Great spark plug info

DWRAT · #1 (**permalink**) 04-30-2008, 04:02 PM

I found this thread on a different site and didn't want to post a link to it so heres the first page about plugs.
Dan

While servicing my stock '07 Rhino 450 I replaced the standard NGK DR8EA spark plug with NGK's Iridium plug DR8EIX on the advice of a friend. I noticed an almost immediate improvement in starting and the Rhino seemed to idle and accelerate smoother than with the stock plug. It didn't seem to gain any more horsepower or accelerate faster, just smoother with a crisper throttle response. Just to make sure it was the spark plug making the difference, I changed back to a new DR8EA and immediately noticed it again didn't run as well. I couldn't believe a plug could make this much difference but it did. It apparently doesn't work for everything though. I put a new pair of Iridiums in my Harley hoping for the same result but they did not run as well as the stock Harley/Champion plugs. I am sold on the Iridium for my Rhino, and it is probably one of the cheapest performance mod's you can do.

Bought one today, will let you know how I find it once I get it in.

We've found a repeatable 1-2% horsepower increase using irridium plugs on automotive engines testing on engine dynos

I installed an iridium plug in my Rhino 660 last week. There was a night and day difference immediately. The Rhino fires up right away, and seems to run cleaner. I used to have to warm mine up for 2 or 3 minutes for it to run without sputtering or dying. Now I can fire it up and head out almost immediately. I was amazed at the difference from only a sparkplug!

Do you have a link for the spark plug? I want to order one and I think I found some on eBay, but I want to get the right one.

What brand and part number did you install?

The correct NGK Iridium spark plug numbers for the Yamaha Rhino's are as follows:

Rhino 450= DR8EIX

Rhino 660= DPR8EIX-9

They do not have a listing for the new 2008 700 EFI models as yet.

FYI.

I called an NGK distributor and asked what the difference was between the 2 plugs. They are the same size, thread count, heat range, etc. however the DPR8EIX-9 has an extended tip that is called for on the Rhino 660 and not the 450. Both are factory gapped at .036 and should not be re-gapped unless damaged in shipment, due to the potential of damaging the center electrode.

Mine starts without the choke more often but I noticed no difference other than that. My old NGK plug was good maybe that was why I never noticed any change. It had the correct gap when I checked it.
Jim

I got Mine at Orielly's$6.99 t tax alot cheaper than ordering online for $10.t. i got the DR8EIX FOR THE 450

Installed new plug this morning, seems to start easier and maybe run a little better. Worth the 7 bucks. I bought mine a Checker.

Ive been a mechanic for 30 yrs, and have never had a sparkplug help in starting a vehicle. I installed this plug in my 2006 660, that is way cold blooded, it fired before the 1st piston up. so I installed it in my 04 660, which I thought started real good before, and the same, instant starting. Got to love these plugs.

I put one of these in my 450 today. I was impressed at how quickly it started as well. I am planning on taking it out for a spin tomorrow so I can see if it improves the performance.

Thanks for the tip.

Great tip, Gonna go get one today. Whats the gap for a 06 660? Or are you gonna make me look it up? And Where do I find the application chart? I would be interested in one for my Yamaha golf cart too. IPLUMB.

IPLUMB, they are already gapped from the factory. Buy one, you won't regret it!

Picked one up this afternoon at Oreilly's Auto Parts. $7.50 each.

What's the torque spec. for tightening the plug?

Manual ('07 450) states 12.7 ft/lbs. My click torque wrench doesn't adjust that low, so I use my beam-style that measures inch pounds (12.7 ft/lbs = 152 in/lbs).

If you want metric, go here

I use a little high temp antiseze on the spark plug threads. This is always a good idea with any hardware that installs in aluminum.

Thanks for the tip on the torque, and the anti-seize. I remembered I'd downloaded the service manual for the 2006 660, and it stated 13lbs for the plug in the 660. I'm sure that 12.7 would have been enough tho'.
I have one coming from an ebay seller for $11. I opted for fast shipping, or it would have been $9. No local stores carried the plug.
I can't wait to try it out!

Do you have to get that exact with the torque? I've been replacing spark plugs on various motors for 40 years and I just tighten them until they feel right.

Anyway, I put one of the Iridium spark plugs in my 450 and it made a big difference in starting up. Before I had to use the choke to start it and then play with the choke to keep it running until it warmed up. With the Iridium plug it fires up without the choke and it doesn't stall out anymore. Cheap and easy add on that I think is well worth it. Time to change the plug...5 minutes. Most of the time was used up taking out the seat and putting it back in.

Works great. Definately a thumbs up. Has anyone tried the E3 plugs yet? I heard they haved worked really well in cars/trucks and they should now be available for atv's.

I jumped the gun on this before I read further. I have a 660 but got the plug for the 450, it runs just fine and is a definate impovement. Will i hurt anything by using the "wrong" plug?

Thanks,

if i would of know early i would of got one...today when i got my oil since i changed it today....darn it! oh well......
Also how much is a Rhino 660 air filter?

NGK Iridium spark plugfor a rhino 660= DPR8EIX-9 get at any auto parts store.....???
Also anybody got a price range on a new stock air Filter or how to clean it up good?

thanks i will have to read up on that....
also...what would a spare filter (stock) COst?

roamerr · #2 (**permalink**) 04-30-2008, 04:20 PM

Saw this on another forum also. I purchased a NGK Iridium DPR8EIX-9 today for my 660 ($6.99 or so at O'Reilly's). I will admit it is an improvement when cold. Once it cranks I can pretty much cut the choke off after 5 seconds and it just runs. No bogging when put in gear cold.

I have never seen a plug make a differnence but this one definitely does cold. I always thought my Rhino did good when cold but now it does even better! Not sure why it works better....

**Chandler** · #3 (**permalink**) 04-30-2008, 04:35 PM

Thanks for sharing. Seems like a good plug to use.

**trooper522** · #4 (**permalink**) 05-13-2008, 09:03 PM

I just replaced mine tonight and took it for a spin up and down the street. Wow what an amazing difference, deffinatly smoother running and good crisp throttle response. Im sold on these, in fact Im picking another one up just to keep as a spare. Thanks for the info on this, its almost as tho the rhino was meant to run on this plug, great info.