elcamino12sec
Member
- Jan 16, 2006
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For my 2005 kx250 the Factory manual says the NGK plug is a br8ecm, its about 15.00, is a b8es alright to use because there like 2.50. Having two extra plugs in the truck for 5.00 is better than 30.00.
Lower cost alternative?
- Thread starter elcamino12sec
- Start date
- Nov 25, 1999
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- 43
I don't remember what all of the different letters mean on the br8ecm but here is my recommendation. Buy several (3-4) b8es plugs and jet your bike as clean as you can. Once your jetting is dialed in, put in the br8ecm and keep the b8es's for spares. Most likely, once the jetting is dialed in, you won't need the others except when a buddy fouls a plug.
elcamino12sec
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- Jan 16, 2006
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- Thread starter
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- #4
I have never fouled a plug in it, I just like to have a couple just incase, you know? I have been carying the b8es in my trail bag when I go riding as a spare, in the event I need to use it I dont want to hurt the motor, I have only had the bike a month or so.
You can use a BR8es, but not a B8es. The R is important as it's stands for resistor. It should be about the same price as the B8es anyway.
B is for the head(where you attach the spanner) and thread size = 21mm spanner to remove plug
R = resistor
8 = heat range
ES/ecm etc is the type of tip
I'm guessing the ecm plug has a fine tip where es stands for standard tip and it is fat.
If I were you I would buy the BR8es plugs. I've used them in bikes for years with no problem, in fact I think they are more foul resistant than the expensive ones.
B is for the head(where you attach the spanner) and thread size = 21mm spanner to remove plug
R = resistor
8 = heat range
ES/ecm etc is the type of tip
I'm guessing the ecm plug has a fine tip where es stands for standard tip and it is fat.
If I were you I would buy the BR8es plugs. I've used them in bikes for years with no problem, in fact I think they are more foul resistant than the expensive ones.
2 strokes for life
Member
- Jan 3, 2007
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At my dealer i am getting the BR9ES for only $7. The BR8ES will also work it is just a better plug because the tip is shorter.
Did you know the resistor just means your ignition wont put out rf interference on someones tv or radio.Its just so you wont annoy someone around where you ride.It doesnt make any difference to your bike besides the one without the resistor probably will deliver more of the energy to your plug.In the older bikes b8es was used in trail bike types and the b8egv went in the cr rm yz kx race bikes.It has a smaller conductor down the center for less voltage required to fire.The less resistance the more energy gets turned into spark.I think the electrode is cut to expose the spark to the mixture more on the egv to.Check them out for a cheaper premium plug
Pete Payne
MX-Tech Suspension Agent
- Nov 3, 2000
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Go with a BR8EG . Will work great.
cr125freak
Member
- Jul 11, 2005
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I have heard that a with out a resistor you can possibly risk other electronics on the bike. HEARD POSSIBLY are key words. I would go with the Br but a different shop to buy it from
B indicates a 14mm thread diameter
R means there is a resistor
8 is the heat range
E is a 19mm thread reach
CM says that is is a "Compact type, low angle ground electrode"
S would be the "standard 2.5mm center electrode
G is a "Fine wire nickel alloy center electrode"
I run the B8ES or EG in my 2004 KX250, and an not skilled enough to identify any performance difference between the two. Of course, you need to check to see if the engine was altered in a way that reduced the piston/head clearance for 05. Based on the description, your piston may contact the electrode if you switch. I don't know if it exists, but you could try to find a BR8HS which would have a 12.7mm thread reach. I cannot claim that the engine would run well with the electrode pull that far up, it could easily end up in the plug hole. If you do try the ES or EG, you should install it and kick it over gently with the plug cable disconnected, then take a look at the plug to see if it has been damaged. You could also try adding a copper washer under the plug to keep it from installing so deep.
The best way to make the decision might be to take a look at both plugs (or all three), side by side, and see exactly how different they are.
Edit: I think that I forgot to mention that experimenting with non-recommended plugs is AT YOUR OWN RISK!
R means there is a resistor
8 is the heat range
E is a 19mm thread reach
CM says that is is a "Compact type, low angle ground electrode"
S would be the "standard 2.5mm center electrode
G is a "Fine wire nickel alloy center electrode"
I run the B8ES or EG in my 2004 KX250, and an not skilled enough to identify any performance difference between the two. Of course, you need to check to see if the engine was altered in a way that reduced the piston/head clearance for 05. Based on the description, your piston may contact the electrode if you switch. I don't know if it exists, but you could try to find a BR8HS which would have a 12.7mm thread reach. I cannot claim that the engine would run well with the electrode pull that far up, it could easily end up in the plug hole. If you do try the ES or EG, you should install it and kick it over gently with the plug cable disconnected, then take a look at the plug to see if it has been damaged. You could also try adding a copper washer under the plug to keep it from installing so deep.
The best way to make the decision might be to take a look at both plugs (or all three), side by side, and see exactly how different they are.
Edit: I think that I forgot to mention that experimenting with non-recommended plugs is AT YOUR OWN RISK!
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Oh, and the resistor reduces the Electromagnetic Interference that can cause problems with ANY nearby electronic device. This includes a CDI box. This is the whistling sound that is often heard on a poorly installed car stereo. But the interference from a single cylinder engine would likely not be enough to be an issue with TV or radio that isn't attached to the bike.
I'm not so sure that's accurate. The higher energy in todays CDI units need the resistor. The CDI itself is susceptible to RFI. You probably won't notice until upper RPM's but it does make a difference. I had a '99 YZ250 that missed terribly if I ran a B8ES instead of the BR8ES.