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Author Topic: Confused about which sparkplug coil fire which cylinder  (Read 1885 times)

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Offline kingjess25

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Confused about which sparkplug coil fire which cylinder
« on: April 13, 2014, 05:36:37 PM »
Hi all,
 
My sparkplug wires are numbered. Each terminal has 1,4 and 2,3. Do the numbers represent which cylinder to fire? Do I just put them from left to right(1 2 3 4)? My bike is a 1975 cb750
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Offline LesterPiglet

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Re: Confused about which sparkplug coil fire which cylinder
« Reply #1 on: April 13, 2014, 05:49:19 PM »
Quote from: kingjess25 on April 13, 2014, 05:36:37 PM
left to right(1 2 3 4)? My bike is a 1975 cb750
Yes.
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Offline kingjess25

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Re: Confused about which sparkplug coil fire which cylinder
« Reply #2 on: April 13, 2014, 05:55:47 PM »
Left to right, looking above the engine right?
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Offline TwoTired

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Re: Confused about which sparkplug coil fire which cylinder
« Reply #3 on: April 13, 2014, 06:42:22 PM »
Quote from: kingjess25 on April 13, 2014, 05:55:47 PM
Left to right, looking above the engine right?

Yes, as seated on the bike.
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Offline 70CB750

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Re: Confused about which sparkplug coil fire which cylinder
« Reply #4 on: April 14, 2014, 05:43:00 AM »
The coil fires two sparks every time, but only one piston in the pair is in position to use the spark.  That said, you can swap 1 and 4 spark plug cables  and also 2 and 3 spark plug cables.  It helps with trouble shooting and such.

More here:

http://en.wikipedia.org/wiki/Wasted_spark
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