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1969 Dt1-250 no spark
- BDub
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Replied by BDub on topic 1969 Dt1-250 no spark
So I finally received a new set of points from Partzilla (3 weeks) and installed them in the plate. With the points open I am reading about 2 ohms and 0 with them closed. Per Mark T’s advise I bought an analog meter - set at X1K. I’m unclear where to check the primary though. I seem to get zero when testing resistance at the condenser to the plate. Are those the correct places to test?
11 May 2024 13:59
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- MarkT
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Replied by MarkT on topic 1969 Dt1-250 no spark
Rx1, not 1k
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
11 May 2024 20:19
#12
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- BDub
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Replied by BDub on topic 1969 Dt1-250 no spark
Yeah, typo or something. Meant X1 on a GB Instruments GMT-319 meter.
11 May 2024 20:34
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Replied by BDub on topic 1969 Dt1-250 no spark
Yeah, typo or something. Meant X1 on a GB Instruments GMT-319 meter.
11 May 2024 20:42
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Replied by MarkT on topic 1969 Dt1-250 no spark
Points open reading pretty much is checking the primary stator winding.
With the stator assembled, testing at the condenser or at the black wire that goes to the ignition coil or at the wire on the points should give you that same points open and points closed readings, those places are all connected so it doesn't matter which place you test at.
With the stator assembled, testing at the condenser or at the black wire that goes to the ignition coil or at the wire on the points should give you that same points open and points closed readings, those places are all connected so it doesn't matter which place you test at.
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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11 May 2024 21:21
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- RT325
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Replied by RT325 on topic 1969 Dt1-250 no spark
If someone for instance was checking the resistance of the source coil but still had the black connected to the plug coil primary "wire going in", "via the loom with ignition switch turned on" i'm thinking it would about double the points open reading due to similar plug coil primary resistance.
They both measure bugger all, so twice B-all is still B-all
So on my stupid theory, if the source was faulty you could trick yourself into thinking its good.
Best to unplug the mag loom then take a reading from the black.
Happy to be corrected. Sorry if that's been well written before.
Re-reading i guess that's what Mark is saying anyway--black only.
Edit again
Forgotten what were talking but if DT1 it has a black spare wire halfway up the loom, so tapping that without disconnecting up top--ya know what i mean!! Or 'do i know' what i mean!! haha.
They both measure bugger all, so twice B-all is still B-all
So on my stupid theory, if the source was faulty you could trick yourself into thinking its good.
Best to unplug the mag loom then take a reading from the black.
Happy to be corrected. Sorry if that's been well written before.
Re-reading i guess that's what Mark is saying anyway--black only.
Edit again
Forgotten what were talking but if DT1 it has a black spare wire halfway up the loom, so tapping that without disconnecting up top--ya know what i mean!! Or 'do i know' what i mean!! haha.
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Replied by BDub on topic 1969 Dt1-250 no spark
A little bit of progress I think. With the new condenser and points installed on the stator plate, stator installed back in the bike, only the black wire connected - I did the scratch test and got a good spark with the plug laying on the head. Planning on reconnecting the rest of the wires from the stator one by one and testing spark each time. Then I guess installing the magneto and see what I have then. Does that sound like the right plan?
15 May 2024 18:55
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Replied by BDub on topic 1969 Dt1-250 no spark
Ugh. Put the magneto back on, checked the points gap and still not getting a spark. Points seem to be opening and closing. I am getting just a couple of AC volts reading from the black wire when kicking it over. Any ideas?
21 May 2024 18:28
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- RT325
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Replied by RT325 on topic 1969 Dt1-250 no spark
I do a lot of guessing, but have the black 'Not' connected up top. [which i guess is how you're testing it now].
Then kick over with something non conductive bridging the points for an AC voltage test.
Then do it again without the bridge [as you are now i think] just for a comparrison.
I did have videos of testing like that somewhere & by memory i think i got 7volts hooked to the plug coil but i'm only guessing. I'll link the post if i can find it but in the post i don't think i explained it very well.
Then kick over with something non conductive bridging the points for an AC voltage test.
Then do it again without the bridge [as you are now i think] just for a comparrison.
I did have videos of testing like that somewhere & by memory i think i got 7volts hooked to the plug coil but i'm only guessing. I'll link the post if i can find it but in the post i don't think i explained it very well.
21 May 2024 19:01
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Replied by RT325 on topic 1969 Dt1-250 no spark
First short vid via the link is kicking it over through compression with 'points bridged' & unhooked from the plug coil
Goes to close to 15AC volts with a good kick. 175cc lots of comp.
youtube.com/shorts/MyJ_KtM3DwY
Second live video is of having it plugged into plug coil.
Still had 'points bridged' & not sure now if plug lead was 'off or on the plug' but think it was off.
Got up to close to 7AC volts
So effectively testing the source coil output.
Third live video is of it running but using my "Peak Meter" so reading double volts compared to a normal meter i used for the other two tests. Should've done that final test with a normal meter!!. I can just see i have the peak meter set on 500 'peak'.
Now i watch it i see it goes to 100 peak volts while running so '50 normal AC volts'. Think i'm right!!.
Goes to close to 15AC volts with a good kick. 175cc lots of comp.
youtube.com/shorts/MyJ_KtM3DwY
Second live video is of having it plugged into plug coil.
Still had 'points bridged' & not sure now if plug lead was 'off or on the plug' but think it was off.
Got up to close to 7AC volts
So effectively testing the source coil output.
Third live video is of it running but using my "Peak Meter" so reading double volts compared to a normal meter i used for the other two tests. Should've done that final test with a normal meter!!. I can just see i have the peak meter set on 500 'peak'.
Now i watch it i see it goes to 100 peak volts while running so '50 normal AC volts'. Think i'm right!!.
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