Running BR8ES instead of BR9ES

dirtjumper895

dirtjumper895

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Joined
Aug 1, 2008
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372
Age
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Location
Suffolk, VA
Can i do it in my sled? I seem to foul 9's was thinking a little hotter may help keep the unburnt fuel burning....


Mods are,

Speedwerx Triples
Speedwerx 12:1 Billet head
93 octane running Amsoil Dominator
Oil pump 20.8 mm
160 MJ 50PJ Needle at 3 or 4 (cant remember)
Plug Chops looked excellant
Carbs are clean


This sled is my mountain sled, lots of hard running, I do fan the throttle to keep motor cool.


Biggest worry is cooking a hole in the top of my pistons from the hottter plug.

Try it, or stick with carrying a couple spare 9's?



Thanks!
 
i think you are supose to run BR9ECS in a stock sled.. i dont know if it makes a diffrence or not.. i run BR9ECSIX... just saying.
 
The "C" only signifies that its a 5/8" hex instead of the 13/16" hex... the IX is an iridium plug, and for how i went through them while tuning last year, im glad i didnt fork out the cash for the iridiums... Maybe now that my jetting is close, i should run the iriduims?
 
dont know how to explain it but the ECS plug is tapered around the the ground strap and electrode, the regular ES is not. Doubt that slight taper would keep your plugs from fouling, but maybe. Plus they are very expensive, ECS plug is almost $7 ea at local shop, compared to $2 for regular ES.
 
I was told by an NGK rep that ECS and IX are anti fouling. when you look at the ceramic by the electrode it is concaved in by the electrode. Once these plugs reach operating temperature they emit small discharge sparks off the side of the electrode that chews/eats away the carbon deposits that cause the plug to foul before they actually touch the elctrode and foul the plug. Also the IX has a tapered ground strap to help it cool so that preignition does not happen with high ethanol fuels.
 
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Hmmm... Maybe i throw 3 BR9ECS's in and see how they work... Did not know about that taper...
Click to expand...
yep, dont run 8s, also if you like amsoil run interceptor not dominator, dominator is horrible on the powervalves
 
staggs65 said:
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yep, dont run 8s, also if you like amsoil run interceptor not dominator, dominator is horrible on the powervalves
Click to expand...


Why do you say not to run 8's? Im probably going to switch to Interceptor anyways...
 
8,s are a hotter running plug,,, you don't want to run hotter than recommended....
 
i run the es plugs in mine and dont have any problems, watch hotter plugs, if its too much youll end up melting down a piston. x2 on the interceptor, its made specifically for powervalved motors, as little residue as possible.
 
If you're fouling plugs, jetting still possibly isn't right. Or, the oiler cable is stuck or pulled apart at the joint. My oiler setting is at about 20mm (probably could adjust this, seems pretty rich), so I don't think the setting is the problem. I had a problem with fouling plugs for a couple of rides, until I noticed that I had pulled the oiler cable apart at the joint during carb cleaning and re-installing the air box afterwards. It would foul them when running at low rpm's, like when I was putt-ing along looking at a line I wanted to hill climb. Fit the joint back together and changed the cable routing a little bit around the air box, and no more fouling. I change my plugs every season, but just for maintenance, never foul them. I'm running BR9ES.
 
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How bout a weak coil?? The reason i ask i i can put the "fouled" plug into a different cyclinder, then that plug is just fine and fouls a different new one...


I am thinking about testing my Mag side coil to see if its out of spec...
 
Before these troubles, my jetting was spot on. ran 1500 ish miles last year, didnt foul 1 plug. This year (same temps) and ive been fouling plugs. Ive got the sled melting off, eating some chilli, and will go out and check coil specs... I see there is a primary and a secondary coil spec.... Whats the deal here and how do i test each? I have a pretty decent Fluke multimemter so i can check ohmage...
 
Tested the coils... Here's the specs


Mag Side (one i was fouling)

Cap 5.06kOhm
Primary Circuit .8 Ohm
Secondary Circuit 6.34 kOhm

Center

Cap 5.17 kOhm
Primary .5-.6 Ohm (meter varied b/c only had 200ohm setting)
Secondary 6.33kOhm

PTO

Cap 4.56 kOhm
Primary .5-.6 Ohm (meter varied b/c only had 200ohm setting)
Secondary 6.17 kOhm


So what yalll think? I have an opinion, but figured i'd let the more knowledgeable speak first. :) :letitsnow
 
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