I've got an 06 610TE and have been chasing the jetting on the FCR for what seems like forever. I think I've made about 6 or 7 jetting/needle adjustments and who knows how many fuel screw changes. I finally got it as good as I was going to get it but it still had a slight hesitation at a bit less than 1/4 constant throttle...enough that it bugged me that I couldn't get it right. I decided to try the Irridium (NGK) plug even though it's pretty pricey for a plug...and you guessed it...FIXED! Warm up is a little better but most importantly thing thing now runs like it was intended to run. It's smooth and runs clean from idle to WFO. So if you're chasing jetting on your own bike...try the irridium...it will do wonders!
Interesting... Did you first try just a New Plug for a base setting... Or did you just take out the old plug and put in the Irridium ?
Yep...tried a new plug too(same heat range). Old one wasn't bad looking but I thought...what the hell, give it a try too!
I've tried the Denso Iridium plugs. Good plugs. Which ever you can get easiest, cheapest, NGK or Denso they both perform great!
I had the dreaded stumble at about 4200rpm. Everyone said "Iridium plug!" I did a little bit of research and ended up going with your average garden-variety non-resistor $3.95 plug (C8E? I can't remember...same as stock, just no R in it...) and voila'...no more stumble. WoodsChick
So that explains the radio noise I hear from your bike! No resistor. Just kidding. The iridium plugs do nice things for the single-cylinder thumpers, sure they are a touch expensive, but you only need one. Happy Finally Friday! Let's go ride.
I agree that iridium plugs are great too. I put one in my 510 and she starts and runs better that any bike I've owned. But I think the problem with the FCR carb is in the ac pump. Every time I run out of fuel and don't hit reserve before the carb runs dry, I have an off idle hesitation during acceleration. I found that if I prime the ac by holding the throttle wide open for a few seconds a few times ( with the engine off ) presto... the problem is gone. If anybody has a hesitation problem, you should try this, especialy if you are changing jets and you have emptied the float bowl. You need to pime the ac pump or the new jetting won't seem right. I also find the ac ajustment to be important. Big
Either NGK or Denso seem just as good as one another. Which ever you can get...hopefully with other items so to save on shipping. One comes with the nipple fixed, the other comes without, a standard one screws right on. I'm sorry I don't remember which is which. It's not going to give you more power or anything crazy, just easier starting, smoother idle. The itty bity iridium tip reaches it's self cleaning temp faster than types, this I understand is the main benefit.
You are absolutely right! #9 (permalink) TT Titanium Member Team TT Member rajobigguy's Avatar rajobigguy is a name known to all Join Date: Jan 2007 Location: California Age: 52 Re: NGK Iridium The real advantage of fine wire plugs such as platinum or iridium is not so much that they have a hotter or more intense spark but rather that they reach there self cleaning temp faster. When you first fire a motor it takes time for everything including you're spark plug to reach the ideal operating temp. The faster that you're plug reaches its "sef cleaning temp." the less likely you are to build carbon deposits on the electrodes which would inhibit the spark from ionizing the gap and causing a misfire. Also by reducing carbon build-up on the surface of the plug you reduce hot spots in the combustion chamber that would lead to pre-ignition. When you team those things up with the corrosion resistance of platinum or iridium you get a plug that will perform like new for a great many miles/hrs. longer and will perform better when cold or hot than a std. plug. so you're engine will start easier when cold, have fewer misfires when hot which means better overall performance and yes they are worth every penny if for no other reason than they last four times as long.
