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Help Carb balancing

Discussion in 'Maintenance' started by Anne K, Aug 9, 2020.

  1. Anne K

    Anne K Member

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    Hey Folks, so.. I’ve replaced the shims, throttle cable and stripped and lined the tank on my Yamaha fzx250 zeal.
    When I start the bike with the choke out fully it isles at around 4K, when I bring the choke back halfway revs go back to around 1600. As soon as I give it any throttle or push in the choke the engine cuts out (It was doing this before I replaced the shims and other parts).
    I’m assuming the carbs need balancing? Is there anything else I should be looking or listening for?
     
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  2. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Maybe richen up the idle screws by 1/4 turn to help with the cold idle.
     
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    What Murdo said. Mixture screws are set for a hot engine and it might be a bit cold where you are, so give it some time to warm up. Well done for getting this far and you are right about the carb balance. I wrote a guide for doing mixtures by ear but it is not easy https://litetek.co/Guide_FuelScrews.html. But you can find what works for your bike by trial and error.
     
  4. Anne K

    Anne K Member

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    Is there a way to balance with the carbs out?
     
  5. Anne K

    Anne K Member

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    I might just get a motion pro carb sync tool
     
  6. Andych

    Andych Senior Member Premium Member

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    You can certainly sync the carbies off the bike but you will still need to do a fine tune with them once back on the bike.
    If you are going to fork out for a Sync tool I would take a look at the SynchroKing.
    It is Aussie made and while a little more expensive that you may be able to get the Motion Pro for I believe it would be a better investment... Just my opinion though.
    https://raytechautomotive.com/products/synchroking-4s-mkii
     
  7. Anne K

    Anne K Member

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    Thanks heaps for sharing, motion pro was more expensive than this surprisingly.
    I’m a tad disappointed the synchroking didn’t pop up when I googled carb sync tool Australia! I just ordered one, love that it comes with a pouch for storage.
     
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  8. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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  9. Andych

    Andych Senior Member Premium Member

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    That’s a 2 column tool. 4 column would be more expensive and I don’t know that much is coming into Aus from the UK at the moment.


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  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Search 'bench sync' or 'carb sync' here on the forum

    I bench synced my FZR carbs years ago and they have been fine ..... well, sync wise anyway :D

    We will see as I ordered a load of parts today from the UK.... Ive been told alot is coming by sea as what aircraft are running are filled to capacity with freight

    order.png
     
    Last edited: Aug 10, 2020
  11. Anne K

    Anne K Member

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    Is carb 1 the preset one? (Excuse my lack of correct terminology)
     
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  12. Andych

    Andych Senior Member Premium Member

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    Yep, freight is all over the shop right now. I am waiting on a couple of decals from a guy in Spain and they are not even sending Postal items to Australia right now.
    Sea Freight- ouch, that is 6 weeks plus clearance etc from Europe. Bummer


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  13. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    No ... on the FZR Mikunis carb#2 is your base carb

    So u sync 1 to 2 ... then 3 to 2 , then 4 to 3 .... I think ? ... its been awhile :lolsign:
     
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  14. Anne K

    Anne K Member

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    I’m waiting on a clutch cable and fuel filter form Yamaha Japan, it’s been 4 weeks.. likely to be another 2-3
     
  15. Andych

    Andych Senior Member Premium Member

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    Could be longer Anne. EMS are not shipping to Australia and I know that Yamaha are waiting on lots of imports with no firm delivery date.


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  16. Anne K

    Anne K Member

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    I did find a work around with freight from Japan. Head cover gasket, seller offered to send via UPS.. costs a little more and not everyone will offer this but it arrived within 4 days.
     
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  17. Andych

    Andych Senior Member Premium Member

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    Yep, I had some gear come from Japan via UPS. Wasn’t too bad compared to EMS.
    Hope your gear arrives quickly.


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  18. DannoXYZ

    DannoXYZ Well-Known Member

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    Note that carb-sync is not related to your issue of dying when you open throttle.
     
  19. Anne K

    Anne K Member

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    Thanks @DannoXYZ I hadn’t let the bike warm up
     
  20. Anne K

    Anne K Member

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    Since I have a few days to spare before the sync tool arrives I might as well clean the carbs, any tips? Also, I don’t have an air compressor.



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