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Project SR250 scrambler

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

  1. Canada_Dry

    Canada_Dry Member Premium Member

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    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?



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  2. Canada_Dry

    Canada_Dry Member Premium Member

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    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 Senior Member Premium Member

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    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.
     
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  4. Canada_Dry

    Canada_Dry Member Premium Member

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    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.
     

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  5. Andych

    Andych Senior Member Premium Member

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    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...
     
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  6. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    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 Member Premium Member

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    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.
     

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  8. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    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
     
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    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.
     
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  10. Canada_Dry

    Canada_Dry Member Premium Member

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    I put on a VM34 and bingo works great
     

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  11. Canada_Dry

    Canada_Dry Member Premium Member

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    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

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    Good for you. I have said this many times and you are the first one to actually do it.
     
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