facebook1 youtube1 twitter1 instagram linkedin1 pinterest1

NOTICE:  If you are not a free registered member of the site, you will not see the photos in the forum, and you won't be able to access our premium member content. Please consider joining our community! REGISTER AND MAKE THIS BOX DISAPPEAR!

×

Pictures Posting Not Working (12 Jun 2023)

Picture uploads is again unavailable. We are working on the problem. Thanks for your patience.

Makotosun

[Help] with my '73 DT3 250, having ignition issues

  • Posts: 1240
  • Likes received: 543

Replied by AirborneSilva on topic [Help] with my '73 DT3 250, having ignition issues

My guess would be carburetion...
2023 Tenere T7
1976 DT400C
1975 DT400
1981 DT175H
1972 DT2 250
1980 GT80
1972 JT2
12 Apr 2023 17:18 #121

Please Log in or Create an account to join the conversation.

  • Posts: 9312
  • Likes received: 3575
Not sure if i'm up on the play with this story. But the last video where it only just runs sounds ignition like points are miles too wide &/or plug way too wide, maybe both. What's been going on. Have you been altering points out of range. Going back a page or two there's a video of it reving clean to the point of being rich & safe at max revs, just maxing out a bit rich on the main jet. Not forgetting the tiny Oring but if it was 'that' it'd be a lot richer & limited--i guess depending how bad it's leaking fuel past to bypass the main jet. But talking the curren vid where just starts then misfires & stumbles--reffer to my first sentence.
12 Apr 2023 17:33 #122

Please Log in or Create an account to join the conversation.

  • Posts: 12934
  • Likes received: 8440
If nothing was changed or "fixed" recently, put in a new properly gapped spark plug.
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
12 Apr 2023 18:38 #123

Please Log in or Create an account to join the conversation.

  • Posts: 1702
  • Likes received: 1051

Replied by Mothersbaugh on topic [Help] with my '73 DT3 250, having ignition issues

Did you bleed the oil pump to get all the air out of the lines? It will run ragged, as the mixture it is burning will not be consistent with air in the lines. Do you have at least a half tank of oil while you are trying to solve this problem? You don't want it to be gulping air through the hose from the tank to the pump.
12 Apr 2023 22:27 #124

Please Log in or Create an account to join the conversation.

  • Posts: 114
  • Likes received: 30
Flywheel slipped

cliff
13 Apr 2023 00:57 #125

Please Log in or Create an account to join the conversation.

  • 19stuberd
  • 19stuberd's Avatar Topic Author
  • Offline
  • Premium Member
  • Premium Member
  • Posts: 58
  • Likes received: 13
Thanks for playing everyone, I think that I've found our issue. See if you can guess from the first video and then you'll see in the second. I think it's pretty obvious what I need to replace, no spoilers here ;)

photos.app.goo.gl/mN113o9sAYwA1oD3A

photos.app.goo.gl/8Lq73UDyNQCRMtDc7
13 Apr 2023 11:01 #126

Please Log in or Create an account to join the conversation.

  • 19stuberd
  • 19stuberd's Avatar Topic Author
  • Offline
  • Premium Member
  • Premium Member
  • Posts: 58
  • Likes received: 13
Also thanks for the reply Mothersbaugh, I did in fact bleed and purge the lines thoroughly, especially since I did the test where you rotate the pump 200 times to check oil output at least 3 times lol. Good to check though, I almost didn't check that before!
The following user(s) Liked this Post: Sneezles61
13 Apr 2023 11:04 #127

Please Log in or Create an account to join the conversation.

  • Posts: 9312
  • Likes received: 3575
Yamaha have black oil lines so we won't worry, & never a problem providing oil in the tank.
13 Apr 2023 16:03 #128

Please Log in or Create an account to join the conversation.

Moderators: yamadminEnduronutMakotosunDEETVinnieDevinJames Hart