2004 KX-125 Spark Plug Query

Rupert X
Profile picture for user Rupert X
Posts
10894
Joined
4/1/2008
Location
Newark, OH US
Rupert X
Edited Date/Time 3/12/2013 3:49pm
Motosport lists the standard KX-125 spark plug at 60 buck$. Okay, $ 45 your good guy price.

They show the OPTIONAL plug being about $15 - .

Is the $45.00 plug good for an extra 5 horse ? Anyone have any wise-ass remarks or inside data to assist

this confused and befuddled scallywag ? Thanks...

http://www.motosport.com/dirtbike/oem-parts/KAWASAKI/2004/KX125/IGNITIO…
|
Rupert X
Profile picture for user Rupert X
Posts
10894
Joined
4/1/2008
Location
Newark, OH US
Rupert X 3/8/2013 1:19pm
3/8/2013 1:19pm
Rupert X
Profile picture for user Rupert X
Posts
10894
Joined
4/1/2008
Location
Newark, OH US
Rupert X 3/8/2013 1:26pm
3/8/2013 1:26pm


























mx5471
Profile picture for user mx5471
Posts
986
Joined
7/10/2008
Location
AL US
mx5471 3/8/2013 4:53pm
3/8/2013 4:53pm
Huge waste of time here.
motofab36
Profile picture for user motofab36
Posts
1426
Joined
4/1/2008
Location
Cowden, IL US
motofab36 3/8/2013 8:24pm
3/8/2013 8:24pm
mx5471 wrote:
Huge waste of time here.
?Huh

The Shop

See All »
rick's mx
Profile picture for user rick's mx
Posts
10
Joined
8/15/2012
Location
Oskaloosa, IA US
rick's mx 3/9/2013 8:15am
3/9/2013 8:15am
In my ngk book they list only one plug for your bike, r7376-10 available at any parts unlimited dealer for $36.95. Kawasaki lists this plug as an option along with r7376-8.

They show plug # r6918b-9 and r7376-9 as no longer available through kawasaki.

Neither ngk or kawasaki list br10eix as an option so I would stay away from that plug if it were my bike. Bad things can happen to 2 strokes when you put the wrong plug in them.
slipdog
Profile picture for user slipdog
Posts
10055
Joined
7/25/2009
Location
Nor Cal, CA US
slipdog 3/9/2013 10:00am
3/9/2013 10:00am
Rup, this is about the RM, but looks like it may apply to the KX also.


First I would like to explain why the R6918B-8 is so expensive. This particular spark plug was designed and engineered for this specific application. Due to the fact the production volume is lower and the number of spark plugs sold is much lower then that of the BR9ES, the cost of the spark plug is increased. The production costs and the
fact this spark plug utilizes gold palladium, a precious metal the cost is much more.

The Suzuki RM125 is a high revving, high compression engine and has vibration issues throughout the power band. We've tested with Suzuki and found the ES, EG, EV and EGV and determined these spark plugs fail under certain loads and conditions. If you compare the two spark plugs you'll notice a major difference in ground electrode design.
The R6918B has an electrode designed to withstand severe vibration and possible detonation associated with these bikes. A standard spark plugs ground electrode is
welded on the outside of the metal shell and can vibrate like a tuning fork throughout certain rpm ranges. This severe vibration causes fatigue and the ground electrode fails. This is why the R6918B was chosen for this application. The R6918B is very reliable and durable in these conditions. Ignitability with this spark plug is better then the
ES series due to the diameter of the center electrode. Any time you have a racing engine you need to choose a spark plug designed to withstand this type of environment.

I would also like to inform you I am the person who takes care of damage
claims at NGK Spark Plugs. I have had more BR8ES and BR9ES spark plugs
cross my desk every month with broken ground electrodes and receipts for
repairs. When the ground electrode fails it bounces around leaving indentations in the cylinder head and the top of the piston. If your lucky the ground electrode will sneak out of the cylinder, however if your not the
ground electrode wedges itself between the piston and cylinder wall and intern destroys the engine.

I hope I have helped you in better understanding why this spark plug is used in this application. If you have any questions or concerns please feel free
to contact me at (248) 926-6900 ext 248.

Sincerely,

Jon MacQuarrie

Jon MacQuarrie
Technical Customer Service Representative
jmacquarrie@ngksparkplugs.com"
Rupert X
Profile picture for user Rupert X
Posts
10894
Joined
4/1/2008
Location
Newark, OH US
Rupert X 3/9/2013 2:18pm
3/9/2013 2:18pm
slipdog wrote:
Rup, this is about the RM, but looks like it may apply to the KX also. First I would like to explain why the R6918B-8 is...
Rup, this is about the RM, but looks like it may apply to the KX also.


First I would like to explain why the R6918B-8 is so expensive. This particular spark plug was designed and engineered for this specific application. Due to the fact the production volume is lower and the number of spark plugs sold is much lower then that of the BR9ES, the cost of the spark plug is increased. The production costs and the
fact this spark plug utilizes gold palladium, a precious metal the cost is much more.

The Suzuki RM125 is a high revving, high compression engine and has vibration issues throughout the power band. We've tested with Suzuki and found the ES, EG, EV and EGV and determined these spark plugs fail under certain loads and conditions. If you compare the two spark plugs you'll notice a major difference in ground electrode design.
The R6918B has an electrode designed to withstand severe vibration and possible detonation associated with these bikes. A standard spark plugs ground electrode is
welded on the outside of the metal shell and can vibrate like a tuning fork throughout certain rpm ranges. This severe vibration causes fatigue and the ground electrode fails. This is why the R6918B was chosen for this application. The R6918B is very reliable and durable in these conditions. Ignitability with this spark plug is better then the
ES series due to the diameter of the center electrode. Any time you have a racing engine you need to choose a spark plug designed to withstand this type of environment.

I would also like to inform you I am the person who takes care of damage
claims at NGK Spark Plugs. I have had more BR8ES and BR9ES spark plugs
cross my desk every month with broken ground electrodes and receipts for
repairs. When the ground electrode fails it bounces around leaving indentations in the cylinder head and the top of the piston. If your lucky the ground electrode will sneak out of the cylinder, however if your not the
ground electrode wedges itself between the piston and cylinder wall and intern destroys the engine.

I hope I have helped you in better understanding why this spark plug is used in this application. If you have any questions or concerns please feel free
to contact me at (248) 926-6900 ext 248.

Sincerely,

Jon MacQuarrie

Jon MacQuarrie
Technical Customer Service Representative
jmacquarrie@ngksparkplugs.com"
Thanks brother, that explains a lot.
Rupert X
Profile picture for user Rupert X
Posts
10894
Joined
4/1/2008
Location
Newark, OH US
Rupert X 3/12/2013 3:49pm
3/12/2013 3:49pm
Will do - I've been using ROCKAUTO for a few years for very inexpensive car parts - plus great service....

Cheers - and thanks again.

Post a reply to: 2004 KX-125 Spark Plug Query