Nearly brand new plug fouling?


Just bought 3 from advanced auto in gaylord mi (national chain of stores on line too) BR9ECS 5.09, BR9ECSIX (iridium) 6.09! They also had BR9ECS-5 for 5.09. Had never heard of these asked guy at counter and he no idea what difference was. Did an on line search and its coming up as a DOO plug for 02 and newer. Cant find out what the differance was but the online stores I was looking at wanted 3 bucks more per plug with the 5 on there. Any body know what the differance is?
 
There are 3 new NGK Iridium ECS version spark plugs available for snowmobiles. These are the same as the other ECS spark plugs which have chamfered faces where the ground electrode is attached by welding. This chamfer was added to strengthen the weld and eliminate electrode burn off. The chamfer is also added to allow better flame propagation. The one with the -5 (must stand for 0.5mm) is for sleds that require 0.020" gaps. They are listed under Accessories on BRP site. Also listed is standard NGK ECS spark plugs.

BR8ECSIX Doo Part No. 515176726 NGK Part No. 5886 gap 0.032"

BR9ECSIX Doo Part No. 515176728 NGK Part No. 5438 gap 0.032"

BR9ECSIX-5 Doo Part No. 515176729 NGK Part No. 6014 gap 0.020"

BR9ECS NGK Part No. 4677 .028-.032" gap solid top (Original Mach Z plug)

BR9ECS NGK Part No. 4771 .018-.020" gap solid top (Do not use in Mach Z)

BR9ECS NGK Part No. 3570 .028-.032" gap screw top (Aftermarket available)

BR8ECS NGK Part No. 4172.028-,032" gap solid top (Aftermarket available now)

You can buy 9ECS NGK No. 3570 from some auto parts stores (NAPA for one) for less than $4. The 8ECS is now available at aftermarket stores also. Below is a listing of NGK plug numbers.

DO NOT re-gap ECS plugs due to the way the electrode is welded to the plug ground. Bending the electrode will weaken the electrode weld. The ground is chamfered to improve the weld on the ECS electrode. If the gap is incorrect ask dealer for a new plug. Here is a pic showing difference between standard NGK plug and NGK ECS plug on the right.
 
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Devilin AblueDress! said:
Just bought 3 from advanced auto in gaylord mi (national chain of stores on line too) BR9ECS 5.09, BR9ECSIX (iridium) 6.09! They also had BR9ECS-5 for 5.09. Had never heard of these asked guy at counter and he no idea what difference was. Did an on line search and its coming up as a DOO plug for 02 and newer. Cant find out what the differance was but the online stores I was looking at wanted 3 bucks more per plug with the 5 on there. Any body know what the differance is?
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I can get the BR9ECS for $5.09 but the BR9ECIX was $11.49 here at advanced.
One dollar difference, thats strange?
 
A question regarding my machine. Would a fouled plug cause the machine to have a slightly bogging sound, and not as much power? I went for a 4 hour ride on saturday, and the last half hour it sounded a little boggy and didn't have full power. Maybe 85% power.
 
a plug or plugs fouling out could cause the sled to not run at its peak yes. there are a number of potential factors.... but plugs are by far the easiest to replace and / or check.
 
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