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MX100 IGNITION

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Replied by Sneezles61 on topic MX100 IGNITION

Yes, a lobe on the crankshaft.. 
I often wonder about the coil AND condenser... I'm not sure how to look up that info as to what could or could not work.. Perhaps that bit of info from the engineers didn't make it out to any manuals back then..
Sneezles61 
06 Jan 2022 03:38 #11

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Replied by MarkT on topic MX100 IGNITION

DEET can rebuild your stator. 
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
06 Jan 2022 07:15 #12

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Replied by Schu on topic MX100 IGNITION

The 360 and 400 that I converted to points ignition both had cams on the internal hub of the flywheel. So you had to swap the flywheel as part of the changeover.
Schu

CT1B, CT1C, JT1, JT2, DT360A, GT80B, DT100B, DT125B,
DT175B, DT175C, DT250B, DT400B, Z50, SCR950

Someday, you'll own some Yamahas
06 Jan 2022 09:30 #13

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Replied by MarkT on topic MX100 IGNITION

I looked at your pic again and not sure why you'd need a new source coil...  could be damaged from using the incorrect puller though? 

Anyway, several on ebay. Here's one  ebay link

Sneezles, used to relocate condensers all the time...  several ways to do it.  Midlife Motor posted his method here.  yamaha-enduros.com/index.php/forums/74-7...er-relocation#106154
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
The following user(s) Liked this Post: Sneezles61, Mkdxxx
06 Jan 2022 09:46 #14

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Replied by Sneezles61 on topic MX100 IGNITION

Thank you Mark.. I've always thought it shouldn't matter where.. just that it IS in the circuit..
   And doing more looking about the coil to use ..or not.. The ignition source/stator coil along with the coil and the spark plug heat are in concert with each other.. Mated.. matched.. however you'd care to call it..
Sneezles61 
06 Jan 2022 10:39 #15

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Replied by MarkT on topic MX100 IGNITION

I've found the Yamaha points magneto on these bikes to be remarkably flexible in terms of ignition coil.  It's an "Energy Transfer" type magneto which some have called a "mechanical CDI" as the principle is similar.  Ignition coil is just an AC step-up transformer that converts the voltage pulse (hundreds) when the points open or the capacitor discharges into the high voltage pulse (tens of thousands) need to jump the spark gap and ignite the mixture.  Biggest problem with ignition coils is some of the cheap junk sold out there. 

Spark plug heat range has nothing to do with the "electrical" part of things...  the center firing tip of the plug is exposed to the intense heat of combustion and needs to shed that heat.   Tip has to stay hot enough to burn off deposits but not so hot that it burns up or turns into a glow plug.  The heat management is done by increasing or decreasing the distance of the heat path by changing plug construction.  www.autozone.com/znetrgs/repair_guide_co...0900c1528005c68d.gif

Best advice is to use OEM parts when you can... 
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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06 Jan 2022 11:15 #16

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Replied by Sneezles61 on topic MX100 IGNITION

I apologize for diverting the OP post..
Thank you again Mark... damn cold out up here, so reading into how things work..
   I figured the long plugs were because of the aluminum head needed more mass... I'll stop my query's now.. 
Sneezles61
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06 Jan 2022 12:01 #17

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Replied by MarkT on topic MX100 IGNITION

It's not the thread length in the head...  it's the internal ceramic insulator length.
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
06 Jan 2022 12:15 #18

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Replied by Mkdxxx on topic MX100 IGNITION

What's a deet???

I don't know the history of this bike.  I bought as is for very little money and owner said it had been sitting for a long time.  Source coil is coming unwrapped.  I have yet to test but it doesn't look chewed up.  Flywheel was off when i bought it.  Could be fine but I want to make sure the electrical system is solid.  Points are very dirty...again sitting for long time.  I toyed with the idea of switching it out to cdi but as you guys recommended thats not the best solution.  From a parts perspective the points and condenser are still available to buy.  That ebay link shows a mx80.  Is that going to be the same thing?  I expect so.  gt80,mx80,dt100,mx100 etc.  is there a difference between a coil used for points and a coil used for CDI?  Thinner wire????

more questions...what's a stator in the context of  this machine?  Are all the ignition parts interchangeable in models...i tried getting parts for a 90 rt100 but no luck.
Last edit: 06 Jan 2022 20:45 by Mkdxxx.
06 Jan 2022 20:15 #19

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Replied by MarkT on topic MX100 IGNITION

DEET is a "who".

I went by the part number and parts sometimes fit many models. 

 
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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06 Jan 2022 20:40 #20

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