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Thread: alot of smoke

  1. #1
    g.willits's Avatar
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    alot of smoke

    i got a 92 650
    with triple fuel pump, and rebuilt carbs with carb kits

    its got a bog on the low end, and the smoke just rolls out of it at idle

    ive tried adjusting the low speeds, but doesnt seem to make a difference

    any ideas?


  2. #2
    bowsniper's Avatar
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    2-strokes smoke a lot/ thats ok.. it will calm down once in the water.. glad to hear the triple pump is in and working ok. check your specs for the low speed adjusters and set them to factory specs.. after running it for a while, stick a led flashlight down the spark plug hole and check your piston wash.. it should have clean spots in 5 places on the top of the piston. if its all black, your real lean and gonna hole a piston.. in that case, turn your lows out a 1/4 turn and try it again after a half tank or so of gas thru it..

    the high spped screw have blue caps on them. they need to come off if your going to adjust them, with the caps on, you can only turn them so far.

    The lows are below the high speed adjusters. they have tees on them..after you adjust them, adjust your idle to 1250-1300 rpms with the tee'd spring loaded adjuster on the carb rail on the end.
    Last edited by bowsniper; 08-11-2010 at 07:15 AM. Reason: I put a . in stead of a / for the low speed turn out, it's 1/4 turn out not 1.4 I changed it.

  3. #3
    g.willits's Avatar
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    yeah i knew what u meant

    it seems to run ok around wot, but still seems to load up and smoke after extended idle

    thanks for the help, ill check the wash and keep playin with it

  4. #4
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    You have the low speed screw too rich. I just went through this on my 94 Sl650. First check your pop off. If its too high that can cause your low end bog. I ended up changing the low speed jets in mine up one size to get rid of the bog. if you try to richen up the low speed screw, you will cause it to idle very rich, and it still wont get rid of the bog. Its posted somewhere around here, but read the Mikuni manual for the SBN carbs. That will give very good instructions on how to get the carb dialed in. Once you get it running good throughout the rpm range, then keep an eye on your piston wash and plugs to make sure you arent too lean.

  5. #5

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    cheak fuel lines, and valum lines''

  6. #6
    g.willits's Avatar
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    piston wash

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  7. #7
    ryandi2's Avatar
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    your last picture looks to lean turn the adjuster out a bit..

    but why is there water on your pistons? it looks like it rained on your pistons.. or did you pistons look like that when you took the heads off?

    make sure you clean that up. and fog the motor very well so it does not rust

  8. #8
    g.willits's Avatar
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    yeah that last piston is the mag, i turned the low and the high out,

    but i got a question?, will running leaning cause the top of the piston and head to look like its been all chewed up/ sand blasted. or is that a crank bearing takin a dump

  9. #9
    ryandi2's Avatar
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    whats your compression? i didnt look at the pictures that close to notice.. but i just did.. it looks like you caught the piston before you lost it completely.. it looks like to me that it was starting to break away from being lean..

    you got a picture of the head handy?

  10. #10
    g.willits's Avatar
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    mag and pto heads

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