Author Topic: Confused about which sparkplug coil fire which cylinder  (Read 1861 times)

0 Members and 1 Guest are viewing this topic.

Offline kingjess25

  • Full Member
  • *
  • Posts: 32
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

Offline LesterPiglet

  • Old Timer
  • ******
  • Posts: 4,046
  • 1977 CB550F2
Re: Confused about which sparkplug coil fire which cylinder
« Reply #1 on: April 13, 2014, 05:49:19 PM »
left to right(1 2 3 4)? My bike is a 1975 cb750
Yes.
'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

Offline kingjess25

  • Full Member
  • *
  • Posts: 32
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?

Offline TwoTired

  • Really Old Timer ...
  • *******
  • Posts: 21,805
Re: Confused about which sparkplug coil fire which cylinder
« Reply #3 on: April 13, 2014, 06:42:22 PM »
Left to right, looking above the engine right?

Yes, as seated on the bike.
Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 14,800
  • Northern Virginia
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
Prokop
_______________
Pure Gas - find ethanol free gas station near you

I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
Sidecar


CB900C

2006 KLR650