MELLERS
21-11-2002, 11:40 AM
THE FOLLOWING TEST ARE EXPLAINED IN THE HAYNES MANUAL IN THEIR OWN INIMITABLE STYLE BUT IF YOU DO NOT HAVE THE MANUAL DO THEM LIKE THIS:
On a magneto cdi system bike such as the TZR the system is stopped by shorting the cdi's supply to earth, In practice This means that whether you knew it or not when the engine is running both the ignition and kill switches are subject to higher voltages than those found in a mains socket! meaning that Any moisture or dirt entering these switches can cause tracking and arcing, As the ignition source coil only outputs a small current (BUT HIGH V.) any tracking or arcing in the ignition and/or kill switch robs power from the system resulting in at best a weak spark or at worst No spark at all.
TESTING:
1. Unplug both the ignition switch and the killswitch from the wiring loom (The reason some bikes are preferred by thieving scumbags as it means this is all they have to do to get it started! :evil: ) if the spark returns then reconnect each switch in turn to see which one is at fault. Obviously both switches must be in the "RUN" position when reconnected to prove this!)
2. Once you have found the guilty switch it is far easier to chuck it out and buy a new one than to try and repair it but if you absolutely must then i will soon be posting another topic "BODGING DODGY KILL SWITCHES"
3. DO NOT REPLACE A KILL SWITCH WITH ANYTHING LIKE A HORN BUTTON as these lesser switches cannot handle the high voltage that will be placed on them and is also not properly insulated which will give you a serious kick if you touch it with wet gloves or in similar situations! :shock:
4. If these test and the tests i the CDI GENERATOR TESTING topic both check out it looks like you might have a dead CDI unit :cry: if you can't find a tzr cdi secondhand (£130+ new) then Iwill soon be posting another topic "FITTING A C90 CDI TO A TZR125 OR SIMILAR"
HAVE A CUP OF TEA NOW!
On a magneto cdi system bike such as the TZR the system is stopped by shorting the cdi's supply to earth, In practice This means that whether you knew it or not when the engine is running both the ignition and kill switches are subject to higher voltages than those found in a mains socket! meaning that Any moisture or dirt entering these switches can cause tracking and arcing, As the ignition source coil only outputs a small current (BUT HIGH V.) any tracking or arcing in the ignition and/or kill switch robs power from the system resulting in at best a weak spark or at worst No spark at all.
TESTING:
1. Unplug both the ignition switch and the killswitch from the wiring loom (The reason some bikes are preferred by thieving scumbags as it means this is all they have to do to get it started! :evil: ) if the spark returns then reconnect each switch in turn to see which one is at fault. Obviously both switches must be in the "RUN" position when reconnected to prove this!)
2. Once you have found the guilty switch it is far easier to chuck it out and buy a new one than to try and repair it but if you absolutely must then i will soon be posting another topic "BODGING DODGY KILL SWITCHES"
3. DO NOT REPLACE A KILL SWITCH WITH ANYTHING LIKE A HORN BUTTON as these lesser switches cannot handle the high voltage that will be placed on them and is also not properly insulated which will give you a serious kick if you touch it with wet gloves or in similar situations! :shock:
4. If these test and the tests i the CDI GENERATOR TESTING topic both check out it looks like you might have a dead CDI unit :cry: if you can't find a tzr cdi secondhand (£130+ new) then Iwill soon be posting another topic "FITTING A C90 CDI TO A TZR125 OR SIMILAR"
HAVE A CUP OF TEA NOW!