

rodbolt, thank you for the response. Here is my disconnect. Do you use the pin punch to adjust the metal leg or just check for the proper clearance between the end of the leg and the insulator surface? I'm not a mechanic but fairly mechanical. I've gapped many traditional spark plugs with the standard round tool with the different preset gaps and tool to open and close the metal single leg. When I figure this out I'm going to create a video to do this properly as I can't find one anywhere. Maybe its so simple its stupid but I'm a better learner seeing something vs. reading.

[rodbolt17]

hold the plug vertical.
hold the pin horizontal.
measure between the ground electrode tips and the center electrode.
there are two methods, the 1/16th pin method is the easiest.
adjust the ground electrode so the pin fits .

[cpostis]

Just in case you're interested...

Here's a video on operation, advantages, and disadvantages of "Multi - Ground Spark Plugs"

https://www.youtube.com/watch?v=53yfHLdn41k

[428street]

Thank you for the continued responses...makes sense now...

[cpostis]

428:
Just found this from NGK, take it as you will.

[428street]

Ha ha, probably thinking way to much about this but the manual for my motor says 1.5 - 1.6 mm...how does that translate into 024 or 0.6 mm. I know the question is 1.5 - 1.6 from where to where...there is a diagram showing the brackets and distance to measure but again I'm not sure where the 0.6 comes from...NGK or Yamaha

My concern is what NGK vs. was yamaha recommends.

Again, hit me over the head with a frying pan if I am missing something clear as day.

Also, cpostis, this is for a standard plug which I don't have...or is the thing you wanted me to see...gapping should never be attempted...

[cpostis]

"Gapping should never be attempted on Muti-ground plugs" is what I mean "take it as you will".
Rodbolt's method is Rodbolt's way. Checking gap is one thing, adjusting is another. Probably gap is good out of the box.

[TownsendsFJR1300]

Here ya go:

(Under spec's as well)

https://www.ngk.com/product.aspx?zpid=9336

[428street]

so the plug manufacturers gap trumps the engine makers gap?