78 honda z50a k-3 no spark

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gdk10

Member
I'll check those insulators, I have pulled the engine and sanded all points of contact for ground. I have not even hooked up any other wiring yet to help minimize problems until I get the engine running. thanks...
 
G

gdk10

Member
cjpayne said:
Both. Very few windings-low output. Weak magnets-low output.
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It is possible, i guess, that two rotors could not only be weak but evenly weak to put out the same 2 volts. you wouldn't happen to have a for sure good one you let me borrow to find out?
 
cjpayne

cjpayne

Well-Known Member
gdk10 said:
It is possible, i guess, that two rotors could not only be weak but evenly weak to put out the same 2 volts. you wouldn't happen to have a for sure good one you let me borrow to find out?
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Your stator windings look that they have plenty. I dont think I have a spare rotor thats in decent shape. Take a small nut and put it up to the magnets(should be 4) and test them. They should have a decent "stick" and be even with each other. Check for any impact damage( hammer head, being dropped, ect.).

BTW, I would go ahead and install the motor into the frame to make sure that you do have a decent ground and install a jumper wire.
 
kirrbby

kirrbby

Well-Known Member
Do you have a link to the coil(s) that you bought. It looks like it's mounted with one bolt...i.e. not made for your bike. There are a lot of vendors...eBay...that misrepresent parts. We've had folks who got 12v coils...advertised to work on 6v models.
 
G

gdk10

Member
Yes, I have done a lot of searching for parts and info and there is more bs than facts. I am fairly confident in both coils I have bought and have tested both with a 6volt battery to assure they fire the plug. the rotor is strong enough to hold all the screws for the stators, the nut and washer for the rotor, a pocket screw driver as well as a few other screws and nuts with no problem. It also sucks itself on and takes a good grip to remove it after loosening it from the shaft. Maybe I should have worded that different but , i am strictly speaking mechanics...
Again everything tests to be working as it should, i am just not getting enough voltage from the stators to excite the plug coil enough to fire the plug.
 
cjpayne

cjpayne

Well-Known Member
OK. If all else fails, I do have a K1(Frankenstein) motor. Until I check thoroughly, it has a full stator, good flywheel, and was working fully(everything is OEM), but I could pull those out and send to you. I hate to do that just for a diagnostic purpose.......but I'm willing. PM'd
 
Gary

Gary

Well-Known Member
You mention you only get 2 volts ac out but only the lighting side would be ac wouldn't it? Is the ignition coil side dc? I once wound a lighting coil but other than that I've never messed with the ignition side. Just throwing that out there.
 
G

gdk10

Member
Gary said:
You mention you only get 2 volts ac out but only the lighting side would be ac wouldn't it? Is the ignition coil side dc? I once wound a lighting coil but other than that I've never messed with the ignition side. Just throwing that out there.
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hey, Form my understanding it is pulsing dc so hard to get a decent reading from but would be equal to ac which reads better. both coils out put the the same form I think the lights are a little larger for more juice. I could be wrong, but it seems to hold true with my testing...Thank for the input
 
G

gdk10

Member
cjpayne said:
Do me a favor first. install that motor into the frame and then test EVERYTHING, then call me.....okay?
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Hey cj, Thanks for the thought but I would hate for you to do that also. Although If I don't come up with something I may just bring it your house and leave...lol
The motor is installed and I have pulled it again just to sand and make sure all grounding points are good. I have just changed out the whole ignition system again just in case and still no change. I quit trying to get fire last week and have just focused on getting more than 2 volts from the stator. I will try some in the morn to get fire from the plug and let you know. I really appreciate the help
 
G

gdk10

Member
all righty then, the latest is I have removed the condenser from both sets of stators and have tested just the output of the ignition coil and by itself i only get 4 volts, tested from both ignition coils. I believe that must mean that my rotors/magnetos are weak. So I am in the market for a "good strong" rotor.
 
Gary

Gary

Well-Known Member
It's going to be something unusual and changing flywheels/finding them is easy on these but I have to say in my 50+ years of messing with bikes I have only seen that once. It was on my Triumph,a basket case to begin with being around 10 years old. Obviously pre internet days-parts being hard to come by ended up finding someone to remagnetize it. This is like a murder mystery it will be interesting to find out what's going on!
 
G

gdk10

Member
Thanks Gary, by the way my name also. exactly what I thought, two rotors that do the exact same thing would have to be millions to one. But by checking the output of just the ignition stator coil, isolated from everything else, two different ones, they both only put out 4 volts. I feel like I am in an alternative universe where things don't work like they are supposed to. Do not know what else to do or check.
 
G

gdk10

Member
Well that was a bust, don't try that all it did was make a paper weight out of it. Now it has NO magnetism.
Back to the drawing board. I can not find a nos or any other quality rotor anywhere. What about the cdi conversions? Or is that for battery only?
 
cjpayne

cjpayne

Well-Known Member
gdk10 said:
Well that was a bust, don't try that all it did was make a paper weight out of it. Now it has NO magnetism.
Back to the drawing board. I can not find a nos or any other quality rotor anywhere. What about the cdi conversions? Or is that for battery only?
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I had a '05 CRF70 with CDI and no battery.
 
L

lukelaw1

Active Member
Gary said:
You mention you only get 2 volts ac out but only the lighting side would be ac wouldn't it? Is the ignition coil side dc? I once wound a lighting coil but other than that I've never messed with the ignition side. Just throwing that out there.
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Both should output ac voltage
 
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