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Makotosun

DT 125 fresh rebuild only backfires

  • Anthony44
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Replied by Anthony44 on topic DT 125 fresh rebuild only backfires

Hey guys I adjusted it clockwise and it started up first kick and idles perfect. The marks line up perfect and I tightened the flywheel nice and snug but not to spec. I have a tusk clutch holder that has pins on it that fits perfect in the holes of the fly wheel.

It makes a sqeeling noise at low idle but goes away the second I give it a tiny bit of throttle so i know its not a mechanical problem. I think it's the random conical washer I added under the flywheel nut. I found a conical washer in my parts bin that was the exact size as the crank threads and added it. I think its because the washer isnt compressed fully is whats making the noise. Going to find a flat washer tomorrow and I guarantee it'll go away. Hopefully. Thought?? Ps I know my carb is leaking very bad haha I need to fix that asap.
 
Last edit: 12 May 2022 18:34 by Anthony44.
12 May 2022 18:26 #21

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Replied by Anthony44 on topic DT 125 fresh rebuild only backfires

12 May 2022 18:28 #22

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Replied by RT325 on topic DT 125 fresh rebuild only backfires

Firstly congratulations, she runs. Noise won't be the washer & conical or not the nut should be well tight enough to flatten it out. If its not tight enough the flywheel will slip. So--very unusual noise & is the flywheel touching a screw holding the stator plate on or something like that. Or magnets touching the coils if the crank isn't perfectly true to turn. Could be a dry main bearing but not likely. Sounds external as you say. Always something new to diagnose with old bikes. Does it change or not happen i you lean the bike way over to the left--then right.
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12 May 2022 19:23 #23

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Replied by Anthony44 on topic DT 125 fresh rebuild only backfires

Runs absolutely perfect now thanks for all the help guys.
14 May 2022 12:05 #24

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Replied by MarkT on topic DT 125 fresh rebuild only backfires

Congratulations!!! 
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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14 May 2022 12:48 #25

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Replied by Schu on topic DT 125 fresh rebuild only backfires

It sounds great!
I’d love to hear that triple Kawi in the background with the pipes on it!
I have to find a test tank like yours. I’ve been using a quart oil bottle with a squirt spout but the fuel line keeps popping off and making a mess.
Looks like yours is a weed wacker tank. I have an old Bolens in the barn that I just haven’t scrapped yet. My future test tank!
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
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Last edit: 14 May 2022 12:58 by Schu.
14 May 2022 12:55 #26

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Replied by Anthony44 on topic DT 125 fresh rebuild only backfires

Yep it's a weedwacker tank I had laying around flipped upside down so gravity feeds it into the carb works perfect! And yeah that triple is my baby it's a 1975 h1500 I fully restored it and has higgspeed GP pipes. It sounds amazing. I'll have to post a video on it when I fix the left carb leak. Needs finishing touches like the side cover and tail piece I have just haven't put them on yet, also need to lose those foam uni filters and get 3 small K&Ns
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Last edit: 14 May 2022 13:12 by Anthony44.
14 May 2022 13:06 #27

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Replied by Anthony44 on topic DT 125 fresh rebuild only backfires

Anyone know how this silencer mounts? Makes no sense to me
14 May 2022 13:45 #28

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Replied by MarkT on topic DT 125 fresh rebuild only backfires

Mount is missing plate with stud that should be laminated to rubber block. 

From parts drawing it might be upside down too.
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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14 May 2022 15:03 #29

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Replied by Anthony44 on topic DT 125 fresh rebuild only backfires

I'm gonna have to find a mount on ebay If it's available. I'm just happy I found the silencer because they're very hard to find.
14 May 2022 15:16 #30

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