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Old 07-09-2002, 09:20 PM   #1
Scooby Newbie
Member#: 18531
Join Date: May 2002
Location: Central Wisconsin, USA
2000 Outback LTD

Default Spark Plug mod: clipping the electrode

Well, hell, this idea of mine has been ignored everywhere
else I posted it, so I'll give you people a chance, too!

I've been using this mod in all my engines since 1975.
I came up with it when trying to eliminate a bad missfire
in a heavily modified Yamaha RD 350 two-stroke bike.

The idea is to provide a sharp-edged conductor (which
helps the spark to jump the gap, along with un-masking
the spark, so the flame-front can grow outwards more

I simply cut the side electrode with a side-cutter, so
the resulting tip is even with the -edge- of the center
electrode. I file off any burrs, then gap around .040.

I've never had a problem with the gap being too large
(I've gone as large as .050) and plug life is "adequate".
(I've got 50,000 miles on the plugs in my subie, and
won't be replacing them any time soon.) I've not had
ANY misfire with the large gap...

In other applications, I've noticed much faster starting
in very cold weather, with much better cold idle, much
better throttle response, and seemingly better mileage.

I've highlighted the electrode in these pics, since it
didn't show up well otherwise. I hope you get the

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Old 07-09-2002, 10:03 PM   #2
Scooby Guru
Member#: 4800
Join Date: Mar 2001
Chapter/Region: TXIC
Location: Houston, Tx
1990 Legacy & 97 OBS


What did you use to cut the electrode? Just a normal cutters?
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