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Project FZR fix up

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

  1. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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  2. Yetiburger

    Yetiburger Well-Known Member

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    Has anybody used a homemade manometer?
     
  3. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    @my67xr did make his own so I would guess he will chip in soon and link to the posts..
     
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  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    This is one i made, i used red coloured water in it but it was a bit thin, i needed to drill some hole's so the water wasn't sucked up through the tube's (see second pic), i reckon 75wt gear oil would be better
    It was ok for getting them close, especially after trying to sync the carb's with a bit of wire, but i bought a Carbtune Pro balancer set pretty cheap secondhand, was only used once before i bought it.

    [​IMG]
    [​IMG]
     
  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Personally I think the CarbTune is the best by a long shot.
     
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  6. Yetiburger

    Yetiburger Well-Known Member

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    do you guys think some of my problems with my carbs could be due to lack of compression? Mechanic did say it was down?
     
  7. Wozza

    Wozza Active Member

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    compression is the foundation of a good running engine...If its under the lowest spec then it needs to be addressed before spending money anywhere....
     
  8. Yetiburger

    Yetiburger Well-Known Member

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    does anybody know what the specs are? the mechanics said the compression was 100 99 90 89psi. Can you just test it with a standard car compression tester?
     
  9. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    You can, but it may not be accurate. With these bikes, compression tests must be done with the throttle wide open and the slides fully lifted (or just remove the carbs).

    Those numbers, if accurate, are very low. Step one is measure the valve clearances.
     
  10. Yetiburger

    Yetiburger Well-Known Member

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    ohk I did do all the valve clearances before that test. Sombody told me the shim i was putting in was big. maybe Ive mis-measured somewhere.
     
  11. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    When you measure clearances and they are tight, you need thinner shims to get the correct clearance. If you put thicker shims in, you are decreasing clearance which will affect compression in a negative way.
     
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  12. Yetiburger

    Yetiburger Well-Known Member

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    I have a compression tester on the way so I will start there before the carbs I think.
     
  13. Yetiburger

    Yetiburger Well-Known Member

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    Does anyone have an opinion on swift chains? Are o-ring or x-ring the only way to go?
     
  14. Wozza

    Wozza Active Member

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    dont like O ring chains...I buy the standard heavy duty chains, service them regularly (which I enjoy) and they are cheaper as well
     
  15. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I've run a DID H/Duty chain for the last 3000km's,
    it cost me $32 from the local bike shop, and i've only needed to adjust it once in that time, but oiled it a lot
    I will be giving my bike a few run's at the drag's soon and i'll change it over to an O'ring chain as they're a bit stronger


    DID gold o'ring chain, 428 pitch, 136 link's
    https://www.ebay.com.au/itm/DID-Gol...793323?hash=item1a5c3f2aeb:g:jJcAAOSw2iFbfhx6

    I bought this one off ebay for around the same price


    20180925_180638.jpg
     
  16. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Chains need maintenance, that means keeping them clean. Most people just saturate the things in lube and ride away.
     
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  17. Murdo

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

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    How do you know the O ring chain is stronger?
    I will not run an O ring on my drag bike for the simple fact of the extra HP required to turn the heavier/stiffer chain.
     
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  18. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    It say's so on the spec sheet from RK
    RK O 'ring is 5500 lB'S /Foot v's 4230Lb's/Foot on the DID H/D
    I thought my FZR felt like it went better with the non o'ring chain but without comparing it on a dyno it may have just been wishfull thinking
     
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  19. Yetiburger

    Yetiburger Well-Known Member

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    So my compression tester arrived today. From what I can interpret from the manual the compression should be around 142 PSI. How low would be acceptable. I will hopefully get around to testing this weekend. 20180927_101103.jpg
     
  20. Wozza

    Wozza Active Member

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    Same kit I have be careful of the screw in adapters they dont always seal well...I use the push down rubber bung ones, but that means you need to remove the carbs or get a 3rd hand from somewhere :)
    warm the bike up remove carbs and all plugs..attach gauge, turn it over till the gauge stops climbing or 4 to 6 strokes if you cant see gauge face....
     
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    Last edited: Sep 27, 2018

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