Does any one know how the electrical system works on a motorcycle? I am familiar with the electrical system on an automobile using an alternator. I am having a problem getting a spark at the plug. Gaps on the plug are correct. I looked at the coil and it only seems to have “one side to it” unlike a car with two sides to the coil. Can anyone help me out in trouble shooting a spark plug with no spark? Thanks in advance for your help
2006-06-25 07:41:43 · 2 answers · asked by Tony 1 in Cars & Transportation ➔ Motorcycles
Make and year = 1974 CT 70 - I did check for resistance (ohm) from in input wire and output wire on the coil. It did show continuity.
2006-06-25 07:56:41 · update #1
honda ct70
2006-06-25 08:13:58 · update #2
I found one on Ebay.... see atached link for picture. This is the same one that I have... thanks
http://cgi.ebay.com/ebaymotors/HONDA-CT70-CT-TRAIL-70-IGNITION-COIL-SPARK-PLUG-WIRE_W0QQcmdZViewItemQQcategoryZ35594QQihZ002QQitemZ4653198910QQrdZ1QQsspagenameZWDVW
2006-06-25 08:29:03 · update #3
The coil on a 1974 CT70 should have 2 terminals and the high tension lead. (just like a car). Battery power goes in one terminal and comes out the other terminal and goes to the points. Maybe someone put the wrong coil on the bike.
The only other thing that I can think of is someone put the wrong coil on the bike and wired the points differently. If that's the case, battery power to one side of the points. The other side of the points goes to the coil. The coil is then grounded to the bike. When the points open, that breaks the circuit and fires the spark plug. Send me your e-mail address if you need a wiring diagram.
2006-06-25 08:22:55 · answer #1 · answered by guardrailjim 7 · 1⤊ 0⤋
Usually the mounting bolt supplies the ground side or it could be grounded through the CDI/ECU box. What bike, what year, what model?
2006-06-25 07:47:19 · answer #2 · answered by 1crazypj 5 · 0⤊ 0⤋