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Post by dknupp on Jul 5, 2013 19:59:10 GMT -6
Just bought an 85 that has been sitting for a year. I stuck a screwdriver in the plug wire and am not getting any spark. Could I get some recommendations on where to start? I would think that testing the coils would be the next solid move, but I'm new to motorcycles and am just kind of fumbling my way through the dark with this one. Also, the ignition switch is touchy and requires a bit of a wiggly from ON to crank. Thanks!
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Post by Jet⚡Black on Jul 6, 2013 21:37:09 GMT -6
That's not a good way to check for spark, you want to leave the plug in the boot make sure it's in neutral on the center stand kick stand up and then bump the starter and look for spark.
You might be getting a safety lockout over ride preventing spark or starting... if you trust the screw driver test, either from the kickstand or the clutch lockouts. The kick stand has to be up and the clutch pulled in or bike in neutral... you can by pass these by plugging them into each other, or find the brown wire and black and yellow wire on the IC ignitor twist those together then run that to ground.
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Post by dknupp on Jul 7, 2013 13:17:54 GMT -6
Okay, I pulled a plug (with the boot on) and checked for spark. I did this while in neutral and on the kickstand. When I test the coil, the needle just jumps off the chart, which I take to mean that I have a bad coil.
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Post by Jet⚡Black on Jul 8, 2013 1:44:51 GMT -6
The meter should be set Volts, key switch on bike switched to run stand up bike in neutral... the black meter lead to ground, red lead touching each coil power wire one at a time... it should read 12 or more volts if the battery is charged. If you have power to them good. Now you can turn the key off, switch the meter to ohms, then touch both meter leads to the coil wire posts... you should get some where between 1 to 4 ohms from post to post, from each post to plug socket etc. test both coils... if the meter reads zero or does not move at any of those or is under .5 ohms it's most likely gone South... both coils going out is kinda rare one makes sense but not both.
Wiring for them: Sitting on the bike seat; my right hand coil is wired top coil post Yellow/red stripe, bottom coil post is black. Sitting on the bike seat; left hand coil is wired top coil post Yellow/red stripe, bottom coil post is green. Also the spark plug wires exit the coil closest to the engine not out towards the handle bars.
No spark trouble shooting from manual:
1. ignition switch off 2. Engine kill switch in off position 3. Battery voltage too low 4. Plugs defective fouled or worn out 5. Plug caps cracked or plug wires faulty 6. Plug cap making poor contact 7. Defective IC igniter 8. Defective / dirty pickup coil 9. defective coils 10. ignition or kill switch defective or corroded 11. Wiring shorted or broken between: a. Ignition switch and kill switch b. IC igniter and kill switch c. IC igniter and coils d. Coil and plugs (unscrew plug boots trim of about 1/4 inch from the wires and then twist boots back on clockwise) e. Ic ignitor and pickup coils
You might want to clean all your connectors or visually inspect them, look for loose and broken wires/corrosion and rub spots between body and wires. Make sure all your grounds are tight.
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hoosierrick
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Posts: 46
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Post by hoosierrick on Jun 11, 2014 19:53:53 GMT -6
Mine also has no spark. The clutch switch and kick stand switch have been bypassed by previous owner. 1986 en450, 17,000 miles. Late last fall I hooked up a battery tender. The neg clamp popped off, grounding the positive clamp to the battery box. It smoked the ground wire to the battery box by the time I got to it. (I was a few feet away) I removed the battery over the winter. I started out this year with a valve adjustment. I got it back together on Sunday to discover that I had lost spark. I marked the wires before removing the coils. I found a melted looking spot on the harness from the pickup coils , but after I pulled the harness out and opened it up, I found no damage to the wires themselves, only the outer cover. From the troubleshooting in my Clymer manual, and a Haynes I downloaded, I am thinking the igniter is the culprit. Could The short from the battery tender have caused damage to the igniter ?
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