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Author Topic: Changing Plugs?  (Read 2288 times)

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Gecko

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Changing Plugs?
« on: November 05, 2007, 10:28:13 AM »
I was reading an artical on BMW's latest wonder engine (car) and how it uses an ion-sensing system to detect detonation for spark timing.  It also mentioned that HD uses the same system on the new bikes.  I knew that, but it got me wondering - is there something different with the plugs on these since it is also acts as the sensor?  That is, if you switch to a different plug is it possible to screw up the spark retard? 
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SE08RK

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Re: Changing Plugs?
« Reply #1 on: November 05, 2007, 11:33:49 AM »
As long as you use the recommended resistor type plug and the gap is correct - not a problem

BC
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rednectum

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Re: Changing Plugs?
« Reply #2 on: November 05, 2007, 01:14:47 PM »
yep, it senses resistance in the secondary ignition side, aftermarket wires will trick the ionic sensor as well.

i use autolites as replacement for oem champions with no ill effect.
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