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hard if not no starting

Discussion in 'Yamaha 250cc In-Line 4's' started by jamie m, Jul 25, 2012.

  1. jamie m

    jamie m New Member

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    my 3ln is a mission to start sometimes doesnt. Have cleaned carbs changed gas and plugs still the same used easy start just backfired and set off the dogs barking next door. please help
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    jamie m, Jul 25, 2012
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  2. Trev084

    Trev084 Active Member

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    What does it run like once started?
     
    Trev084, Jul 25, 2012
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  3. jamie m

    jamie m New Member

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    crap until warmed up after like 3 mins. just sounds like its flooding itself.
     
    jamie m, Jul 25, 2012
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  4. jamie m

    jamie m New Member

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    sorry once its warmed up it runs well just once its started it runs awful untill warming up.
     
    jamie m, Jul 25, 2012
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  5. Viper

    Viper New Member

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    I have the opposite problem once it gets really hot and then I try to start it again after stopping for 5 kind to go to a shop or something it will start without a problem but I have to hold the throttle fully open and it stays at a low extremely rough idle as soon as I let go of throttle it dies. I can push start it though and she goes like a rocket
     
    Viper, Jul 26, 2012
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  6. dave

    dave Well-Known Member

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    Just a general guide -

    If starts/runs ok when hot but and hard to start cold then probably running lean and perhaps choke not working properly.

    Hard to start when hot - either running too rich, or poor compression when engine hot.
     
    dave, Jul 29, 2012
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  7. dontz125

    dontz125 Active Member

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    Adding to Dave's comments above - The FZRs were notorious for hard cold-starting when the valve clearances tightened up, as poor-sealing valves dumped the compression.
     
    dontz125, Aug 13, 2012
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