98 1100xx running rich.... sometimes
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Thread: 98 1100xx running rich.... sometimes

  1. #1

    Member #
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    98 CBR 1100xx, 91 CBR 600F2, 91 VFR750F, 85 Wing
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    98 1100xx running rich.... sometimes

    I just bought me one of these beauties and brought it out of long term storage. it was definitely properly stored as far as I can tell. but on cold start up it will do this weird hiss thump noise from under the gas tank a couple of times and then go away. it also did something weird the other night when I decided to take it to redline for the first time since waking it up the speedometer cut out completely and it started to run really rich. back firing and wouldn't idle I did manage to get it home. so when I woke up this morning and started it up it did the hiss thump thing again but it has since ran perfectly... anyone have any Ideas. Thank you in advance!!!

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  3. #2

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    Re: 98 1100xx running rich.... sometimes

    Could you get a recording of it and we can diagnose it from there. There are lines coming off the carbs that feed a vacuum diaphragm that control the petcock. you may have a ruptured diaphragm there. Check your oil level if that is leaking it will dump raw fuel into the crankcase. If it's reading high or smells of fuel DO NOT RUN the bike untill you change the oil and the filter and find the fuel leak. Check plug colors as well make sure they are all chocolate brown.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  4. #3

    Member #
    37161
    Bike(s)
    98 CBR 1100xx, 91 CBR 600F2, 91 VFR750F, 85 Wing
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    Re: 98 1100xx running rich.... sometimes

    eww... Ok I will definitely check that. Dangit I did run it a little bit to get it home. I'll definitely check this stuff out and get back to you. Thanks!!!

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  6. #4

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    Re: 98 1100xx running rich.... sometimes

    Before you ask, "Where do all those hoses go to?" Check the link:

    https://www.cbrxx.com/engine-airbox-...tml#post368230


    T.
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    "Stemmata quid faciunt."

  7. #5

    Member #
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    98 CBR 1100xx, 91 CBR 600F2, 91 VFR750F, 85 Wing
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    Well I most definitely have a fuel leak because there was a ton o gas in the crank case. Where should I go from here?

  8. #6

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    Re: 98 1100xx running rich.... sometimes

    Let me see if I can direct you correctly.

    You will need to lift the fuel tank. So remove seat. Undue the hold down bolt at the rear of the tank. Remove or provide access (unhook) the gray tank surround in fill panels...then you can tilt the tank up. You can support the tank at the rear with a block of wood of some sort..or use the tool kits wrench and slider handle as a prop to hold the tank up. Do not remove the tank if you were thinking of doing so. At least not yet. O.k. that's phase one.

    Phase two: Click on my link above and find the petcock and the vacuum supply line I have identifiec on the front face of the petcock. follow that vacuum supply line down to the nipple which should be below/between the #2 cylinder area on the cylinder head. Again..see my link and pictures which identifies the nipple. If you pull the small hose off that nipple at the cylinder head it is possible (hopeful) that fuel will run out of it or at least be present in it to some degree. If this is the case, fuel is present, it will mean that the diaphragm in the petcock is perhaps holed out and fuel in pasing directly to the crank case via that vacuum supply hose. There is a repair kit available for the petcock. Part # follows:

    COVER SET, PETCOCK

    16953-ML0-014

    Partzilla list them for approx. $33.00 https://www.partzilla.com/product/ho...fd76628a1d7fb6 your cost will vari with your local dealer.

    HTH.

    T.
    "Stemmata quid faciunt."

  9. #7

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    Re: 98 1100xx running rich.... sometimes

    After you have the leak fixed pull the plugs and drain the oil and change the filter. Refill with regular oil and roll the motor over, plugs out to blow out the cylinders. Put the plugs back in fire the bike up let it warm a bit and then change the oil and filter again. You should be good from there. You could find an oil pressure gauge and tee off the oil pressure switch and check running pressure for a piece of mind. Here is the factory spec, if you in that area you can have some assurance you didn't hurt anything

    490 kPa (5.0 kgf/cm 2 or 71 psi) at
    5,400 rpm / (176 °F/80 °C)
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  10. #8

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    Re: 98 1100xx running rich.... sometimes

    In addition to the good advise by Tigrest and Beestoys it might be agood idea to check the cut off valves in the carb float chambers in case they are sticking or leaking.
    As you say it was stored so the gas may have turned to varnish and jammed one or more of the valves.
    A bit of a PITA job but I think you need to dive in and do it!
    Good luck!

  11. #9

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    I think I found the problem, my question is how was the bike running without the vacuum line connected? Thank you all again for the amazing advice. I'm definitely sticking around here and maybe someday will be able to hand down some of my own knowledge. Talking to my dealership about it and they don't think I was running it long enough to do any major damage...
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  12. #10

    Member #
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    More pics to come as I continue to work on it

  13. #11

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    Re: 98 1100xx running rich.... sometimes

    Quote Originally Posted by Jorgy23 View Post
    I think I found the problem, my question is how was the bike running without the vacuum line connected? Thank you all again for the amazing advice. I'm definitely sticking around here and maybe someday will be able to hand down some of my own knowledge. Talking to my dealership about it and they don't think I was running it long enough to do any major damage...
    Sounds like your petcock is FUBAR then if there was no vacuum to it because without the vacuum it shouldn't be opening to allow fuel through
    Maybe it had a pinhole which was enough initially to allow it to run but with the full throttle run it split wide open and dumped fuel in
    If you disconnect the fuel line to the carbs in that pic does fuel piss out the petcock? The fuel is probably just running straight through the petcock and into the carbs flooding the bike
    98 TITANIUM Blackbird
    OzBB.net Administrator

  14. #12

    Member #
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    Very wet carbs the sliders were even wet

  15. #13

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    Under neath the air cleaner
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  16. #14

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    Top of the airbox
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  17. #15

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    I just turned the petcock on and after about a minute the left side fuel line started leaking...


 
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