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Im trying something new - my ZXR250

Discussion in 'Kawasaki 250cc In-line 4's' started by Tim_, Mar 22, 2014.

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  1. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    No .. u cant just swap 1 lead with 1 other ...then firing is out of order

    You have to swap the leads in tandem ..... 1 and 4 leads become 2 and 3 .... and vice versa

    The purpose in that is to elimate 1 bad coil ...if thats the case
     
    GreyImport, Apr 7, 2014
    #101
  2. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    When I tried that the bike didn't even start. It almost back fired. But nothing. Almost killed the battery.
     
    Tim_, Apr 7, 2014
    #102
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I would definatelly check the caps and leads carefully ..... if they are loose , corroded or dodgy then they would get worse as u move them about.

    Look right inside both ends of the caps ....should be shiny brass colour ...not green !

    check the leads arnt hard or split and the caps ant cracked
    look at where they join the coils
    also check the wires , connections and plugs at the other side of the coils
     
    GreyImport, Apr 7, 2014
    #103
  4. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Will do. I need to chill out ATM am pissed off so taking some time to chill and have a jack.
     
    Tim_, Apr 7, 2014
    #104
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yea good move ... it always pays to step back at times when it gets frustrating :drinks:
     
    GreyImport, Apr 7, 2014
    #105
  6. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Yeah was about ready to pour petrol on it and dance around it while cackling. Then gather the ashes compress them into a brick and drop it into a bottomless pit.

    Or I woke up at 1:30 this morning and this one jack has now made me a little loopy. But I am feeling better. Hahahaha.
     
    • Like Like x 2
    Tim_, Apr 7, 2014
    #106
  7. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    I have felt this way many times!
    when mine was dropping cylinders for no apparent reason it was carb related, after a carb rebuild and a new fuel lines, vacuum lines and a correct fuel filter (dirt bike ones dont flow fast enough) turned out i was emptying my carbs too fast for the restricted fuel line so i would run out of fuel, happened to be the centre 2 first as well (bigger jets) are you sure fuel is in those 2 carbs?

    Also if you really get stuck trouble shooting and need parts to confirm i can bring spare coils of my parts bike, or your bike can borrow my working carbs while I am there ö

    My A model is definately 1 and 4, 2 and 3.
     
    Last edited: Apr 7, 2014
    Th3_Huntsman, Apr 7, 2014
    #107
  8. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Cheers mate. It would actually make sense. Because when I did the "pull through" technique it sucked a lot more fuel into the carbi and that's when the pot fired.
     
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    Tim_, Apr 7, 2014
    #108
  9. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    After a little messing around today. It is definitely a fuel problem. I did the pull through method to the 2 middle carbs and the bike reved of its head so I quickly crouched and sprayed the all 4 headers. All of them have off lots of steam and didn't leave any water on them at all.

    Thanks huntsman you were right. The 2 middle carbs are emptying way to fast or are not getting any fuel at all but the suction is there. So I'm guessing either the vacuum line is blocked or only work half capacity. I'm going to check out your build thread and see how you got around it.
     
    Tim_, Apr 8, 2014
    #109
  10. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    Allrighty! So are all your vacuum lines in perfect condition? No cracks? Are the lines all connected underneath the carbies, the vacuum line for the fuel tap is hooked to the 1-4 carb boots and 2-3 are connected to each other.

    Have you cleaned the carbs? Could even be blocked jets? What condition is your fuel filter in? Also have fun reading my thread haha
     
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    Th3_Huntsman, Apr 8, 2014
    #110
  11. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    The carbs were cleaned but with the crap that was in the fuel tank they could use another clean.

    Here is a question. You said before the to 2 middle carbs have bigger jets making them empty faster. What if I take the 1 and 4 jets from the other broken carbs I have and put them in the 2 and 3 carbs that I have on the bike now? Wouldn't that fix the emptying problem?

    Or even get the bigger jets of the broken set and put them in the 1 and 4 carbs? Then lean the air fuel mixture screw so when I WOT (wide open throttle) it gets more fuel?
    P.s I'm new to carbi rebuilding/ tuning.
     
    Tim_, Apr 9, 2014
    #111
  12. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    No tim bad idea, it has bigger jets for a reason from the factory, try and run it with prime turned on on your fuel tap it might flow a little faster.
     
    Th3_Huntsman, Apr 9, 2014
    #112
  13. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    When carbs are cleaned , all lines should be checked or replaced, filters changed and even the petcock pulled apart and cleaned......but a definate is the tank cleaned of crud.
    Its like spending 3 hours cleaning and polishing your bike then looking for the first mud puddle to ride thru.

    If theres no fuel filter then put one in.
    Follows hunstmans advice.
    As huntsman eludes to as well u wont fix a problem by changing the stock setup.

    It was designed to run from the factory ....Japanese engineeers now alot more than any of us will ever know.
    Get everything setup to stock and cleaned the best u can and then start looking for your problem.
     
    GreyImport, Apr 9, 2014
    #113
  14. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Cheers for the advice guys. Will start my fuel journey when I receive the tank lock. I ordered it a couple weeks ago just awaiting delivery. I will start by cleaning the tank and relining it. Then the petcock. Then I will install a fuel filter with the new fuel lines. May take a couple of weeks due to budget restraints but will keep everyone posted with the progress.

    Cheers
    Tim
     
    Tim_, Apr 9, 2014
    #114
  15. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Sounds good Tim .....if youve read even some of my epic "My Fizzer" thread , I did a crapload of things to bring it up to scratch but when I took shortcuts cuz I was frustrated or just had to get it on the road for rego or wateva ..... it bit me in the ass.
    Even just little simple things and parts that I thought would be 'ok' but really should have replaced.
    Carbs were a prime example ..... looks like the emulsion tubes and/or the float needles have caused me my current problems as I didnt replace them.

    Keep at it ...you will get there :thumb_ups:
     
    GreyImport, Apr 9, 2014
    #115
  16. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Cheers mate
     
    Tim_, Apr 9, 2014
    #116
  17. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Ok so today decided to drain the fuel out of the fuel tank. So I put the petcock on prime. And the fuel flowed freely to begin with. Then 5 seconds after it slowed down to a trickle and stopped. I had to swap it to res then back to prime to start the flow again. Is this normal or should it flow freely with the tap on prime?
     
    Tim_, Apr 9, 2014
    #117
  18. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I think on the C model the fuel runs with the assistance of the vacuum line that goes to the tap on one (think its prime? ) and on the other it flows by itself .
     
    GreyImport, Apr 9, 2014
    #118
  19. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Same thing as the A. And MC22. They have a vacuum pump. So if there is no vacuum there is no pump. But prime should flow freely because it is meant to prime the carbs with fuel before starting the bike. So it wouldn't need the assistance of the vacuum line. Yes? This is me thinking out loud. I maybe wrong.
     
    Tim_, Apr 9, 2014
    #119
  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I think thats how I wrote my post then changed it!
    Not much logic in my head at present :lolsign:

    Your version sounds right to me ...?

    I would pull apart the petcock and check and clean it .... if its off the tank its a good way to clean the internal filters as well

    A model petcock.png
     
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    GreyImport, Apr 9, 2014
    #120
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