Maintenance & Technical > KX250 / KX125
Spark plug question
Plowboy:
Every resource I have at my disposal calls for an R6254E-9 NGK plug for my '92 KX250. The bike came to me with a B8ES in it, and although it's running on the B8ES, am I missing(hurting) something by using the cheaper plug?
Why does the '92-'93 call for the more expensive plug?
dmstarr:
If the bike runs good with no overheating, and the plug looks good you should be fine. I don't have a cross reference handy, but I know most of the 90's model KXs came with a B8ES plugs.
FWIW, the minis call for a 105 racing plug, and I always use BR9ES.
Plowboy:
Everything seems to be okay with the B8ES that's in it, so I don't see any point paying 3+times as much for the special plug myself.
The 6254 looks very different on NGK's website though. Here's a pic.
FuriouSly:
--- Quote ---Everything seems to be okay with the B8ES that's in it, so I don't see any point paying 3+times as much for the special plug myself. The 6254 looks very different on NGK's website though. Here's a pic.
--- End quote ---
The 6254 has a fine wire electrode, much thinner that the ES. ES standard plug is "old" tech....
R6254E-9 = Racing plug, 14mm, 3/4" reach, 13/16" hex, gasket seat, non-resistor, nickel alloy fine wire center and ground electrodes, solid terminal, .060" gap
BR9EG = Racing plug, 14mm, 3/4" reach, 13/16" hex, gasket seat, resistor, fine wire(1.3mm) nickel center electrode, traditional ground electrode, solid terminal
6254 is a nice plug, very specific. Non Resistor plug with a specific gap of .060"..... interesting. Has a nickel alloy ground prong too..... nice!
Other than that they are the same spec on size and temp....
Sly
Plowboy:
I wonder if I should increase the plug gap on the plug I'm using since the 6254 is .060 and I'm only at .024? Maybe I am missing something in the way of a larger spark/flame "kernel".....but then again with the B8 standard plug more of the spark/flame is exposed than with the 6254.
Very interesting.
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