Changing out Spark plugs

ocgeek

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Aug 20, 2019
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another option for iridium sparks (for anyone interested in going that way)
are the DENSO IU24
(mind IU24 and NOT IU24A which are for cars)
 
B

ballisticexchris

Guest
Are they really worth $20 each? I’ll pass.
Actually they are worth the price. I have been using Iridium plugs in all my vehicles for for over 20 years. They last for a really long time. Not for everybody though. I try to get the best quality parts for my rides.
 

MattR

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My Zx14r has iridium plugs but they still need changing every 7k miles. They may look ok but the profile of the electrode changes slightly.


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MIKE R

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Lancashire, UK
because of the UK weather, my 2013 has 27000 miles on it, it has had new plugs every 12 months for the past 6 years, just to keep getting the coil sticks out ok.

rob
Like you I have my plugs out every year and replace them if needed. I also have my coil sticks checked and fuel filter cleaned at the same time!

In 2017 I had the bike serviced in May at 18k with new plugs. Whilst travelling up to the Arctic Circle in Norway in August I developed a misfire problem. It had been a VERY wet trip and on my return I took the bike in for the misfire problem. The plugs were pulled and ALL were VERY rusty after about 5k miles. The mechanic was amazed at their condition and commented that if he personally had not replaced the plugs in May he would have thought they were the original 2 year old plugs.

Turned out that the misfire was a clogged fuel filter probably caused by dirty fuel in Denmark.

Now on 42k without any more problems

Mike
 

Boris

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midlands. UK
because of the UK weather, my 2013 has 27000 miles on it, it has had new plugs every 12 months for the past 6 years, just to keep getting the coil sticks out ok.

rob
Yep, unfortunately the potential water ingress to the plug wells does make this a necessity, even if just to check. I fitted a fender extender just before the start of winter. It’ll be interesting to see if it makes much difference to water and debris around the coil top area.

I shall update next winter.
 

bimota

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bridgend, Wales, UK
hi boris,

the fender extender does work, the guy that services mine says the plugs etc are a hell of alot better than the ones he works on that don,t
have the extender

rob
 

MattR

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North Hampshire UK
Does the fender extender interfere with the skid pan when the forks are compressed? I’m getting a skid pan from Metal Mule soon so I guess I’ll need to wait and see.


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Boris

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Cycledude

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Rib lake wi
Yamaha design allowing those kind of very common water issues around spark plugs seems crazy to me, fortunately i have never experienced those issues, my Tenere’s have been ridden in a lot of rain but the deepest water they have ever been in was only a couple inches over the foot pegs a couple times.
 
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ballisticexchris

Guest
I ran my scope in the wells. I could see some small hloes in the sides around the sparkplug wells.
I would just take a drill and bore a 1/4" hole at an angle from just above the exhaust into the plug wells. That way the water drips on the exhaust and evaporates. Pretty simple fix.
 

WJBertrand

Ventura Highway
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I ran my scope in the wells. I could see some small hloes in the sides around the sparkplug wells.
Any idea where those holes lead? Blowing them out might be a good maintenance item to add to the list. The drains in my Hondas were pretty large, at lease 1/4". Maybe Yamaha did incorporate drains after all but they're too small and easily become blocked, which leads to the corrosion issues?
 

offcamber

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Enfield, NH USA
I see in some videos people are putting silicone around the coils to seal them. Is this necessary? I've never done it and haven't had an issue.
 

ocgeek

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i've seen one too (one good guy from Brasiz)
I did ask him and he said it was for the first gen, gen2 he said does have a different valve cover and there is no need to do so
When i changed my sparks i did not put any silicon on the seal
 
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