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MX100 IGNITION

  • Mkdxxx
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MX100 IGNITION was created by Mkdxxx

I bought a 80 mx100...EXCEPT IT HAS POINTS.  this suggests its a 79 and the vin seems to agree with that.  IS IT POSSIBLE to convert to a cdi.  looks like a 1990 RT100 uses same part numbers as 1980 MX100. 
02 Jan 2022 00:23 #1

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Replied by RT325 on topic MX100 IGNITION

Points is "back to the future". Leave it as is & have a trouble free ride--providing it's working now that is. Sorry, i'm no help am i.
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02 Jan 2022 01:42 #2

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Replied by MarkT on topic MX100 IGNITION

Check your VIN against tables in Tech Library to determine year... 

Also very likely points mag was installed because CDI failed...  that same CDI was used on MX175 and in my experience rarely works for some reason.  And it's not something simple like the box.

Yamaha points system aka "mechanical CDI" is simple, very reliable and puts out a great spark.  If you simply must have a CDI there are many options including new ones from VAPE and likely HPI.  If you decide to buy a used one for that model, make sure it came from a good running engine.  Stators can test perfectly with meter but won't always work...  in fact like I said that specific model CDI rarely works in my experience.  Sometimes they spark and bike will start but engine won't rev up. 

If you buy used, get a "set"...  matching flywheel and stator.  The complete system from a late (80-81) DT125 or DT175 will work too.  For the prices these days, might be best to go new. 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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02 Jan 2022 03:48 #3

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Replied by Mkdxxx on topic MX100 IGNITION

Thank you for the information.  I pulled the cover off and found some bad looking points and numerous broken wires.  This should be fun.  Back in the day I had gt80 which looks similar from what I can remember.
Vin shows 79.
Last edit: 02 Jan 2022 21:31 by Mkdxxx. Reason: more nfo
02 Jan 2022 21:28 #4

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Replied by RT325 on topic MX100 IGNITION

Oh--well, i guess that opens a can of worms, so have you not had it running since owning it?. With a points mag on pretty much any Yamaha all you need is 'The Black Wire' straight to the coil to get spark. So if the stator ignition coil isn't shredded then you could be lucky. If it has a lighting coil & if ya lucky the damaged wires are from there & can be tied off out of the way.
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Last edit: 03 Jan 2022 02:26 by RT325.
03 Jan 2022 02:23 #5

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Replied by Mkdxxx on topic MX100 IGNITION

Heres a pic of the mag...
03 Jan 2022 20:59 #6

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Replied by MarkT on topic MX100 IGNITION

Nothing complicated.  The wire from the points and the source coil should connect on the condenser and the wire from stator to the ignition coil probably connects to condenser too...  they all 3 connect together at stator...  several ways to do it. 

You have one of the later "upside down" condenser styles so can't see for sure. 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
04 Jan 2022 06:31 #7

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Replied by Sneezles61 on topic MX100 IGNITION

I hope I ask this question here without steeping on Mr. MKD's toes...
Is there a reason why the condenser lives under the flywheel/mag?
Sneezles61 
04 Jan 2022 07:23 #8

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Replied by Mkdxxx on topic MX100 IGNITION

I don't think so.  I think it could be located on the frame.
05 Jan 2022 23:17 #9

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Replied by Mkdxxx on topic MX100 IGNITION

I would add back to the original topic that I was hoping more of the parts would be available from Yamaha but it doesn't look that way.  you can still get the points and condenser but the coil is not available and I'm kind of wondering if that could be rewrapped or another bikes coil be used.  With the points what controls the opening and closing... I assume it has to do with the lobe on the flywheel can somebody confirm that???
05 Jan 2022 23:20 #10

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