1981 CT110 with points how many volts needed from stator

D

dostrem

Member
I’m still having trouble with no spark. Wiring checks out. Points cleaned, gap and timing set. Condenser checks out at .24 uf. Coil ohms as expected. Several coils tried, several new spark plugs. The only thing I can find is that I’m only getting 8 v AC OUT OF THR B/W wire from the stator. Online im seeing expected stator volts on this bike at 35-50 v AC. I’ve torn apart the stator and test all the coils for continuity and even tried another stator from an identical bike,
Any ideas about minimum v required out of stator ? (Battery at 6.3 v.)
 
dostrem said:
Did that. Also checked volts in at coil- max 6volts ac/ no spark.
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May or may not be relevant to your situation, but previously in a wring harness swapI reconnected the coil ground to some ground other than the points. Chased it for a long time then the local lawn mower shop found it quickly. It’s funny now.
 
Thanks I’ll check out the grounding. I put another stator in from a different year with 5 edited instead of 3. It cranks out 45 v on kickstart- still no spark !!! Confusing!!
 
Saying that you swapped the stator with another one and still no spark leads me to believe that perhaps that is not the issue at all. And as I stated in your other thread, I have NEVER seen a CT110 stator go bad. i have seen flywheels become demagnitized, but that was only once.

If you have not already done so you should replace the capacitor and check the connection at the points to make sure the little insulating o rings are in place correctly. obvviously grounds are also important. While you are at it use a known good working 6v coil.

If your stator is bad it is most likely a connection point as I don't see any way the windings really get messed up. if you are convinced it's the stator, send it out to Ricky Stator to rewind or buy yourself some wire and wrap. I will tell you this though, I have wrapped trx90 coils on a few occasions and the subsquent week of hand cramping was not worth the money i saved, although those stators did work great.
 
I agree the experience with a second stator sure makes it look like it’s not a stator problem. I just sent it to Rick to have it checked out. I’ve used several new condensers from DrATV, also measured the capacitance and the charging/discharging function. I’ve tried several different coils including 3 new ones “guaranteed to be for this CT110, but I can’t tell whether they are truly 6 volt AC. I’m thinking of Rick says the stator is ok, then I must have some sort of wiring or grounding issue.
 
well, back to the other point...if the stator is fine, and you jumped the black wire from stator directly to the coil it won't be a wiring issue. It will be a coil, condensor or points issue.
 
I can’t seem to find a consistent value for the ignition stator output voltage on kickstart. I’ve seen as low as 6vac and as high as 50. Mind puts out 9vac and I am getting no spark. Condenser and points check out fine, as do grounds.
 
I’m not an electrician but I’ve been down what seems to me a very similar road and over the time period of several months that it took to solve the problem I came to several conclusions about the way I handled it. I was troubleshooting and checking the same items over and over and got the same results; stator, points, condensers, coils all good. Then I quit checking for volts and instead checked each wire for continuity and, more importantly, I then checked each wire for resistance. All good. Painfully I disconnected the new wiring harness and reconnected with the schematic and my notes and zip tie identification markers on each connector. Still no spark. I finally came to the conclusion I was the source of my problems and I needed to seek an outside set of eyes and knowledge. That source happened to be Kevin at a local lawnmower shop. He quickly discovered what I had failed to check because I was convinced it was okay. Coil ground wire connected to the wrong ground connector. It was an inconvenient wire to check, I had checked it before and a hundred other excuses and reasons why I failed to find it. But he did. He was not a motorcycle shop but he had years of experience with magneto type ignition systems and their frailties. There is a lot of experience and knowledge here but no eyeballs that can check what you’ve checked many times over. If you can, go find the “Kevin” in your area. Good luck.
 
I realize this is an old thread but I am having The same issue of chasing no spark. Most of my problem is that I have never had a bike this old so I am still learning The points and condensor system. I have a 1971 CT70 K0. I took over The restoration on this bike on The rebuild, so I wasn't able to be part of The breakdown. I have rebuilt The stator 3 times. Everything is brand new, wire harness, OEM key switch, stator components (I have 2 sets). I feel like The stator is set up correctly, however, when I rotate The flywheel (Hitachi) past The "F" mark, I do NOT see The points opening even The slightest. Shouldn't The points be opening at this mark? I've tried making The adjustments on either side to no avail. Could it be my flywheel? The shop manual is no help at all, but I've considered buying The Clymers manual. I'm happy to put pics up if someone will chime in. Many thanks from this first time points guy!
 
I finally got spark- it was just finding the right coil. I figured out my question on how many volts out of the stator on the 81 CT110. 6-9vac is plenty!
 
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