Suzuki GSX650F Forum - www.GSX650F.biz

Hey guys,

Spring is arriving fast here in the Midwest. My k8 has over 9k miles on it and I was going to change out my plugs before riding season gets here. My question is which spark plugs to go with. I was looking online at part numbers and they list a few different ones. I was planning on going with the NGK's.

These are the one's they list.
NGK,CR8E
NGK,CR7E (opt)
NGK,CR9E(opt)

I am assuming I should get the CR8E's I just wasn't sure if certain plugs are for certain climates.
Am I better off just checking with my dealer?

NGK CR8Eix (iridium)
Got them on ebay.

stick with the stockers (CR8E or if you like the iridium equivalent but at 4-5 times the cost here in Oz I couldn't see the benefit) if you are riding normally

if you are riding like a demon (ie near redline and gunning the hell out of it all the time) in hot climates then look into going 1 step colder

if you are driving miss daisy in town or jsut enjoyng the scenery at a lesurly pace and never get above 5-6000 rpm in a cold climate then look into going 1 step hotter

staying with the stocker will give a good compromise between both worlds.

Here in Holland the normal plugs are about € 7 a piece
Iridium costs about € 19.... yes a lot more.
But I found them on EBay... total cost (4 sparkplugs) 35 English ponds... about € 40 including shipping !
The difference is getting less, the choise is getting easyer

Does anyone feel a difference with the Iridium plugs?

21000km , didn't mis a spark.....,
still going strong.

normally you have to change the stock sparkplugs every 12000km

you can notice the difference in the sound, only slight

i think they can make a difference, espically if you got a k&n and pipe

The benifit is longevity, you will either sell or wear out your bike before an iridium plug wears out. No real performance gains other than a long service life should be expected. And with what it takes to change the plugs in this bike, the cost is a small price to pay. I put a value on my time spent also, hence do it once do it right and never have to worry about it again. (for the price here in the US)

The color of the plug is about carb settings/ignition so I prefer inspection and therefore iridium does not mean "no checking at all" for me.

http://www.ngksparkplugs.com/products/s ... p?mode=nml

Denso has a far better website but does not know the gsx650f model
http://www.densoiridium.com/ir_power.php

I'm considering trying these Autolite iridium plugs. But it is totally confusing trying to figure out which one to get.

EDIT: Found it! It's XS4303
Can't wait to pop these in there, along with my new K&N air filter.

Or NGK CR8EIX

Yep, I know those are good. Just thought I'd try out these new Autolites- can't find a review. They sponsor Prostock drag bikes, so looks like they are developing their bike plugs.

GSXCherrios swapped out his plugs for iridium's and a K&N at the same time, he said it made a NOTICEABLE difference. Now do I trust his Butt Dyno....sure why not!

BTW, the Autolite XS4303 plugs are great!!

Note also with iriduim spark plugs, you should also have less carbon build up on th piston head aswell from using them, plus better life and spark with them than the stock plugs.