atocp Posted June 26, 2009 Share Posted June 26, 2009 First and foremost, I'd like to point out I never did physics at school. An whereas I can tinker to get something working, the proper procedures usually aren't followed by me when it comes to electrics. Question: I have a YB100 and I believe the coil may be faulty. I set the Voltimeter to 200 (not 200k) and tested the ground and the 'live' to the negative and positive respectively. It gave me a reading of 2.4. I then put the voltimeter to 200k and tested the ground and the HT lead, and got a reading of 6.3. I then did the same but replaced the plug cap to the lead, and got a reading of 10.9. Does anyone know if this is anywhere near the correct readings? I checked haynes, and it talks about 0.17ohms +/- 10%. But I don't seem to get near those values. Even after changing the voltimeter settings. Does this sound like it is time for a new coil? I have a feeling it might be. I just bought a new NGK spark plug cap, would it really throw the readings as much as it has, even with a new coil? As always, thank you for any advice and assistance you can give me. cheers, atocp Link to comment Share on other sites More sharing options...
JimR Posted June 27, 2009 Share Posted June 27, 2009 First and foremost, I'd like to point out I never did physics at school. An whereas I can tinker to get something working, the proper procedures usually aren't followed by me when it comes to electrics. Question: I have a YB100 and I believe the coil may be faulty. I set the Voltimeter to 200 (not 200k) and tested the ground and the 'live' to the negative and positive respectively. It gave me a reading of 2.4. I then put the voltimeter to 200k and tested the ground and the HT lead, and got a reading of 6.3. I then did the same but replaced the plug cap to the lead, and got a reading of 10.9. Does anyone know if this is anywhere near the correct readings? I checked haynes, and it talks about 0.17ohms +/- 10%. But I don't seem to get near those values. Even after changing the voltimeter settings. Does this sound like it is time for a new coil? I have a feeling it might be. I just bought a new NGK spark plug cap, would it really throw the readings as much as it has, even with a new coil? As always, thank you for any advice and assistance you can give me. cheers, atocp Hi Atocp, what heve you set the meter to read 200 ???? I would guess a YB with no spark will be down to the ignition timing (if the timing is a long way out u wont get a spark at all irrespective of a voltage from the HT lead to earth you have to take into account the voltage from the HT lead to earth is well in excess of 200v !. So I guess just get the timing sorted ! Regards Jim Link to comment Share on other sites More sharing options...
atocp Posted June 29, 2009 Author Share Posted June 29, 2009 Hi JimR, The voltimeter had the options 2M, 200k, 20k, ->2k and 200. The 200 was the only one that seemed to get a reading when I connected the ground and the wire. And the same reading was given when i tried the HT and ground using either 200k or 20k. It just changed itself automatically to read the same value. I will go away and read up on the Haynes manual and see what I can do about the timing. I have a new ignition coil on the way. But i'll check the timing before I install the new one. Thank you again for the help JimR, very much appreciated. cheers, atocp Link to comment Share on other sites More sharing options...
JimR Posted June 30, 2009 Share Posted June 30, 2009 Hi JimR, The voltimeter had the options 2M, 200k, 20k, ->2k and 200. The 200 was the only one that seemed to get a reading when I connected the ground and the wire. And the same reading was given when i tried the HT and ground using either 200k or 20k. It just changed itself automatically to read the same value. I will go away and read up on the Haynes manual and see what I can do about the timing. I have a new ignition coil on the way. But i'll check the timing before I install the new one. Thank you again for the help JimR, very much appreciated. cheers, atocp Hi atocp, so I guess your talking an ohm meter so now I know you have one you need to check the HT lead to earth & also the small (orange) wire to earth if you can give me those readings I could work out if the coil is U/S but tbh I would guess the timing to be incorrect Regards Jim Link to comment Share on other sites More sharing options...
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