/ Register

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Help ZXR250 idle issues... (another one)

Discussion in 'Kawasaki 250cc In-line 4's' started by DanoHosko, Dec 7, 2019.

Page 3 of 4
  1. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

    Messages:
    10,929
    Likes Received:
    6,713
    Trophy Points:
    1,168
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Between a Rock and a Hard Place
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Yamaha FZR400 *Triumph Bonneville 750 T140V *Triumph Daytona 675 *Triumph Tiger 800XC
    Not a gap filler ?? .... o rings are used to seal fuel,water, oil and wateva else in a zillion situations but they wont seal a bit of air thats not even under pressure?? :lolsign:

    :commando:


    Also note that if they are the correct set they will more than likely be numbered for each cylinder .... cylinder 1-4 is left to right
     
    Last edited: Apr 15, 2020
    GreyImport, Apr 15, 2020
    #41
  2. jmw76

    jmw76 Well-Known Member

    Messages:
    1,156
    Likes Received:
    585
    Trophy Points:
    498
    Joined:
    Mar 12, 2017
    Gender:
    Male
    Location:
    Melbourne, Australia
    My Bike:
    Honda cbr250rr mc22 road + 1 track, Honda RC 162 tribute bike, Honda Spada Vt250, Honda CBR900RR
    Clarification, if the o rings are compressed or damaged at all they will not seal well. Yes, used in thousands of applications, but they still can leak. -15psi (vacuum) in the manifold. So, yes they are under pressure. Air is a lot less viscous than water and oil so even small leaks can be quite significant. You do not need much of a leak to upset the idle characteristics of your engine.
     
    jmw76, Apr 15, 2020
    #42
  3. TonyZXR

    TonyZXR Well-Known Member

    Messages:
    447
    Likes Received:
    260
    Trophy Points:
    273
    Joined:
    Apr 17, 2018
    Gender:
    Male
    Location:
    New South Wales
    My Bike:
    GPX250, ZXR250A, ZXR250C
    Also something to add that i havent seen mentioned yet is check the condition the clamps, they do stretch from being tightened and loosened , even with new manifolds it'll still suck in air if the clamps dont tighten hard enough

    Sent from my SM-N960F using Tapatalk
     
    • Like Like x 1
    TonyZXR, Apr 15, 2020
    #43
  4. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    I'll be honest, im leaning towards just biting the bullet and getting new ones so i can rule it out

    Good point i didnt even think about the clamps either

    Part number is 92170-1094, local Kawasaki says "part not found' on their system apparently
     
    Last edited: Apr 15, 2020
    DanoHosko, Apr 15, 2020
    #44
  5. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    Ok today im attempting to sync the carbs, so far having big headaches and i imagine the neighbour's aren't happy either....

    At one point cycl 3 was pulling more than the others but the idle was probably the best it ever been, tried to adjust but when 3 stopped pulling so hard the idle went sky high again

    Im probably going to re-bench sync again then try this sync with the makeshift manometer, think ive probably messed it too far now
     
    DanoHosko, Apr 25, 2020
    #45
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    5,107
    Likes Received:
    3,473
    Trophy Points:
    1,148
    Joined:
    Dec 23, 2012
    Gender:
    Male
    Location:
    Thailand
    Home Page:
    My Bike:
    Yamaha FZR400 3TJ1, Honda MC22
    Buy a Morgan Carbtune, my two cents.
     
    • Agree Agree x 1
    maelstrom, Apr 25, 2020
    #46
  7. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

    Messages:
    4,733
    Likes Received:
    2,874
    Trophy Points:
    943
    Joined:
    Mar 18, 2014
    Location:
    Sydney NSW
    My Bike:
    FZR250R 3LN6
    I'd suggest the threebond engine conditioner treatment and then re-attempting the balance job. Mixture screw setting is important, to find each cylinders happy place and then do the balance... If the balance reads good and the idle goes high that's good, adjust your idle down and enjoy a smoother running, more powerful, more fuel efficient ride.
     
    Linkin, Apr 25, 2020
    #47
  8. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    I would like to but damn im getting reluctant to buy more tools at the moment, i imagine it could be a few weeks wait for one to be delivered at the moment too, might bite the bullet yet


    I'll be honest, not sure how to get the mixtures right per carb without getting it idling ok, seems like i need the mixture and the sync right but not sure how i know which is the true problem

    I set them all to 2 1/2 turns after rebuild
     
    DanoHosko, Apr 25, 2020
    #48
  9. TonyZXR

    TonyZXR Well-Known Member

    Messages:
    447
    Likes Received:
    260
    Trophy Points:
    273
    Joined:
    Apr 17, 2018
    Gender:
    Male
    Location:
    New South Wales
    My Bike:
    GPX250, ZXR250A, ZXR250C
    Doesn't help that the mixture screws are in such a **** spot, very specific screwdriver is needed. +1 for the morgan carbtune , such a good tool
     
    • Agree Agree x 1
    TonyZXR, Apr 25, 2020
    #49
  10. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    Ok sweet, im happy, starts first time, idles at 2k, carbs seem to be synced with each other,
    Good enough to get the roadworthy anyway


    Few things to take away from today:
    - Good bench sync is a must
    - the tiniest adjustment is required when syncing with the manometer to make a change
    - i have adjusted the mixture out a little


    :party:



     
    • Nice Work Nice Work x 2
    Last edited: Apr 25, 2020
    DanoHosko, Apr 25, 2020
    #50
  11. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    Sorry guys, im stuck again

    Bike has decided not to start at all today
    Turns over and i have spark to the coils (havent checked the spark plugs themselves as i used a spare to test but the others should be near new)

    Shouldn't be any changes to the airlines or vacuum lines

    The fuel tank wasnt installed so i connected up and set fuel tap to prime for probably 5-10 mins

    Battery measures 12.7V after a fair few starts this dropped to around 12.5V

    Is there a trick to priming them?
    Is the battery knackered?


    I very nearly threw my toys out the pram...
     
    DanoHosko, Apr 27, 2020
    #51
  12. TonyZXR

    TonyZXR Well-Known Member

    Messages:
    447
    Likes Received:
    260
    Trophy Points:
    273
    Joined:
    Apr 17, 2018
    Gender:
    Male
    Location:
    New South Wales
    My Bike:
    GPX250, ZXR250A, ZXR250C
    Should just be fuel tap on prime for 30 secs then switch to on , choke on full , no throttle should start straight away.

    Sent from my SM-N960F using Tapatalk
     
    TonyZXR, Apr 27, 2020
    #52
  13. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    Over the weekend i reassembled and it was starting perfectly, no throttle and without choke still started
    Today after fixing the headlights its playing up haha

    Maybe the coil leads are funked but giving a weak spark?
     
    DanoHosko, Apr 27, 2020
    #53
  14. TonyZXR

    TonyZXR Well-Known Member

    Messages:
    447
    Likes Received:
    260
    Trophy Points:
    273
    Joined:
    Apr 17, 2018
    Gender:
    Male
    Location:
    New South Wales
    My Bike:
    GPX250, ZXR250A, ZXR250C
    Doubt it, usually just causes missfires but wouldn't hurt to replace them. If it starts without choke you have the pilots a bit too rich.

    Sent from my SM-N960F using Tapatalk
     
    TonyZXR, Apr 27, 2020
    #54
  15. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    I'm still skeptical of replacing electrical things as it was literally perfect yesterday, only things thats really changed is i fixed up the headlights to work and put the fuel tank on (had been using an old coke bottle with fuel)
    Fuel tank lid is open

    I wouldn't rule out the battery as it has had a bit of a hammering this weekend but i stuck it on charge overnight
     
    DanoHosko, Apr 27, 2020
    #55
  16. TonyZXR

    TonyZXR Well-Known Member

    Messages:
    447
    Likes Received:
    260
    Trophy Points:
    273
    Joined:
    Apr 17, 2018
    Gender:
    Male
    Location:
    New South Wales
    My Bike:
    GPX250, ZXR250A, ZXR250C
    Does the fuel tap let fuel flow through on prime?

    Sent from my SM-N960F using Tapatalk
     
    TonyZXR, Apr 27, 2020
    #56
  17. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    Yeah bud, free flows on prime
     
    DanoHosko, Apr 27, 2020
    #57
  18. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    I'll stick the car battery on her tomorrow so i can rule out battery issues if it still struggles
     
    DanoHosko, Apr 27, 2020
    #58
  19. ShaneP

    ShaneP Well-Known Member

    Messages:
    2,574
    Likes Received:
    1,101
    Trophy Points:
    798
    Joined:
    May 12, 2014
    Gender:
    Male
    Location:
    Yeppoon
    My Bike:
    Yamaha FZR250 speed bike, Yamaha YZ/WR250F, Kawasaki ZX2R, Honda VTR250, DR350 (x 3.5), a couple of prototypes and whatever else.
    Welcome to the wonderful world of carbies. If the plugs are wet (fuel) then it won't start. Pull out the plug (at least one) and check it out. These carbies overflow into the intake of the motor rather than onto the ground. If the plug is wet, crank it over while the plugs are out - be careful not to set the bike on fire. Also, how's the fuel in the tank? Fresh? Clean, no water? Vacuum line on? Tap diaphragm not leaking?
     
    • Agree Agree x 1
    ShaneP, Apr 29, 2020
    #59
  20. DanoHosko

    DanoHosko Well-Known Member Premium Member

    Messages:
    234
    Likes Received:
    92
    Trophy Points:
    228
    Joined:
    Nov 26, 2019
    Gender:
    Male
    Location:
    Brisbane, Queensland
    My Bike:
    ZXR250-C
    Haha wonderful indeed
    Ok so to update, found the plugs were soaking and fouled yesterday night, cleaned them up and got it to fire up for a few seconds
    You are bang on, engine seemed to be flooded with fuel, probably my fault leaving it on prime for like 10 minutes and cranking it over how ever many times...

    HT leads are worse for wear, found the rubbers damaged (jolt to the hand) on one so possibly arcing inside the plug hole rather than getting to the plug itself

    Fuel tap is new, albiet chinese it works fine and fuel is fresh

    I think theres a combination of things:

    - Battery is pretty lousy
    - fouled plugs not sparking
    - engine flooded
    - ht leads and caps are on their last legs


    Main thing is she did fire up briefly before the battery dropped to 12.4V, so CDI isn't cooked which i was concerned about haha
     
    DanoHosko, Apr 29, 2020
    #60
Page 3 of 4

Share This Page