| Author | Message | ||
     Roblast |
Long story short : If I run a Denso IXU24 iridium plug instead of the IXU27 I know it's the hotter plug - but am I going to do any damage? What do I need to look out for? Told mechanic (NOT dealer) at drop off that I wanted the colder plug installed, picked bike up today & it's got the 24. Just plain don't have time to do this stuff myself right now. I was in a huge hurry & he pulls out some catalog and tells me the 24 IS the colder one. It's not, it it!!!??? | ||
| Swampy |
I am not the sparkplug expert, I would just go with the standard plug. I would be very afraid to put any hotter of a plug in the Blast without enrichening it. What to look for?....You need to ask what to listen for first...you do not want to hear any pinging when you roll the throttle on or start to load the engine. Pinging or spark knock is the fuel burning really fast, not slow and controlled during the combustion or power stroke, the pressure rises too fast in the cylinder and can break ring lands and burn holes in pistons. If you remove the spark plug and look at it you will find the color of the electrodes white, not a tan color and you will find small round deposits fused to the electrodes and insulator that were parts of your piston that have melted. Some times a too hot spark plug will noticibly hurt you performance and will eventually ruin your engine. | ||
| Buellistic |
Spark plug manufactures name on spark plug the higher number is hotter the lower number is colder ... Harley-Davidson spark plugs the lower number is hotter and the higher number is colder ... | ||
| Roblast |
Swampy - "standard" plug... that's the question. From what I've gathered the 27 would be the standard from this board but the Denso website, and mechanic's catalog say the 24. That's why I'm wondering a bit. btw - no pinging today, sounded good as ever. Buellistic - If I get what you're saying (which maybe I don't)... A Denso plug is *not* a H-D plug so the 27 should be hotter than the 24. But... a quote of the Denso website: " A good, general rule of thumb is to start with the factory recommended heat range. For every 75 to 100 hp you add to your engine, you may go to the next colder step. DENSO heat ranges move up as they get colder; 16 would be our hottest Iridium Power plug, 34 would be our coldest (ranges; 16,20,22,24,27,31,34)" | ||
| Ezblast |
The 24 is between 7 and 8, a bit too hot for distance riding, around town would probably be ok. I would not recommend it at all though - a hot plug helped nuke my motor the first time I had to do a rebuild - put a hole right through that stock piston - sucked a valve due to that as well - she hemorrhaged both ways - coasting to the station - but at least I wasn't stranded on the side of the road - lol EZ | ||
| Roblast |
So, since it's been reasonably cold here, I stored the bike until this past week. I didn't have time to change out the IXU24, but I figured, it's only gonna be in the 50's it'll be ok for 1 or 2 rides. It was. Yesterday I changed out the plug for an NGK DPR9EIX-9. (Next tie I go for the DCPR9EIX-9, as it has the 5/8 hex, but that's a small detail). I was amazed at how easy it was to pull the tank. I'd never done it before. Oh, and big kudos to whoever posted at one point that you can just slide the tank back to access the plug w/out pulling the fuel line off the shutoff!!!! Anyway, I snapped a pic of the IXU24 plug I removed. It had about 110 miles on it. 15 were city miles, the rest backcountry roads at highway speeds. +++ jpeg +++ 667433 +++ IXU24 after 110 miles +++ I'm just wondering what the "diagnosis" on the plug would be. Oveheated? I'd say so based on the brown mark on the insulator. I'm really wondering about the blackening on the threads closest to the insulator. Is that something to worry about? How do I get the pic of the plug to show up? I uploaded it... (Message edited by RoBlast on February 05, 2012) | ||
| Roblast |
Got it - way hard to keep it under 103KB & still useful...  | ||
| Ezblast |
The threads ok, the burning - glad you caught it in time. EZ | ||
| Roblast |
I can't believe that there was a scorch mark after only 110 miles in 50 degree weather. That's kinda scary. Seems like I coulda fried the engine pretty easily. Thanks, as always, EZ. | ||
| Ezblast |
A little note - though the Racing Denso is said to last 50,000 miles before needing changing, however, it would be good to inspect it every 8000 miles or so to clean any deposits that may occur from dirty gas, etc. - experience - lol. EZ |
