Question about Motorcycles
SOURCE: I have no spark 2000 KTM 125 sx
Before going to the CDI system go ahead and check the kill switches including the side stand switch, with an Ohmmeter. How good is the battery? Check the fuses. Check the wiring harness. Are all wires clean and with a solid connection? Any abraded wires? Check the operation of the ignition switch with a volt ohmmeter. Is the bike in neutral and the neutral light is lit up?
You can download a free PDF factory service manual by going to the website below >
The manual should tell you in detail how to test the CDI and other electrics.
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Posted on Apr 08, 2009
SOURCE: no spark 110cc engine wont start
Check the fuses. Next, check for spark but with a new spark plug. How good is the battery? If needed, add water to the battery cells enough to cover the top of the cell plates.Try a jump start from your car battery. Is the kill switch on? Check the operation of the ignition switch with a volt ohmmeter. You should be getting power into and out of the ignition switch.
If the bike doesn't start and run properly check the side stand kill switch. It kills the engine so that you don’t start out with the side stand down. Broken or out of adjustment, it would kill the spark. Check for a broken wire at the switch or coupler. Get a service manual and check out the electrical section. Some bikes have a diode integrated into the turn signal relay. Try moving the kill switch by hand. If that doesn’t work then wire a jumper around the switch to bypass it. If that doesn’t work, check out the relay.
Check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral switch wire on center casing.
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Posted on May 28, 2009
The voltage on the coils is present except at the instant of firing. The interruption of the voltage is what causes the coil to fire. The cdi box is what causes the voltage interruption.
The interruption is very hard to detect. You are not the first to be stymied by that box. If you have access to an oscilloscope, I think you can see the pulse if it occurs.
Posted on Jun 15, 2009
Those bikes can be a pain to start after they've sat awhile. What always worked for me was twist the throttle a bunch. I mean make sure its flooded. Then lay the bike over on its left side until the gas runs out the overflow. Stand it up and lay it down until it stops running out. Then I squeeze the decompression lever and cycle the motor. Now just barely pull on the decompression lever to open the valve just barely. Get it to top dead center and give her a good kick with a twist of the throttle. Becareful it could kick back.
This technique works for when the bike stalls when its hot. Most important part is if you think its flooded lay it over and start the process over. Remember your XR has two carbs and will flood QUICK. After some practice you'll be able to hear it in the exhaust pipe if she's flooded or if she trying to come around. Trust me. I have four of these bikes. Two 83's, one 84 and my beloved 85.
Posted on Feb 19, 2010
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