1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Project SR250 scrambler

Discussion in 'Your 250cc Projects' started by Canada_Dry, Aug 22, 2020.

  1. Canada_Dry

    Canada_Dry Active Member Premium Member

    Messages:
    31
    Likes Received:
    15
    Trophy Points:
    178
    Joined:
    Jul 8, 2020
    Gender:
    Male
    Location:
    Geelong, Victoria AU
    My Bike:
    83 GSX250
    Hey guys. I picked this up yesterday after finishing my Suzuki flip.

    first impressions:

    I paid way too much
    this bike is so small!
    Stupid Covid made it so I couldn’t see in person before buying

    excited for the challenge!


    New battery installed. I turn the key over and can measure 12v going through the ignition but I get no lights and basically nothing works.

    I put 12v to starter and it does turn over

    Any tips?



    D7F11DE5-3917-45CF-9AD0-E4410FA9E1D8.jpeg CCC8E3CD-1728-4C37-86E4-2E78514558EA.jpeg 1D5C05BD-4D2D-4F9F-8BA3-79F9C61816A3.jpeg
     
  2. Canada_Dry

    Canada_Dry Active Member Premium Member

    Messages:
    31
    Likes Received:
    15
    Trophy Points:
    178
    Joined:
    Jul 8, 2020
    Gender:
    Male
    Location:
    Geelong, Victoria AU
    My Bike:
    83 GSX250
    Elec tray and battery mount done. Do you think it will be roadworthy?

    3763AD0D-A6FE-4218-8AF9-5424AAEB3B95.jpeg C5D0A7CC-6FCC-47B5-8088-B91EA2D22686.jpeg 5014CACF-9B14-46B0-B97F-461279664B0B.jpeg 5E956501-998E-4554-8FD5-0D26419D6197.jpeg
     
  3. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

    Messages:
    4,291
    Likes Received:
    2,508
    Trophy Points:
    918
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Albury 2641
    My Bike:
    1987 Yamaha SRX250, Honda 1974 SL125 K1, 2022 Triumph Tiger Sport 660
    Why not do what most people do when they are going in this direction.... get a high capacity antigravity battery and put it in the same tray as the electrics. Far neater and much safer... that battery position most likely wont pass roadworthy inspection and is prone to damage.
     
    • Agree Agree x 3
  4. Canada_Dry

    Canada_Dry Active Member Premium Member

    Messages:
    31
    Likes Received:
    15
    Trophy Points:
    178
    Joined:
    Jul 8, 2020
    Gender:
    Male
    Location:
    Geelong, Victoria AU
    My Bike:
    83 GSX250
    Hi Andy, yes it’s looking more and more that direction as I just got a rear brake assembly and it’s in the way again. Got the bike running but it idles like crap after carb rebuild and air/fuel adjustments. I think it needs bigger jets with exhaust/intake.
     

    Attached Files:

  5. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

    Messages:
    4,291
    Likes Received:
    2,508
    Trophy Points:
    918
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Albury 2641
    My Bike:
    1987 Yamaha SRX250, Honda 1974 SL125 K1, 2022 Triumph Tiger Sport 660
    Good possibility it doesnt need bigger jets. You really need to look at your plugs (colour) and do some investigation... the assumption that you need to go larger is often wrong.
    It could be your intake air velocity it not high enough to get the required fuel, could also be the increased airflow into each carby has too much fuel going through... lots of different permutations and just going up in jet size will most likely have you forever chasing your tail in trying to tune it up.
    Pods on a bike are generally EVIL...
     
    • Agree Agree x 2
  6. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

    Messages:
    4,736
    Likes Received:
    2,879
    Trophy Points:
    943
    Joined:
    Mar 18, 2014
    Location:
    Sydney NSW
    My Bike:
    FZR250R 3LN6
    With carbs, inreased airflow also means increased fuel. Good call on on the velocity, too. I was working on an RS125 with a HUGE carb and massive jets and it barely ran... solution from the head mechanic at my old job = larger jets...
     
  7. Canada_Dry

    Canada_Dry Active Member Premium Member

    Messages:
    31
    Likes Received:
    15
    Trophy Points:
    178
    Joined:
    Jul 8, 2020
    Gender:
    Male
    Location:
    Geelong, Victoria AU
    My Bike:
    83 GSX250
    Well guys.... I got this far!


    Still having massive issues with getting it running :/ so sad as I wanna ride it and then find a buyer!!

    symptoms are running super rich no matter how small I jet the pilot circuit. If I can get it idling it wants to die with any throttle blip unless I gun it and it goes to 4-5k rpm then it responds ok (Parked)

    I’ve got a whole keyster carb kit. Have tried all 3 pilot jet sizes with every position of air fuel screw. Diaphram is working. Float level is perfect. I’m dying to get to the bottom, what other issues could cause this besides carb I’m wondering.

    cheers,

    dylan.
     

    Attached Files:

  8. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    4,313
    Likes Received:
    2,383
    Trophy Points:
    898
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's , 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G, 1976 IT400C 510
    Here's how not to fix the carby, haha
    He does show where most pod filter's block off the pilot and main air feed's though





    I have seen people getting them running by taping up half or more of the pod filter to restrict the airflow in, this will cause the problem to move to different throttle position's and make other problems though
    Same thing with fitting a tube inside the pod filter to retrict it


    I think you'd be much better off fitting a Mikuni VM roundslide carb to it, they're a lot easier to tune for pod's
    Even look for an OKO PWK flatslide, they make the bike more interesting to ride
     
    • Agree Agree x 2
  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    5,108
    Likes Received:
    3,477
    Trophy Points:
    1,148
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    CV carb and pod filter = waste of time.
    As for the 'My cafe runs perfectly with pods' crowd, show us the before and after on the dyno and we will believe it otherwise not a chance.
    Solution is what @my67xr said, fit a normal slide carb and jet it. Mikuni VM is cheap.
     
    • Agree Agree x 2
    • Like Like x 1
  10. Canada_Dry

    Canada_Dry Active Member Premium Member

    Messages:
    31
    Likes Received:
    15
    Trophy Points:
    178
    Joined:
    Jul 8, 2020
    Gender:
    Male
    Location:
    Geelong, Victoria AU
    My Bike:
    83 GSX250
    I put on a VM34 and bingo works great
     

    Attached Files:

    • Like Like x 1
  11. Canada_Dry

    Canada_Dry Active Member Premium Member

    Messages:
    31
    Likes Received:
    15
    Trophy Points:
    178
    Joined:
    Jul 8, 2020
    Gender:
    Male
    Location:
    Geelong, Victoria AU
    My Bike:
    83 GSX250
    Where is best place to sell in AU? I’m in Victoria it’s good to go
     
  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    5,108
    Likes Received:
    3,477
    Trophy Points:
    1,148
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    Good for you. I have said this many times and you are the first one to actually do it.
     
    • Like Like x 1

Share This Page