Picture Attachments Fixed? (18 Feb 2023)
Hopefully, the pictures uploads are fixed for the time being. Let me know if you continue to have issues. I am looking into a more permanent solution. Thanks for your patience. - Makotosun
[Help] with my '73 DT3 250, having ignition issues
- MarkT
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Replied by MarkT on topic [Help] with my '73 DT3 250, having ignition issues
With a good ohmmeter, preferably an analog (swinging needle) type with an Rx1 scale, you should get 0 ohms with points closed and about 1 to 2 ohms with points open.
So with the points closed, scope should read no voltage. Components are precisely placed on the stator so that points open when voltage generated by magnet passing by stator coil winding is at or near maximum.
That sudden surge of voltage when points open energizes the primary winding in the ignition coil in a split second... the sudden creation of a magnetic field in the ignition coil primary winding induces the high voltage in the secondary winding of the ignition coil and Viola! Spark!
(Ignition coil is just an AC transformer)
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- alnarv
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Replied by alnarv on topic [Help] with my '73 DT3 250, having ignition issues
alnarv
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- Ht1kid
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Replied by Ht1kid on topic [Help] with my '73 DT3 250, having ignition issues
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- 19stuberd
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Replied by 19stuberd on topic [Help] with my '73 DT3 250, having ignition issues
Also, additional question, does anyone know if these voltages are typical for these coils? Thanks again.
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- RT34Me
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Replied by RT34Me on topic [Help] with my '73 DT3 250, having ignition issues
Sorry............couldn't resist.Keep at it,I've been there.My bike's a screamer now and starts first kick.
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- Ht1kid
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Replied by Ht1kid on topic [Help] with my '73 DT3 250, having ignition issues
This is from my CT1C manual it shows you the test process also clean your points Really good since you had tape on them could have some glue on them be sure to take the plug cap off if you do the testĀ
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- RT325
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Replied by RT325 on topic [Help] with my '73 DT3 250, having ignition issues
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- johnste1960
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Replied by johnste1960 on topic [Help] with my '73 DT3 250, having ignition issues
If it has been converted to a CDI, the manual will be somewhat helpful, but the measurements and readings are for a points based bike. Be sure to account for the differences in the CDI ignition if this is the case.
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Replied by RT325 on topic [Help] with my '73 DT3 250, having ignition issues
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- MarkT
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Replied by MarkT on topic [Help] with my '73 DT3 250, having ignition issues
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