Question about 1972 Yamaha DT 360

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I have a 1972 yamaha 360. it had ran 1 min when i first got it, then died. fiddled around a bit and got it to run 30 seconds then died again. checked for spark none existent. clean points, ground connection at high tension coil, dismounted all the lighting coils and ignition coil, sanded where the bolts touch the iron core and where the iron core touches the stator plate. even sanded the connection where the condensor mounts as well as where the points attatach. put it all together... no spark. check high tension coil, specs out good as well as spark plug cap (new). check condensor, not shorted, hi resistence to low resistence then swings to o.l on my ohm meter. now heres the interesting part, i read somewhere that you dont need the condensor in the ckt so i taped it up with electrical tape so that it couldn't ground out. I got spark like lightning shooting out of the sky. yet i swap out the condensor and same issue. it doesnt like being grounded to the stator plate when its bolted on. then i checked the wires that go to the top of the condensor and the ring out to gound!!! do points need to be grounded or insulated? i just dont get it, why it works when the condensor isnt installed but not when it is. and yet i know the condensor isnt shorted. its putting out about .299 microfarads. all this brings me to my quesion, what shouldnt be grounded? the points have the insulator washers in them, do these ever go bad? and should all the coils be mounted to ground? thanks for now

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  • Yamaha Master
  • 41,662 Answers

Hi, Greener_dude nice novella and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
DT360 NO SPARKLETS Vintage Enduro Discussions
How to fix No Spark Problem on Motorcycles and Dirt Bikes
DOWNLOAD NOW Yamaha DT250 DT360 DT 250 360 Service Repair Workshop Manual... $15
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-dt

Posted on May 23, 2017

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polarcycle
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SOURCE: No Ignition

There is no way to check the CDI boxes that I know of. If your pick ups are good, and everything else checks out, that would be suspect. Make sure the wiring going to all of the components have good continuity, and make sure you haven't blown a fuse. Beyond that, it sounds like your problem. You may be able to have it repaired if you have an electronics repair shop in your area.

Posted on Jul 02, 2009

miket756
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SOURCE: Is there any reason why my ignition coil would keep blowing up?

the ignishion coils has about 20,000 volts in it and that takes a lot of holding back, if there is the slightest crack or its got wet then these volts will forse there way out the problem is once they have found a way out they leave a track of carbon and they will all ways find that track after that you can clean it as much as you like but you will never get rid of the track, the best thing to do it change all the parts that are shorting out but pack the joints with silicon grease this should stop water getting in again and stop it from shorting out as for using insulating take that is far to thin to hold back 20,000 volts as the spark for that can jump over 1/4 of an inch just look how thick the plug leads are? and they only just hold it back

Posted on Jan 14, 2010

Testimonial: "Thanks, thats pretty much along the same lines i was thinking. I've got a few more questions which i've added to the post. Thanks!"

  • 3567 Answers

SOURCE: its a 1973 yamaha CT1 175 There is no list for it

I haven't worked on that bike in 30 years, but as I recall, the black wire goes to the points. The coil grounds via the mounting bolts.

Posted on Jun 20, 2010

  • 10 Answers

SOURCE: 1972 Yamaha RT2MX (360cc) stator

the 72 rt2mx does not have points but the 73 mx 360 does i have a 72 i am working on now an it is back firing when i kick it. not bad seeing how it has been sitting 10+ years. goin to research the timing settings an get this baby riding again

Posted on Feb 08, 2012

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