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Help ZXR250 Issue after issue

Discussion in 'Kawasaki 250cc In-line 4's' started by Bulleyboy91, Jan 9, 2016.

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  1. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    If you have any aerostart or start ya bastard, just give it a little sniff through each throttle body and it should get going.

    Check your pilot mixture screw adjustments, the critical part is that they are all the same amount of turns out to start with, and not too lean/too rich. Otherwise you get hard starting (lean), stalling or revs rising on their own when you crack the throttle (rich), or a lumpy idle (uneven setting of mixture screws)
     
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    Linkin, Jan 16, 2016
    #21
  2. Bulleyboy91

    Bulleyboy91 Active Member

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    now just to make sure these facts are correct;
    pilot screw 2.5 -+.5
    air mixture screw 2.5 -+.25
    float 13 -+2

    other jets are just tight not too tight?
    any other suggestions?
     
    Bulleyboy91, Jan 17, 2016
    #22
  3. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    There is no air mixture screw. The other screws are the carp sync screws. There's a couple of how to's by myself in the zxr250 section that may help you.
     
    Th3_Huntsman, Jan 17, 2016
    #23
  4. Bulleyboy91

    Bulleyboy91 Active Member

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    heres a vid,

     
    Bulleyboy91, Jan 18, 2016
    #24
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Jan 18, 2016
    #25
  6. Bulleyboy91

    Bulleyboy91 Active Member

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    no i haven't done that yet.. I'm going to trim the cables and make sure the spark plugs are clean tomorrow.. fingers crossed it will work!
     
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    Bulleyboy91, Jan 18, 2016
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  7. Bulleyboy91

    Bulleyboy91 Active Member

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    Finally some more troubleshooting which has found some problems.. found out that i had no spark coming out of 2 of my spark plugs.. tested plugs which all working good. looks like I'm going to get some new park plug leads! fingers crossed their will be life soo to this little beaut! Cheers for all your tips and help! when i get this beast running ill donate some moneys! =)
     
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    Bulleyboy91, Jan 19, 2016
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  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Jan 19, 2016
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  9. Bulleyboy91

    Bulleyboy91 Active Member

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    Cheers for the tip grey! yeah i think i will make my own because they are expensive! I'm not even going to attempt to fix them as i have no idea where they are broken!
     
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    Bulleyboy91, Jan 19, 2016
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  10. mishdog20

    mishdog20 Active Member

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    Do these run twin coil packs mate? strange that you have lost 2 all of a sudden. If renewing the leads it might pay to check the coils...
     
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    mishdog20, Jan 19, 2016
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  11. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Which cylinders are not firing? If the bike runs 2 cylinders off 1 coil (so you only have 2 coils), and you have cylinders 1/4 or 2/3 not firing, you have a dud coil. Highly unlikely that 2 leads would fail at the same time.

    Check the temperature of your exhaust headers when the bike is running or just after you kill the engine.

    I would also pull off the carbs and just check that there is no fuel accumulating in the intake ports. That will foul plugs, make a cylinder run colder, and if really bad could hydrolock the engine and/or bend/break things, like conrods...
     
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    Linkin, Jan 19, 2016
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  12. Bulleyboy91

    Bulleyboy91 Active Member

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    Just an update! I got a mechanic friend round to look at the bike.. he was being a big head about the bike saying he could fix it! ended up snapping a spark plug without noticing.. then he bailed... so i now have the thread of a spark plug stuck in the bike, rest of the spark working, starter working but still no start.. kinda think i have narrowed it down to fuel and vacuum.. its gonna be a while till it starts again. =(
     
    Bulleyboy91, Jan 21, 2016
    #32
  13. Bulleyboy91

    Bulleyboy91 Active Member

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    So got this sucker out!!! didn't take very long so i also got the carbs out! Got a question regarding the pilot and air mixture screw.. soo I've done the pilot screw 2.5 turns but how many for air mixture?

    16472-99c02af3f9a6d192bc41f0938effe9b5.jpg 16473-1bb79e5d1e842ec7f4dfcb7a253351cb (1).jpg
     
    Last edited by a moderator: Jan 22, 2016
    Bulleyboy91, Jan 22, 2016
    #33
  14. kiffsta

    kiffsta Senior Member

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    the one marked pilot jet should not be adjusted, its just screwed in all the way ( but not too hard). The only adjustment is the one you have marked as the idle mix screw, the manual calls that your pilot screw and it controls your air to fuel mixture , it should be set 2.5 turns out +/- 1/4 of a turn
     
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    kiffsta, Jan 22, 2016
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  15. Bulleyboy91

    Bulleyboy91 Active Member

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    cheers kiffsta just reading heaps about different carbs and all saying something different! =)
     
    Bulleyboy91, Jan 22, 2016
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  16. kiffsta

    kiffsta Senior Member

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    Make sure each of the pilot jets are clean and you can see through them
     
    kiffsta, Jan 22, 2016
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  17. zixxer

    zixxer Well-Known Member

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    the idle screw will vary between bikes, you will have to mess with it abit until you get a perfect idle and to make sure the revs dont hang.
     
    zixxer, Jan 23, 2016
    #37
  18. Bulleyboy91

    Bulleyboy91 Active Member

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    ok so carbs are good! got strong spark, but now i recon it could be timing so I'm gonna have to learn how to do that! really happy with the progress. if you don't ride your bike for a while would timing go out?
    thanks for all your help!
     
    Bulleyboy91, Jan 23, 2016
    #38
  19. Willrcr15

    Willrcr15 Well-Known Member

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    It won't be timing, it doesnt get out like that.
    Are your plugs wet or dry when you take them out after an attempted start ?
     
    Willrcr15, Jan 23, 2016
    #39
  20. Bulleyboy91

    Bulleyboy91 Active Member

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    tiny bit oily/fuel on the top.
     
    Bulleyboy91, Jan 23, 2016
    #40
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