Question about Honda CB 750 Motorcycles

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I have a 1974 cb750 and one day i was riding and it back fired really loud then lost allmost all power so i replaced the coils and ignition and still no power and it has never blowen blue smoke any thoughts to what it might be

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Sounds like you had an exhaust valve tighten up, check them at TDC top dead center by removing the alternator cover derby, put the bike in neutral, turn the flywheel in correct direction (arrow on it) until the TDC marks for 1 and 3 are aligned, check ex valves .003" or if you can barely feel them move is how I adjust them. :) If you lose compression or fire on a cylinder it becomes an oil syphon that will cause blue smoke and backfire as you had. It could also be a set of points closed up or a bad capacitor on the points. Intake valves are .002" .

Posted on Oct 08, 2009

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Firing order on cb750 1974 honda


left coil feeds 1 and 4...right coil feeds 2 and 3...as long as you stick to this it doesn't matter which lead goes to which plug. Left coil will have one short lead and one long...short =1...long = 4. Right coil leads will be about even in length...doesn't matter which goes to 2 or 3.
It's a wasted spark system so plugs 1 and 4 fire together...2 and 3 fire together...only 1 cylinder in each pair will be compressed and ready to fire when the spark happens, the other will be empty and coming on to it's inlet stroke...

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Firing order 3 6


1-4 fire off one coil 2-3 fire off the other coil

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Have a 1963 ford falcon with a 1974 302 from a Granada in it. I can't get it started, no spark at the plugs. It was starting just fine and then one day nothing. I have replaced the coil, starter s


The Pertronix system can be troublesome.
Put back the points and try again.
Please check for voltage at the coil POSITIVE side.10 V. is OK.
My system took a dump in the rain.
The solenoid has nothing to do with not running.
You will be fine.

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1 Answer

1974 honda 550 four will not start no fire to the plugs


Make sure you have a fully charged battery. The ignition system on a Honda draws it's power from the battery not the charge coils. Start by replacing your points and condenser. You probably have shorted or grounded points which translate to no spark at the plug. New spark plugs and spark plug caps (caps unscrew off of the end of the wire) will also increase the efficiency of the spark.

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I have a John Deere riding mower Model RX75 which will not start, I replaced the spark plug and it ran just fine for one day except that it Back-fired when I shut it off it never did this in all the years...


Weak spark can be caused by a bad ignition coil. The ignition coil is located under the engine fan/shroud, next to the flywheel. Check to make sure the coil lead and plug cap are not grounding against the engine robbing your spark as well.

Aug 03, 2011 | John Deere Garden

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I have a 1974 CB750 Honda and I have owned it since 1975. It has run well over the years. I went to start it the other day and when I hit the start button, I lost power and the bike is dead. No lights,...


If you lost all electrics, it may be in the battery cables, check where it grounds to the frame and the engine, and check continuity of the cables themselves in case they have corroded or broken under the insulation.
.you said the main fuse is ok but does it have power to it? use a test light to check both side of fuse for power

Mar 20, 2011 | Honda CB 750 Motorcycles

1 Answer

1994 suzuki 1400 inturder fires on one side both coils are good could cdi be bad on one side also there is power on both sides.


The same problem with my intruder. Make sure the battery is good. I mean really good. Good amps and voltage. I replaced mine and haven't had a problem since. Also make sure that the plug gap is right on both plugs. Replace and gap the plugs if need be. Check to make sure that the plug wires at the plugs are inserted as they should be . A lot of times when you pull the plug wires from the plugs they come loose. They screw onto the insulator. One day I was riding and lost power to one cylinder and reached down and grabbed the plug wire and got a jolt. I screwed the plug insulator back on and off I went. Make sure that the plug wires arn't grounding out to the frame at any point. If so replace the plug wires. This was another problem I found. Good luck and Ride Safe. David.

Nov 13, 2009 | 1994 Suzuki VS 1400 Intruder

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