[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Spark Plugs; report on BKR 7 EIX (8)
- Subject: Re: Spark Plugs; report on BKR 7 EIX (8)
- From: "Steve Makohin" <wateredg@xxxxxxxxxxxx>
- Date: Wed, 8 Jun 2005 16:09:26 -0400
Ben Barkow wrote <dr.ben@xxxxxxxxx>
> Multiple-electrode spark plugs...I'd recommend the Autolite
> plugs or maybe the trick platinums or iridiums. But for sure,
> not multi-electrode plugs.
I am NOT a mechanic nor an engine tuner. The following info was conveyed to
me by someone who is a mechanic, and more importantly, who is a skilled
engine tuner (John Parker of Budd's BMW, and of John Parker Racing fame).
When my '00 and '01 R1100S surged, John explained the following to me:
o Oilheads are tuned to run lean
o A centralized spark in *logically* the ideal location
o Similar issues have been noted in the F series (surging, rough running)
o In many cases, proper tuning will resolve the issue, but it will
return as the bike goes out of tune.
o He has had great success with non-stock spark plugs, specifically...
o Spark plugs with a projected tip place the ignition source a little
deeper into the cylinder, and in many cases, this little difference
can make all the difference in the world.
o Additionally, Parker experimented with heat ranges and found...
o There is no "magic bullet" for Oilheads surging and rough running.
Different models may behave differently, and a solution that works
for one bike, may not work that well for an apparent twin (same
model, same year) because of a host of minor variations (such as
an 02 sensor sending a signal that's a few milivolts off from its
"twin", etc) that add up to a significant difference.
o If you're patient, resourceful, skilled, and you have time on
your hands, then by all means, experiment and have fun. But for guys
like me, John Parker's "fix" for my bike was well worth it. I believe
it was something like CAD$130 for the labor, leaving the bike
with him for the day to experiment with it, and CAD$9 for the
two spark plugs (cheaper than BMW parts).
- -Steve Makohin
Oakville, Ontario, Canada