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

Rebuilt RD250 won't start

  • Josepromano
  • Josepromano's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 4
  • Likes received: 0

Rebuilt RD250 won't start was created by Josepromano

I tore it down and built it back up. Gave it a leak down test, compression test, and timed the dyna s ignition, installed new coils and battery with fresh spark plugs. It checked to see if it sparks and it does..But! It still will Not start. Does anyone have any suggestions?
18 Oct 2019 13:49 #1

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

  • Posts: 54
  • Likes received: 79

Replied by DaveR on topic Rebuilt RD250 won't start

Did you get the float bowls mixed up ?
Only the LH bowl choke hole is drilled to pickup fuel, RH carb gets it's choke fuel from the crossover tube between the two.

Also make sure the carb sides are closing all the way.
The following user(s) Liked this Post: Snglsmkr
18 Oct 2019 16:39 #2

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

  • Posts: 13479
  • Likes received: 9340

Replied by MarkT on topic Rebuilt RD250 won't start

Also make sure the primary ignition wires aren't crossed... will have spark but fire with pistons at bottom instead of top.
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
18 Oct 2019 17:05 #3

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

  • Posts: 302
  • Likes received: 359

Replied by LETSJET on topic Rebuilt RD250 won't start

Shot of starting fluid
18 Oct 2019 17:48 #4

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

  • Posts: 9700
  • Likes received: 3950

Replied by RT325 on topic Rebuilt RD250 won't start

What MarkT said.
18 Oct 2019 19:45 #5

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

  • Posts: 1052
  • Likes received: 662

Replied by shyted on topic Rebuilt RD250 won't start

Yes me too,i have made that mistake years ago.
Just in case you haven't i'd like too add to that, my RD was a brand new bike at the time and broke down twice within two days of ownership. Why? Because the plugs weren't gaped. 0.8mm if my memory serves me right. Don't assume the plugs are pre gaped,they aren't.
Keep us posted.
regards Ted
Last edit: 19 Oct 2019 02:22 by shyted.
19 Oct 2019 02:15 #6

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

  • Josepromano
  • Josepromano's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 4
  • Likes received: 0

Replied by Josepromano on topic Rebuilt RD250 won't start

I correctly re-gapped the spark plugs. And messed with the idle and mixing screws. The bike started but quickly died. So I'm thinking I got to find that carburetor sweet spot. I have DG pipes with stock air filters and carbon fiber reeds. So I might Also need to figure out the best jet sizes for my set up.
23 Oct 2019 18:14 #7

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

  • Posts: 1052
  • Likes received: 662

Replied by shyted on topic Rebuilt RD250 won't start

Well at least now you're heading the right direction Jose.
Regards Ted
24 Oct 2019 04:11 #8

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

  • Josepromano
  • Josepromano's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 4
  • Likes received: 0

Replied by Josepromano on topic Rebuilt RD250 won't start

There is something wrong going on though.. Every third or fourth time I try and kick it over , there's like a pressure build up and a loud backfire Pop comes shooting out the pipes. Before it starts.? That dosnt seem normal. Any ideas about that situation?
24 Oct 2019 05:27 #9

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

  • Gr8uncleal
  • Gr8uncleal's Avatar
  • Away
  • Site Supporter
  • Site Supporter
  • Posts: 4014
  • Likes received: 1952

Replied by Gr8uncleal on topic Rebuilt RD250 won't start

Timing?
24 Oct 2019 06:54 #10

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

Moderators: yamadmin, Makotosun, DEET, Vinnie, James Hart