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Help FZR250 2kr won't start

Discussion in 'Yamaha 250cc In-Line 4's' started by amdeleon11, Apr 19, 2019.

  1. amdeleon11

    amdeleon11 Active Member

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    okay i'm stumped. cleaned carb, replaced the tci, ignition coil, coil plugs, fuel pump, fuel pump relay, new spark plugs, and my 2kr still wont run. any ideas? it seems like it's gonna start at some point but it doesn't continue.

    i tried bump starting it, it will fire for a sec then it will die. it also backfires sometimes. when cranking/bump starting.
     
  2. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Is the fuel flow after the fuel tap OK? Is the fuel fresh?

    Exhaust headers getting hot as you crank it over? A cold exhaust indicates it's not firing
     
  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Intake manifold's are cracked. use some windscreen urethane to try and seal them up until you can find some new one's
    Remove the rubber intake's and smear the urethane all over them, might buy you a bit of time
     
  4. amdeleon11

    amdeleon11 Active Member

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    yup the exhaust gets hot and i removed the hose from the carb and there is fuel. it's not new fuel though might have to check that but when i bump start it, it fires up a bit then dies. and i noticed when i blip the throttle while cranking it it wants to fire up more but doesnt continue.
     

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