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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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Old 12-13-2008, 10:34 PM
Grampy Grampy is offline
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Question EC 250 Spark plug

The manual that came with my Gas Gas 250EC calls for a NGK BR8EG which is a resistor plug. The NGK book at my dealership calls for a B8EG non resistor plug. Any problem with running a non resistor plug? Have heard concerns about non resistor plugs harming CDI units.

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Old 12-13-2008, 11:50 PM
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widebear widebear is offline
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Just put in a resistor plug. Their main purpose is to cut down on rf noise that can interfere with radio and other forms of communication and sensitive electronic transmissions and data aquasision.
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Old 12-14-2008, 11:02 AM
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Like widebear mentioned, use a resistor plug. I have used both BR8EG and BR8ES plugs. The G plug has a fine wire nickel alloy electrode, the S plug has a standard 2.5mm electrode.
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Old 12-14-2008, 02:57 PM
Grampy Grampy is offline
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Quote:
Originally Posted by MattR View Post
Like widebear mentioned, use a resistor plug. I have used both BR8EG and BR8ES plugs. The G plug has a fine wire nickel alloy electrode, the S plug has a standard 2.5mm electrode.
Which worked better, the BR8EG or the BR8ES?
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Old 12-14-2008, 03:10 PM
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I fouled a plug once at high elevation and put in a B8ES which I had as a spare. I forgot about it, and ran it for about a year before I did the squish band mod on my head and found it. I laughed at myself as I took it out.

My experience is that it doesn't matter a bit which plug you run. The expensive electrode is a waste of money. I would still choose a resistor just in case there were interference issues, but I certainly didn't have any with the non resistor plug.
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Old 12-14-2008, 05:45 PM
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Quote:
Originally Posted by Grampy View Post
Which worked better, the BR8EG or the BR8ES?
I had same results as roostafish. I could not tell a difference between EG vs. ES. It probably depends on how well your jetting is dialed-in. I found BR8ES easier to find so I just run those in my bike.

FYI... there is also an iridium plug that may be interesting to try out. In my Husky SM610, this plug is a well known trick to eliminating some rich hesistation at 4000 rpms. The iridium plugs are pricey at $10 each. The iridium plugs provide a stronger, more consistent spark for a cleaner burn.

Here is more info:
http://www.ngksparkplugs.com/product...x.asp?mode=nml

I usually replace my spark plug yearly for piece of mind. So I will probably throw one of the iridium plugs in to try out. The GasGas EC250 would use a BR8EIX iridium plug (where IX is the callout instead of EG or ES).
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Old 12-14-2008, 06:31 PM
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I highly recomend a BR8EIX. Its a great pulg and wont foul. I was running a 185M jet, 48 pilot, and AS 1 turn out durring break in and then swapped out to a 175M, 42 pilot, and 1.5 turns out. Saying the least I was running rich and it still never fouled. Best under $10 spent ever.
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Old 12-14-2008, 08:44 PM
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Do yourself a favor and drop the "R" resistor plug. I did on both my bikes and have never been happier. No cdi interferance. The resistor is designed to "resist", ie: more current to make a spark and at the same time also reduces radio interferance which can affect some electronic ignitions and especially transmitted frequencies (am/fm/television). If everything is working fine that's great, actually it's excellent. If you get to the point it is taking too much current (running rich from a tipover or a long downhill on a cold day) it can burn out the resistor.
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Old 12-15-2008, 07:11 AM
joey11 joey11 is offline
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I've ran both ES and EG plugs, but now that I run an ICO, I've been using the one with a resistor. Should I not worry about that and run a B8es? Will the computer be OK?
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Old 12-15-2008, 08:58 AM
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+3 on the Iridium plug.

I've used them for years on my KTM and will also use one on my new to me 07 EC300. Never fouled one and I believe it helps the bike start easier. Change it out once a year for piece of mind.
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