Ignition system on '77 kz650

Yes, so true. I'm so fedup I'm ready to throw in the tower. I'm trying to get this bike ready so the whole family can go riding together. My youngest boy is suppose to ride it but now he does not trust it. I'll do the ohms and voltage checks on the coils again. Go over the plugs, swap ignition modules, etc and especially the connections and conditions of the wires. I still am going to have all Dyna coils and ignition modules for the very last time. I mean I really appreciate you guys helping but due to a lack of skills here and $$$........ , you guys may be frustrated too. If I get this right this time then I'll do the wiring upgrade as I really like that idea as well.

Question on the timing with the Dyna s ignition module. The instruction says timing using a light is to the advance mark that is approx 1/2 inch to the right of the F marks against the mark on the engine case. Is that right?

eaglecrash2 wrote:

Question on the timing with the Dyna s ignition module. The instruction says timing using a light is to the advance mark that is approx 1/2 inch to the right of the F marks against the mark on the engine case. Is that right?

On the advancer, there is one T mark and one F mark for cylinders 1/4, and one T mark and one F mark for cylinders 2/3.

The marks are close together and look like T||F. Or maybe T|F|.

The letter "T" and the letter "F" are just to show which of the || marks is which. The left-most | is the T mark, and the right-most | is the F mark.

As the crankshaft turns, the F mark (the right-most |) passes the permanent engine case mark before the T mark (the left-most |).

The Dyna-S instructions are confusing. Using Dyna-S, I have always aligned the F mark with the case mark at idle rpm (same as with points) and it's perfect. The cylinder is supposed to fire at idle rpm when the F mark aligns with the engine case mark, and this applies whether using points or electronic ignition.

Good Luck!

Thanks! I did that the first time around i.e. F mark line up with the engine side mark. This last time I read the Dyna instructions and got confused. Following this the engine actually back fired thru the exhaust. I'll redo it next week. Ran out of time and patience today. Thanks again.

Any chance the 14 and 23 coil feed wires are reversed, or the cam on the end of the crank (Dyna cam) is on 180 degrees off?
Try switching the coil feed wires (the green and black). If the cam is 180* off on the Dyna, the timming will be way off.
If switching the wires does not help, switch em back.

rick,when I put my dyna on the 650 , the wires were reversed, just as soon as I tried to start it I knew the all famous back fire, changed the wires around and off she goes.

as I did a quick read of the issue, the bike was running fine and then devleoped a rough idle,

is there a chance that this may be a carb / air leak issue rather than a ignition?

A single magnet is embedded in the Dyna-S rotor. The magnet is about the same size as the top of a pencil eraser.

One of the two coils fires the outside sparkplugs #1/4.
The other coil fires the inside sparkplugs #2/3.

Whichever coil fires #1/4 is supposed to receive its signal from the left-side Dyna-S module as the rotor magnet passes by the left-side Dyna-S module.

Whichever coil fires #2/3 is supposed to receive its signal from the right-side Dyna-S module as the same rotor magnet passes by the right-side Dyna-S module.

The signal wire from each module should be color-coded to show which coil it goes to. In other words, the wire from the left-hand module connects to whichever coil fires #1/4; and the wire from the right-hand module connects to whichever coil fires #2/3.

Be sure the F mark for #1/4 aligns with the engine case timing mark as the rotor magnet passes by the left-hand module.

Good Luck!

rstnick wrote:

Any chance the 14 and 23 coil feed wires are reversed, or the cam on the end of the crank (Dyna cam) is on 180 degrees off?
Try switching the coil feed wires (the green and black). If the cam is 180* off on the Dyna, the timming will be way off.
If switching the wires does not help, switch em back.

I matched up the wires color coding on the coils. What's the Dyna cam? Sorry, I don't get this one.

Yes, I need to do this one. Have been drinking too much after work. My head is not quite there! No, this bike didn't drive me to drink, it's the season...good excuse. ha

Hey, bike is running fine. Redid the timing but before that I soldered all wiring connections. I read in another thread about checking the timing with a strobe light. Is that necessary? Thanks folks!

eaglecrash2 wrote:

Hey, bike is running fine. Redid the timing but before that I soldered all wiring connections. I read in another thread about checking the timing with a strobe light. Is that necessary? Thanks folks!

Dymanic timing (engine running) is more accurate than static timing (engine not running). Static method should get timing close enough for the engine to crank up and run.

Dynamic method also allows seeing the advancer in action moving back and forth as the rpm's are varied.

So now the Dyna-S "cam" mystery has been solved. :laugh:

Glad to hear it's running fine.

Good Luck!

Thanks Patton, With a strobe light what rpm should I use? I don't see it in the Kawasaki shop manual.