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Help ZXR250c ignition timing?

Discussion in 'Maintenance' started by cantafforda600, Jul 26, 2015.

  1. cantafforda600

    cantafforda600 can actually afford a 600 Premium Member

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    so since i got my zxr i've redone the wiring and confirmed that all 4 leads are delivering spark, i've replaced two broken spark plugs so that all four are now sparking properly, i took the entire engine apart today to have a look at the piston rings and cams and valves and stuff and everything seems to be all good. turned out the previous owner had completely misaligned the camshafts but i fixed that

    now she is ever so close to starting up, but still backfiring when i try to start. did come very close to firing up tonight after i'd put the engine back together though

    all i can think of that could be wrong at this point would be the spark plugs going a little too soon or too late, is there any way of adjusting the ignition timing on the zxr like you would on an old car with a distributor cap? otherwise what do you guys think i could have missed that would get the engine going?

    thanks
     
    cantafforda600, Jul 26, 2015
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  2. kiffsta

    kiffsta Senior Member

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    It's not adjustable , are your plugs in the right order ?
     
    kiffsta, Jul 26, 2015
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  3. cantafforda600

    cantafforda600 can actually afford a 600 Premium Member

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    they're in the order they were in when i got the bike (could be wrong though considering all the other things the last owner left incorrect)

    here's a very professional representation of how my plugs currently are plugs.png
     
    cantafforda600, Jul 26, 2015
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  4. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    On the FZR's that would be wrong. Cannot say for ZXR. On the FZR, each coil pack does 1 left and 1 right. Eg, coil pack 1 does cylinder 1 and 3, coil pack 2 does cylinders 2 and 4. Am I making sense?

    Swap 1 plug lead from each coil pack and try again.
     
    Linkin, Jul 26, 2015
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  5. cantafforda600

    cantafforda600 can actually afford a 600 Premium Member

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    i suspect it may be wrong since the pistons in cylinders 1+4 as well as 2+3 are synchronised on this bike, so if one coil gives power to both of its leads at the same time (which seems logical to me) then one coil would be to 1 and 4, and the other to 2 and 3

    are the pistons like that on the fzr too?
     
    cantafforda600, Jul 26, 2015
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  6. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Just swap the leads on cyl 2 & 3 and see if it starts. If it does, no point in wondering why :thumb_ups:
     
    Linkin, Jul 26, 2015
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  7. Phil

    Phil Senior Member Contributing Member

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    Looking at your drawing
    -coil pack no.1.....1st lead to cylinder 4
    -coil pack no.1.....2nd lead to cylinder 1

    -coil pack no 2.....1st lead to cylinder 2
    -coil pack no.2.....2nd lead to cylinder 3

    cylinder no's go from left to right 1st cylinder is 4...next is 3.....then 2 and finally the cylinder on right hand side is no.1
    The way you've drawn it, the bike will no fire. Hope this helps
     
    Phil, Jul 26, 2015
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  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    eeek
    Sitting on the motorcycle, Cyl 1 is on the left, then 2, 3, 4.
    1&4 are one coil and 2&3 the other.
    Image from the ZXR400
    ZXR400_Coils.jpg
     
    maelstrom, Jul 26, 2015
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    and here is the ZXR250 ignition circuit diagram
     

    Attached Files:

    maelstrom, Jul 26, 2015
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  10. cantafforda600

    cantafforda600 can actually afford a 600 Premium Member

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    thanks guys, will see if i can finally get it to start up tomorrow
     
    cantafforda600, Jul 26, 2015
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  11. Phil

    Phil Senior Member Contributing Member

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    Sorry mate, my bad. Cylinders are starting on left 1-2-3-4. My caps have a tag with a number attached and that's what I could see in the dark. This morning checked my zzr 600 manual......Blair is correct.
     
    Phil, Jul 27, 2015
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