can't get spark

[bfear]

hello everyone,

I am new to this forum an new to cb 750s.

Mine is a 1976, i bought it from a guy that had it for about a year in his garage and he did some stuff to it but never got it running.

i got all electeric hooked up but still can't get spark. I have power going to coils and to points and condensers.

does anyone know what i could possibly do to get it to fire?

thanks ben from ohio

[Re-run]

How do you know you are not getting a spark? Unles you take out the plug and lay it on the head just right so it grounds, you would not really know.
Start at the bottom, the points. Make sure the timing and gap are right. If the points are not opening, nothing will happen. Make sure all wire connections are good. On the plug leads, unscrew the plug caps and snip about 1/4inch of wire off, test the plug caps for resistance, they should be about 5K ohms. Put the cap back on. Check the plugs, are you sure they are good? I doubt 4 would die at once but if they are really old, it would be beneficial to get new ones. The 76 uses D8EA DO NOT get DR8EA as those are resistor plugs and while they can work, they will not work as good. Now remember when I said check the wiring, that meant the kill switch too. Make sure it is working. Turn everything on and pull the plugs out. You do not need gas, just a well charged battery, you did check that too right? A dead battery will not get anything going.

Hit the starter in a dim room and watch for spark, do this on all 4. Spark should be blue, the stronger the better. If it is orange, then there is something wrong.

[bfear]

i have checked all that stuff and i have tested power to the coils with a test light and it s there. And when it wouldn't start the first thing i did was pull the plug and ground it to see if there is anything. Nothing. i have ower going to the points also. they are moving too.

as far as ohms go i have no way of testing ohms and the mechanic down the street said that coils hardly ever test the correct ohms anyway so that is not really a good way to see if they are good or bad.

[sockeye]

On the chance that you have been checking just one spark plug, your wires may be old and rotten - not all probably, just the one(s) you're testing.  If they've been replaced. it could have been with the more common, smaller diameter, which may not have been installed securely (into coil connecters).  Anything, of course, is the possible culprit.
In any case, it's always a good idea to replace ignition wiring on a classic with no certifiable shop record.  These should be appropriate plug wires for your 750;
********
WIRE, IGNITION .
30750-MA6-P00  (replaces 30754-425-010)
********
PS:  When I purchased my 750F it didn't spark and owner claimed he went through everything.  Turned out, he did.  He even showed me the receipt for the new rectifier/regulator, stator, and rotor (alternator).  I tested everything except the rectifier as it was beyond my skills.  As last resort, purchased old, grease-ridden rectifier just for laughs, slapped it in there, and low and behold, it got the 750F running faster than a scared dog.
Lesson to me - Just because it's a new part, doesn't mean it's beyond reproach.

[Polymer-2]

If you have power to the coil then remove the cover to the points and try cleaning them with a piece of sandpaper. If that doesn't work see if there is power to the points when they are open and no power when they are closed. Check both sets.
No power with them open = corroded connection or open wire. Power with them closed = corroded contacts or bad ground at the points or point plate.