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

Project The Fizzer Brat Project

Discussion in 'Your 250cc Projects' started by Joker, Jun 3, 2018.

  1. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

    Messages:
    7,681
    Likes Received:
    4,549
    Trophy Points:
    943
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Troublemaker
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Suzuki GSX250 *Triumph Bonneville 750 T140V
  2. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

    Messages:
    3,442
    Likes Received:
    2,008
    Trophy Points:
    943
    Joined:
    Mar 18, 2014
    Location:
    Sydney NSW
    My Bike:
    ZXR250C
    Zeal also runs 26.5mm carbs and the jetting is different
     
  3. ShaneP

    ShaneP Well-Known Member Premium Member Contributing Member

    Messages:
    1,341
    Likes Received:
    554
    Trophy Points:
    498
    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.
    Might be a solution to the fzr running issues if it is that bad without exup
     
  4. Joker

    Joker Coming and going... Premium Member Contributing Member

    Messages:
    2,701
    Likes Received:
    1,381
    Trophy Points:
    798
    Joined:
    Feb 2, 2014
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    VFR800, FZR250 3LN Brat, XV1100
    I have a motor as i sent it to my brother so all good there. Got footpegs from chris now i just need airbox, doesn't matter if filter isn't in it i guess... what do you want for it @my67xr. I have parts i could send you back if you want
     
    • Like Like x 1
  5. Joker

    Joker Coming and going... Premium Member Contributing Member

    Messages:
    2,701
    Likes Received:
    1,381
    Trophy Points:
    798
    Joined:
    Feb 2, 2014
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    VFR800, FZR250 3LN Brat, XV1100
  6. Joker

    Joker Coming and going... Premium Member Contributing Member

    Messages:
    2,701
    Likes Received:
    1,381
    Trophy Points:
    798
    Joined:
    Feb 2, 2014
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    VFR800, FZR250 3LN Brat, XV1100
    7aa11bb2fc35e76fbd0bdf44843be0aa.jpg 32403dbbd3576401ed58d5fd8386139a.jpg

    Good news, Chinese diaphragms fit not bad $30 ish for 4. See how they last I guess. These are sized for gj74a bandit.
     
    • Like Like x 2
    • Looks good! Looks good! x 1
  7. Joker

    Joker Coming and going... Premium Member Contributing Member

    Messages:
    2,701
    Likes Received:
    1,381
    Trophy Points:
    798
    Joined:
    Feb 2, 2014
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    VFR800, FZR250 3LN Brat, XV1100
    c473f1a0fccf61be6bdb4e9b51fafffa.jpg


    Sent from my iPhone using Tapatalk
     
    • Like Like x 1
  8. Joker

    Joker Coming and going... Premium Member Contributing Member

    Messages:
    2,701
    Likes Received:
    1,381
    Trophy Points:
    798
    Joined:
    Feb 2, 2014
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    VFR800, FZR250 3LN Brat, XV1100
    Engine is in, cylinder head cleaned up and valves lapped. We bled the rear brake which had been dry for who knows how long and weren't getting anywhere, so I took off the banjo bolt and pushed my finger on and off as we pressed the brake and surprisingly it started getting suction. Put it back on and kept pumping and we finally got fluid at the caliper, it held pressure and seems OK which is good. Pistons are a bit stiff though, so we'll find a way to give those a bit of a clean up without having to start again.

    Mate brought in a CBR250R front fairing and some second hand tyres that are still OK - so we'll hack the fairing up and find a way to mount it, change the tyres at some stage. Also we are in the process of setting up an electrolytic cell to remove the rust from the tank, Woolworths has this washing soda which is sodium carbonate so I think this should work well.

    Still need an air box though, I'm sure it will run without it but will be lean. We are also missing one o-ring from the top of the carburetor just under the lid. We couldn't figure out what it did though it seems to be independent of the carburetor circuit.. all the slides lift the same even with one missing. @GreyImport maybe you know? the one in the top rim just next to the diaphragm?

    The font brakes will be fun but hopefully the master cylinder will hold pressure... not holding my breath though you never know.

    43248234_2458375994189310_5509761562602110976_n.jpg 43247245_2458377020855874_733048972083462144_n.jpg 43210578_2458376937522549_2979110752410927104_n.jpg
     
    • Like Like x 1
    • Nice Work Nice Work x 1
  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    2,877
    Likes Received:
    1,672
    Trophy Points:
    798
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's, 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G
    The small o'ring on top of the carby/s is just for the vent/s
     
  10. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

    Messages:
    3,442
    Likes Received:
    2,008
    Trophy Points:
    943
    Joined:
    Mar 18, 2014
    Location:
    Sydney NSW
    My Bike:
    ZXR250C
    That small o-ring is important, I'd be finding one to put in there.
     
  11. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

    Messages:
    7,681
    Likes Received:
    4,549
    Trophy Points:
    943
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Troublemaker
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Suzuki GSX250 *Triumph Bonneville 750 T140V
    If u look in the throat of the carb , theres a hole which leads to that top opening where that o ring goes ... then if u look inside the rim of the plastic cover theres another opening ... the specific purpose of that circuit I cant remember offhand (without researching the history, specs and workings of a BDST carb) but maybe @maelstrom knows instantly :help: :D .... the o ring would obviously keep out any unwelcome air, water or passing debris
     
  12. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    2,877
    Likes Received:
    1,672
    Trophy Points:
    798
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's, 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G
    I thought it just let filtered air in above the diaphram when the slide opened?
    So i'm guessing without it there the slide may close quicker?

    But now i think about it if it's hooked up to a port that run's through to the bore then vacuum when the engine is running will suck the diaphram up and lift the slide, it'd rise more with more vacuum at higher rpm's
     
  13. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

    Messages:
    1,461
    Likes Received:
    727
    Trophy Points:
    518
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Without that o-ring the slides won't lift - the lower part of that circuit forms the fuel supply of the choke also
     
  14. Joker

    Joker Coming and going... Premium Member Contributing Member

    Messages:
    2,701
    Likes Received:
    1,381
    Trophy Points:
    798
    Joined:
    Feb 2, 2014
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    VFR800, FZR250 3LN Brat, XV1100
    We blew into the ports and all the slides seem to lift the same... when you say it won't lift what do you mean? This is why we were a bit confused as to what it actually does.

    If anyone has a spare (even second hand) couple of these O rings I'd be keen, will pay postage etc. I've used all the ones out of my keyster and litetek kits. I am not keen on the gasket goop alternative but even better if they are not needed.
     
  15. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

    Messages:
    7,681
    Likes Received:
    4,549
    Trophy Points:
    943
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Troublemaker
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Suzuki GSX250 *Triumph Bonneville 750 T140V
    You cant be serious surely .... gasket goop and carbys in the same breath???

    You asked about those o rings and u got advice from 4 very experienced members but u are still waiting for someone to say "nah just leave it out " ..... and worse still we are talking FZR carbs ... the hardest thing on the planet to get right

    :headbang:

    Dont come on here wasting my time (and others) posting bullshit and ignoring the advice given
     
    • Like Like x 1
    • Agree Agree x 1
  16. Joker

    Joker Coming and going... Premium Member Contributing Member

    Messages:
    2,701
    Likes Received:
    1,381
    Trophy Points:
    798
    Joined:
    Feb 2, 2014
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    VFR800, FZR250 3LN Brat, XV1100
    Are you having a bad day?

    I wanted to improve my understanding of what that circuit on the carburetor does - that's what I was asking for. I was not asking for advice on what decision to make and whether or not people approved of it. And I was most definitely not waiting for someone to say "leave it out" as not all advice is good advice. If that statement came with some logical technical reasoning as to why I could (as opposed to a "I've been building bikes in my backyard for 20 years and you should do this") then I would take it into consideration.

    Some people may come on here seeking answers, I come here seeking information. Information helps me to find my own answers.
     
  17. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    2,877
    Likes Received:
    1,672
    Trophy Points:
    798
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's, 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G
    I'll put a good used one in the post for you tomorrow, i still have your postage detail's
     
  18. Joker

    Joker Coming and going... Premium Member Contributing Member

    Messages:
    2,701
    Likes Received:
    1,381
    Trophy Points:
    798
    Joined:
    Feb 2, 2014
    Gender:
    Male
    Location:
    Melbourne
    My Bike:
    VFR800, FZR250 3LN Brat, XV1100
    Thanks mate appreciate it. Do you still want to part with an air box?
     

Share This Page