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Still trying to get the bandit going...

Discussion in 'Suzuki 250cc In-line 4's' started by Joker, Mar 14, 2014.

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  1. Ed Kim

    Ed Kim Member

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    Yep, running slightly rich (and starts without choke pretty quickly) but running :D

    I actually did use that litetek guide and from the pictures, I knew that my screws were in the wrong position. Cheers for that resource - it's probably the best Mikuni resource I've seen on the web for small Jap bikes
     
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    Ed Kim, May 23, 2015
    #101
  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Find @Grasshopper guide to setting mixture screws by ear and @Linkin story about worn needles and emulsion tubes. Very useful.
     
    maelstrom, May 23, 2015
    #102
  3. Ed Kim

    Ed Kim Member

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    There isn't any service data on the 45 HP model carb from here:
    http://www1.synapse.ne.jp/s-hara/bandit/ban-sdatae.html

    I think the float height, that is - the point when the fuel cuts off (before the extra buffer pin is engaged) should be about 12mm

    My reference is this guy on perth street bikes:
    https://www.perthstreetbikes.com/forum/showthread.php?t=144538&page=2

     
    Ed Kim, May 24, 2015
    #103
  4. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    サービスマニュアルスズキバンディットgsf250
    Search for genuine service manual.

    It is a two step process, yes?
    1/ Find correct specification
    2/ Apply

    So what happened to step 1?
    Well if you can't buy it on eBay it can't be done so "Oh my mate's sister was talking to her cousin who knew someone who thought this, so I thought I would post it up to help you out". Pretty soon links appear all over the internet and folklore becomes reality as it moves into position one on a google search. Then comes an endless stream of complaining owners who are advised to raise/lower needles, change jets and god knows what else. The finale is the "I've had it with this piece of garbage. I'm gonna sell it". The new owner then starts the cycle all over again.

    Sorry, but I do not think it is prudent to believe any posted specifications without at least a reference to the document that they came from, particularly for grey bikes. It is very unlikely that the float height would be different between different versions (restricted or not) of the same bike. If someone wants to post a translated version of a Japanese document then it would be appropriate to also post the original Japanese text. To err is human after all.
    This problem is so bad for the BDST range of Mikunis that a lot of the members here, including myself, had to do a lot of background work to get the correct information and it is still a work in progress.
    http://litetek.co/Guide_Mikuni_BDST_Fuel_Level.html

    cheers
    Blair
     
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    maelstrom, May 24, 2015
    #104
  5. Ed Kim

    Ed Kim Member

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    Cheers Blair,

    I appreciate your input and you're right in a sense but I could not find the correct specs for what the float level should be and that was a measurement actually done by a GSF250 owner and it seemed to work for him.

    I did look at your litetek page but there's nothing for the Suzuki section

    On a positive note, I got rid of my grey smoke by setting the float to 12mm and she's pretty much back to the way she was before. I'll go for a few more rides and tinker around with the mixture screws, otherwise take her into a shop for proper tuning.
    I also found that spraying carb cleaner on the float seal helped me to seat it flush with the carb surface.

    I had it set to the 40hp model float height before (~8.5mm) but there was too much fuel in the mixture. I incremented it again to 10mm and still it was too much.

    The pic below is the position I measured the float heights in (which was also tough to find!). It's the cut of point when fuel stops flowing into the bowl and before the little buffer pin is compressed.

    [​IMG]

    Also, I didn't have calipers to measure it with and used a premeasured barcode cutout instead.
    Good enough for +/- 1mm ;)
     
    Ed Kim, May 24, 2015
    #105
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Goodo. Any progress is good progress.
    I did not mean to imply that the information for the Bandit was on my webpage. Just an example of the difficulty of finding the correct information. If you plan to keep the bike then I suggest buying a genuine service manual.
     
    maelstrom, May 24, 2015
    #106
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