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MC22 dies at 70 ks in any gear

Discussion in 'Honda 250cc In-line 4's' started by ac_livewire_dc, Jul 1, 2014.

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  1. Hopey626

    Hopey626 Member

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    yep it still does it.

    its still the same.
     
    Last edited by a moderator: Jul 2, 2014
    Hopey626, Jul 2, 2014
    #21
  2. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    how its explained it does sound like fuel starvation to me. does the mc22 have a fuel pump or is it vacuum? something has to be blocked somewhere so i would check all fuel lines and vacuum lines and fuel filters.

    With the tank off i would test that the tap is flowing freely correctly as well. when my bike was dying only on the highway i changed the fuel filter for a high flow one and walla problem solved.
     
    Th3_Huntsman, Jul 2, 2014
    #22
  3. Hopey626

    Hopey626 Member

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    When I took the fuel tank off last night and I turned the fuel tap on it didn't drain so im guessing it's vacuum.
     
    Hopey626, Jul 2, 2014
    #23
  4. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    does it flow set to prime?
     
    Th3_Huntsman, Jul 2, 2014
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  5. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    To unblock the breather i cut about 1 metre of whipper snipper line and run it thru this hole until it comes out the bottom a couple of times or you could use compressed air
    20130206_162046.jpg
     
    Th3_Huntsman, Jul 2, 2014
    #25
  6. Hopey626

    Hopey626 Member

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    I will look into it. cheers
     
    Hopey626, Jul 2, 2014
    #26
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I would also be looking at the internal filter #2 and cleaning the internals of the petcock.

    MC22.jpg
     
    GreyImport, Jul 2, 2014
    #27
  8. Hopey626

    Hopey626 Member

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    its starting to get abit beyond my level now..
     
    Hopey626, Jul 2, 2014
    #28
  9. ac_livewire_dc

    ac_livewire_dc Member

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    You have had the tank off already so getting the petcock out is pretty much half done. you can do this no worries.:thumb_ups:
     
    ac_livewire_dc, Jul 2, 2014
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  10. ac_livewire_dc

    ac_livewire_dc Member

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    to check the flow of the fuel tap try opening the fuel lid so that you can see the rate of flow with out a vacuum interfering.
     
    ac_livewire_dc, Jul 2, 2014
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  11. Hopey626

    Hopey626 Member

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    I Do not know how to do this. I took it for another wurl today and it just dies at any speed over 60km and any gear.
     
    Hopey626, Jul 4, 2014
    #31
  12. kiffsta

    kiffsta Senior Member

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    Hey Hopey,

    can you please pull one of your spark plugs out and post a pic, these are a good tell if its petrol or electrical

    Chris
     
    kiffsta, Jul 4, 2014
    #32
  13. Hopey626

    Hopey626 Member

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    hey Chris. i'll try get on it soon and ill post a pic up
     
    Hopey626, Jul 4, 2014
    #33
  14. Murdo

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

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    If this bike dies at 70Km/h in any gear, the revs and fueling won't be the same. I suggest that you disconnect the speedo and go for a run, may be something in the instrument effecting the cut out. Also check the side stand spring. If this is weak it may be allowing the stand to droop at speed and bringing the engine cut on. Try riding with a rubber band around the stand to hold it up.
     
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    Murdo, Jul 4, 2014
    #34
  15. Hopey626

    Hopey626 Member

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    This is what I think: I went for a ride yesterday and I had to pull over 5 times to let it idle and fix itself. Just before I was at my location it actually just turned off and died on the side of the road. I was sitting their for abit trying to get it start then I pulled the choke out and walla bang it started. it was still really doey but atleast I think I found that its a fuel intake problem. Im thinking that when you pump the speed over 60k's it carnt draw enough fuel to keep up with the speed demand. So either the fuel filter is clogged????? or the air filter is abit clogged????? one or the other I know that the bike isn't getting enough fuel over the speed of 60. it runs awesome at 60 and under so im thinking it's one of these. Where do I look to check the fuel filter and air filter?
     
    Hopey626, Jul 6, 2014
    #35
  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    So did u follow any of Murdos advice?

    And if we look back on the thread u will see that fuel starvation is mentioned and in particular the fuel filter.

    When senior members give advice or suggestions its because they know wat they are talking about.

    Dont change multiple things at once ...... start with the fuel filter ....if it actually has one
    pull the tank up and follow the fuel line that goes towards the carbys from the fuel tap
     
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    GreyImport, Jul 6, 2014
    #36
  17. Hopey626

    Hopey626 Member

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    i will know more tomorrow when I hook into it.
     
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    Hopey626, Jul 6, 2014
    #37
  18. fzr_tim

    fzr_tim Member Premium Member Contributing Member

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    I'll take 2 stabs in the dark here:

    1) Diaphragms in your carburetors might have holes or rips in them

    Or

    2) float bowls aren't filling quick enough to cope with the demands of of load and rpm which brings us back to a Vacuum/ fuel flow problem

    I recommend you pull all your spark plugs out and post photos and label which cylinder they came from

    Further more these bikes are not hard to work on have some faith in yourself and have a go ask questions here and people will help you out if you put in 100% and give it your best shot

    I recently rebuilt/resealed the carburetors on my FZR having never touch a set of carburetors in my life with the help of this forum and a little bit of research it was a piece of piss
     
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    fzr_tim, Jul 13, 2014
    #38
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