Author Topic: 74 CB 550F Which plug wire to which cylinder  (Read 940 times)

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Offline breezy

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74 CB 550F Which plug wire to which cylinder
« on: July 24, 2011, 11:07:17 AM »
I couldn't seem to find a plug wire diagram or a cylinder number diagram online.  How are the cylinders numbered- right to left or left to right while seated on the bike?  I'm not sure that the bike had the right plug wires to the right plugs when I got it.  It had been sitting for a number of years and 3 of the plug caps were off the plugs.  I made a guess just going on the length of the plug wires, but Murphy was probably helping me guess wrong.  Is there a diagram that shows which coil lead goes to which cylinder?

I also noticed that the spark itself, tests out as really fat and strong but is an orange color and doesn't make a sharp snap sound, different that the crackling blue spark I'm used to seeing.  Is that due to the NGK 5k resistor plug caps?

Offline Bankerdanny

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Re: 74 CB 550F Which plug wire to which cylinder
« Reply #1 on: July 24, 2011, 11:11:24 AM »
1 to 4 left to right seated on the bike
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Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline Bankerdanny

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Re: 74 CB 550F Which plug wire to which cylinder
« Reply #2 on: July 24, 2011, 11:29:11 AM »
I just took a quick look at my bike, the left coil is 2-3 and the right coil is 1-4
"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200