/ Register

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

Help Bandit 250 problem.

Discussion in 'Suzuki 250cc In-line 4's' started by Alibongobingo, Mar 18, 2018.

Page 4 of 4
  1. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

    Messages:
    3,999
    Likes Received:
    2,216
    Trophy Points:
    923
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Occupation:
    Gardener
    Location:
    Tasmania
    Home Page:
    My Bike:
    Spada, VT250F & ZX2R
    Does the mixture screw affect the engine at WOT?
     
    Frankster, Apr 1, 2018
    #61
  2. Murdo

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

    Messages:
    6,399
    Likes Received:
    4,786
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    No.
     
    • Agree Agree x 1
    Murdo, Apr 1, 2018
    #62
  3. Alibongobingo

    Alibongobingo Member

    Messages:
    25
    Likes Received:
    10
    Trophy Points:
    13
    Joined:
    Mar 18, 2018
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    Bandit 250. Kwaka zzr600
    I had wondered, being a 'pilot' jet adjustment, what it would do at WOT.
     
    Alibongobingo, Apr 1, 2018
    #63
  4. Alibongobingo

    Alibongobingo Member

    Messages:
    25
    Likes Received:
    10
    Trophy Points:
    13
    Joined:
    Mar 18, 2018
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    Bandit 250. Kwaka zzr600
    So. The erratic idle is fixed. I had clip on the carb rubber come loose. I've replaced them all with new hose clips and have a good seal now. Idle is steady.

    I've set the pilots to 1.25 turns out each and it seems to like it. It's smooth up through the revs and at WOT. (Probably because i fixed any air leaks)
    Still. I'd like it if it just felt a bit more pokey. A go on a known 'good' example might set any fears to rest but on looking at the figures for the model, I feel some ponies have fled the stable. Perhaps not.. When the bike is registered and tested and road legal I'll run some timings and perhaps we can decide.

    My gpx250 definitely felt livelier in the mid range though and that was only a twin. Very light though and admittedly i was somewhat lighter and a novice rider back then. Anything feels quick to a novice. Heck, my ZZR600 daily donkey feels slow to me some days and that's a 100bhp bike.
     
    • Like Like x 1
    Alibongobingo, Apr 1, 2018
    #64
  5. Wozza

    Wozza Active Member

    Messages:
    361
    Likes Received:
    191
    Trophy Points:
    148
    Joined:
    Mar 21, 2017
    Gender:
    Male
    Location:
    South Australia
    My Bike:
    GB250
    Are the front and rear sprocket teeth count stock? if so maybe drop the front a tooth or raise the rear by 2
     
    Wozza, Apr 1, 2018
    #65
  6. Alibongobingo

    Alibongobingo Member

    Messages:
    25
    Likes Received:
    10
    Trophy Points:
    13
    Joined:
    Mar 18, 2018
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    Bandit 250. Kwaka zzr600
    Its all totally stock.
    This bike actually belongs to my house mate. She's decided not to take up bike riding and just wants it sold. To that end I'm trying to get it running as best as it can stock to sell.
    I would buy it off her myself and keep it as I am quiet fond of it, especially the smile factor chuckability, but I have to concede that it's just physically too small for 188cm, 100kg me.
     
    Alibongobingo, Apr 1, 2018
    #66
  7. Alibongobingo

    Alibongobingo Member

    Messages:
    25
    Likes Received:
    10
    Trophy Points:
    13
    Joined:
    Mar 18, 2018
    Gender:
    Male
    Location:
    Brisbane
    My Bike:
    Bandit 250. Kwaka zzr600
    Chug mode has returned. :/

    Float height seems to only stop it from doing it as often, if i go too low it starves it of fuel altogether.
    To recap. On acceleration it will suddenly die and drop to 2000rpm WOT. Letting the throttle off will stall it. It stays like this until the fuel is shut off and then after 30 secs or so it comes good.

    I am still at a loss. The carbies are totally cleaned thoroughly. Needles and tubes all show no wear. I cannot fathom how this is possible. The float valves are not leaking etc...etc....etc ...!

    Also the R/R has probably **** itself now as the light dims on revving and all the connections/earth etc are good.

    I'm ready to throw the bike in the bin.

    :(
     
    Alibongobingo, Apr 19, 2018
    #67
  8. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,230
    Likes Received:
    1,416
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Beware of the assumption of the needles and tubes all show no wear at all - that misreading when I first encountered the same problem - the clearances are minuscule.

    My needles didn't display any wear at all and it was impossible to discern emulsion tube wear
     
    • Agree Agree x 1
    ruckusman, Apr 19, 2018
    #68
  9. 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
    It is cases like this that are my incentive to do complete seal kits for carbs including throttle shaft seals. I have zero patience for chasing my tail. Rebuild the carbs once and once only. If you do part of the job you might get lucky and if you don't then you will never fix the bike because you think you have already done the carbs. Not aiming this at you specifically @Alibongobingo you are stuck between a rock and a hard place because it is not your bike and you are not free to spend the money you need to get it done. A 250cc four is a high strung complex machine and they are so old now that it is only those who love them that are willing to give them the attention they need. The learning to ride group are much better off buying a newer commuter model.
     
    • Like Like x 1
    Last edited: Apr 20, 2018
    maelstrom, Apr 19, 2018
    #69
  10. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    4,313
    Likes Received:
    2,383
    Trophy Points:
    898
    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, 1976 IT400C 510
    Sound's like it's flooding or the float height/fuel level is still to high, then when you turn the fuel off it come's good (when the float height / fuel level drop's)
     
    • Agree Agree x 1
    my67xr, Apr 19, 2018
    #70
  11. Cbuzz

    Cbuzz Well-Known Member Dirty Wheel Club

    Messages:
    142
    Likes Received:
    58
    Trophy Points:
    233
    Joined:
    Mar 30, 2017
    Gender:
    Male
    Location:
    Australia
    My Bike:
    ZXR250A
    I got a very similar thing happening to my 250 bandit @ WOT. Revs to 5-6k bogs out then drops & most of the time stalls.

    Had my float heights at 12mm, 13mm & 14mm made very little difference. Brand new needles & had a full kit put through it. I've pulled the carbs at least 10/12 (lost track) times & about to run the bike into the wall. Doing my head in.
     
    Cbuzz, Apr 22, 2018
    #71
  12. Cbuzz

    Cbuzz Well-Known Member Dirty Wheel Club

    Messages:
    142
    Likes Received:
    58
    Trophy Points:
    233
    Joined:
    Mar 30, 2017
    Gender:
    Male
    Location:
    Australia
    My Bike:
    ZXR250A
    Fixed!!!!!

    All up prob pulled the carbs at least 12 times.

    Pretty sure it was a combination of a few things.

    Wrong size jets. Pulled them all including the emulsion tubes & soaked then overnight.

    Underneath the float valve needle on two of the carbs there is a little filter attached to a copper tube. There was very small stick like things actually underneath the filter blocking the flow of fuel. How the hell did they get there only god knows.

    Anyway here are my current settings that have the bike purring like a kitten. ZERO hesitation all the way to redline 18k.

    Float height 12mm exactly all 4 floats
    1.75 turns out on air fuel mix all 4
    Bench syncd eyeballed it & feels almost perfect. No hanging at all.

    Pretty stoked at the moment.
     
    • Winner Winner x 3
    • Nice Work Nice Work x 2
    Cbuzz, Apr 24, 2018
    #72
  13. 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
    Good work! That is one Bandit fixed. I think Mr Grey has a maxim that states something about carbs and 4 bangers.
     
    • Agree Agree x 1
    maelstrom, Apr 24, 2018
    #73
  14. 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
    I think its the first Bandit here ever to run 100% :D
     
    GreyImport, Apr 24, 2018
    #74
  15. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

    Messages:
    4,291
    Likes Received:
    2,506
    Trophy Points:
    918
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Albury 2641
    My Bike:
    1987 Yamaha SRX250, Honda 1974 SL125 K1, 2022 Triumph Tiger Sport 660
    For now :prankster:
     
    • Agree Agree x 1
    Andych, Apr 24, 2018
    #75
  16. Jonno

    Jonno Active Member

    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    165
    Joined:
    Jan 28, 2015
    Gender:
    Male
    Location:
    Australia
    My Bike:
    Suzuki Bandit GSF250
    I had the same thing with my Bandit. pulled carbs off, cleaned, adjusted, balanced.
    Ended up being the fuel tap!
     
    Jonno, Apr 26, 2018
    #76
  17. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

    Messages:
    4,734
    Likes Received:
    2,874
    Trophy Points:
    943
    Joined:
    Mar 18, 2014
    Location:
    Sydney NSW
    My Bike:
    FZR250R 3LN6
    'For now' is the best you can get... tis the nature of the Mikuni BDST carb
     
    Linkin, Apr 26, 2018
    #77
  18. Cbuzz

    Cbuzz Well-Known Member Dirty Wheel Club

    Messages:
    142
    Likes Received:
    58
    Trophy Points:
    233
    Joined:
    Mar 30, 2017
    Gender:
    Male
    Location:
    Australia
    My Bike:
    ZXR250A
    Hahahaa, well it took me a month or probably more. Like having a second full time job.

    Put some new plugs in today with exactly .7mm gap & took her for a 4hr ride. Pulled one to check the color & it was in the Perfect color air/fuel mix zone.

    Boy what a pleasure these bikes are to ride when they actually run really well.

    I strongly suggest changing the needles as well very important. I eyeballed the needles on the motorcyclespareswarehouse at identified these as the correct needles.

    https://www.motorcyclespareswarehouse.com.au/collections/keyster-aa-needle/products/kvn-16q2t

    These guy's have just added "GSF250 Bandit 1990" to the list because I told them to.

    I made up a makeshift seat leak checker for the carbs as well. I should probably start a thread with all this info that may help someone in the future.
     
    • Like Like x 2
    • Nice Work Nice Work x 2
    Cbuzz, May 4, 2018
    #78
  19. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    4,313
    Likes Received:
    2,383
    Trophy Points:
    898
    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, 1976 IT400C 510
    Some of the Keyster needle's (needle and seat's) have a heavier rate spring in them i found, much harder than the original's

     
    • Informative Informative x 1
    my67xr, May 4, 2018
    #79
Page 4 of 4

Share This Page