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Project FZR fix up

Discussion in 'Your 250cc Projects' started by Yetiburger, Oct 7, 2017.

  1. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    OK so went to work on the bike today and cylinders 1 and 4 weren't firing. i pulled the plug for that coil and no change. s o I pulled it out and checked it. the secondary was good at 15k ohms but the primary was 3.8 ohms instead of 2.8. would that be causing the problem?
     
  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Too much primary resistance in the ignition coil will draw a low more amp's through the TCI.
    Sometime's this can cause the Darlington resistor to fail inside the TCI, so best off not running it with that coil
     
  3. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    would that explain why 1 and 4 aren't firing? I about 1 to 2 volts to the coil. which is the same as the one thats working. Could the TCI be faulty?
     
  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Coil's should have around 12v on the powered side with the ignition turned on (red wire's with white stripe)
    Have you tried swapping the wire's over from coil's 2/3 and 1/4 to double check it is that coil
     
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  5. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    yeah ok i switched the coils round and had a play i'm 99% sure its the coil.
     
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  6. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    can new ones be sourced from anywhere?
     
  7. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    also I am trying to pull my calipers apart to get the bike ready for a brake cert. The pistons are really sized in the calipers does anyone have a trick for removing them?
     
  8. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    Usually they will all make their way out eventually, I used to put some metal flat bar between the freed ones and pump the lever - once the freed ones had met the resistance of the metal bar the remaining ones would shift eventually.

    This would depend on your brake system still being intact and free from air - mistake I made the first time was opening the brake system - bleeding it back clear was a PITA

    hope this helps
     
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    Last edited: May 20, 2018
  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Try using a grease gun on the bleed nipple to pump them out,
    You'll need to block off the inlet to the caliper with a suitable bolt.
     
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  10. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    ohk aren't they like an SAE thread?
     
  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    There are no imperial threads on your Yamaha.
     
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  12. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    UNLESS some numpty has been in there and replaced bolts with whatever they had lying around
     
  13. Mike Fulcher

    Mike Fulcher Active Member Premium Member Contributing Member

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    Yes you get plenty of them, in our industry you would not believe what some people use to secure a loose cover etc, even using self tapping woodwork screws in some poor old 5/6/8mm threads, which can then only be repaired with the trusty OL Recoil thread inserts.
     
  14. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    So I had gifts from over the ditch arrive today thanks grey. Thanks for the sticker and cards. Also have managed to get the pistons out of the rear caliper (using the grease gun method). After a clean up with a scotchy there seems to be a little bit of pitting at the top. not sure if I'll need to replace them or not, will try post some good pics of them tomorrow. 20180525_164309.jpg 20180525_164312.jpg 20180525_164319.jpg 20180525_164342.jpg
     
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  15. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    whats the verdict? are these to far gone to re use?
    20180526_215014.jpg 20180526_215021.jpg 20180526_215144.jpg
     
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  16. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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  17. Murdo

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

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    To reuse them will only give trouble (leaking fluid, etc) later on, which may cost a lot more to fix.
     
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  18. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    Ok so bit of an update. exams are over now so I can finally get back into this bike. I have ordered new pads, seals and pistons for all the brake so the will be rebuilt. I also remember seeing a thread on here somewhere about somebody rebuilding they're master cylinder? does anybody know where that is? I have also purchased a second hand coil to replace my knackered one. but this is also had it. does anybody know where to source after market coils from?
     
  19. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Weird for the new coil to be dead too isn't it?
    What reading's are you getting from it ?

    You could do a coil on plug conversion to it for the price of one brand new coil
    Just find 4x good used 2008 GSXR750/1000 ignition coil's (low km's if you can find them) and some wiring socket's and a couple of length's of wire and follow the diagram instruction's here
    The Denso ignition coil part number is 129700-4400
    Otherwise try Ignitec for some new one's, just tell them the coil reading you are looking for and they might suggest some to you
    http://www.ignitech.cz/en/vyrobky/accessories/ic/ic.htm
    Price list- http://www.ignitech.cz/zdroj/en/ceniky/USD/price list accessories usd.pdf

    Post number 2 in this thread has a good diagram etc
    https://www.2fiftycc.com/index.php?threads/coil-on-plug-conversions.9631/#post-105479
     
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    Last edited: Jun 25, 2018
  20. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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