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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. ac_livewire_dc

    ac_livewire_dc Member

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    I've sold my cbr 250rr to a fella 2 weeks ago and he's just rang me up telling me the bike is not willing to go any faster than 70k's and when it does get there it start to die/bog down. when i sold the bike it was a ripper and i never had any problems with it. The only thing he tells me he has done different is he's filled it up with high octain fuel, but in the same breath he also said it was doing it before he added the fuel. I only ever used regular unleaded in the bike and i believe the bike was sold with a good amount of fuel still in it

    He's had the bike for just over 2 weeks and now he's decided to call me. I feel for the poor bugger so any help would be greatly appreciated.
     
    ac_livewire_dc, Jul 1, 2014
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  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    In my cynical opinion I would think theres more to it ..... firstly speed is irrelevant ..... he could be 130kg going up a hill in 5th gear
    Its wat RPMs its reaching before it bogs down thats important

    Tell him to drain the fuel and put in 91 or 95 ...wateva u were running beforehand...... and run it stationary to get it into the carby bowls .

    Ask him wat other 'changes' he has made .

    To be honest I would tell him to take a hike ....sold as is and especially if it was running 100% at time of sale.

    The other option would be to tell him to join the forum and present his problem here ..... cuz in my opinion its not your problem.
     
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    GreyImport, Jul 1, 2014
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  3. Murdo

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

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    Agree with Grey.
     
    Murdo, Jul 1, 2014
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  4. kiffsta

    kiffsta Senior Member

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    I agree with GI that its not your problem, as for what its doing, not quite enough information , does it rev freely in neutral ? There is a speed limiter but that doesn't kick in until 180km per hour. The one issues these bikes have is the voltage reg does play up, but there are simple checks he can do with a meter to validate if his stator is okay and then the voltage reg. I agree with Grey, get him to join up and we can walk him through some simple tests and try and nut out what the issue is.

    Chris
     
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    kiffsta, Jul 1, 2014
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  5. ac_livewire_dc

    ac_livewire_dc Member

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    I hear what your both saying that its not really my problem however i don't want my cbr to leave a bad taste in his mouth. I will try to get him to sign up and explain exactly what happening .
    i did think the fuel was the initial problem but when he told me it started happening on the fuel sold with the bike...well that shot that idea down. Then i thought it might be a spark problem but the bike is now 300km away and i'm not the best auto elec. He is quite adamant it is related to speed (70k) and that just makes my brain fart and freeze up. Thank you both sooo much for the quick replies.
     
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    ac_livewire_dc, Jul 1, 2014
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  6. kiffsta

    kiffsta Senior Member

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    Where is the bike located ?


    Sent from my iPhone using Tapatalk
     
    kiffsta, Jul 1, 2014
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  7. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Mate as said wouldn't stress sold as is and I agree there is most probably something not said if he wants help join up and I'm sure between us all we can help?
    I sold I 4wd once and 2 days later got a call about a oil leak that appeared! I told him gearbox just rebuilt and has warranty take to the mechanic after talking to my guy later found out he smashed sump out bush being silly and forgot to mention lol like I said sometimes they forget to mention some things
     
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    Mclaren, Jul 1, 2014
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  8. ac_livewire_dc

    ac_livewire_dc Member

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    the bike is down in wadonga. im in canberra.
     
    ac_livewire_dc, Jul 1, 2014
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  9. kiffsta

    kiffsta Senior Member

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    bugger to far away from me :)
     
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    kiffsta, Jul 1, 2014
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  10. ac_livewire_dc

    ac_livewire_dc Member

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    should i mention that its the Australian delivered model?
     
    ac_livewire_dc, Jul 1, 2014
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  11. kiffsta

    kiffsta Senior Member

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    The Aussie delivered Cibby had a few changes from the earlier, but nothing too significant. If I was troubleshooting this, this I what I would do.

    1. Put a multimeter across the positive and negative terminals of the battery while the bike is off, see what voltage the battery has , should be about 12.5v **
    2. Put a multimeter across the positive and negative terminals while its running and rev it to 5000 rpm, and check the voltage, should be between 13 and 14.5 volts.
    3. Pop the rear fairings off, put meter on the voltage reg and test it
    4. Using a meter, check the voltage coming from the stator, test all 3 phases
    5. While cold, start the bike and check the heat on the headers to ensure all 4 cylinders are firing ( use a rag so you don't burn your hand), or use a water spray bottle and spray each pipe to validate if its firing on all 4.
    6. Pop the tank and air box off and test the coils with a meter, test for impendence.
    7. Pull the plugs out, check the colour, make sure the right plugs are in there
    8. test each coil for spark by grounding a spare plug against the head (don't hold the lead)
    9. Pull the front fairing off and check the wiring harness that goes to the speedo, the Cibby has a speed restrictor built into it. If you reach 180 klm/h it drops the spark on a few cylinders so if that's not connected properly then it will make it run on 3.
    10. Check the wiring to the side stand, if the switch is dodgy it might be dropping the circuit which will cut power to the coils.

    If all that tests okay, the start on the Carbies, strip clean, check all the jets, check if there is a fuel filter for blockages, then also check the petcock and the strainer, there could be some crap in the there that impeding the flow of fuel. Check the air cleaner... if that doesn't find the problem, then i'd be getting a compression gauge and testing the engine.

    If all that fails, take it to a mechanic

    ** THESE BIKES NEED A REALLY GOOD BATTERY

    The manual is available on the Net or here for a modest donation, good luck in finding the fault.
     
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    kiffsta, Jul 1, 2014
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  12. Hopey626

    Hopey626 Member

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    Ok so its my bike. I got my L's about 4 days ago. Took it out for its 1st ride the other day and found that when I sit on a speed of 70 and above the bike just bogs down and im forced to stop and let it idle for 5 to 10 minutes before its back to normal. When I got the bike it had just about a full tank so I didn't have to fill it up until 2 or so days ago. I did put 98 octane fuel in it and the problem still exists. Last Night I drained all fuel and ran the bike with the fuel tank off to burn all fuel in the carbie. I then put it all together and filled with normal (not ethanol) 91 fuel. I set off into town today and could feel that it was a lot smoother. where I live its only 60 zones all the way to town. I took it uop to 100 and it bogged down again. I had to pull over and etc etc its then same thing all over again.
     
    Hopey626, Jul 2, 2014
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  13. Murdo

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

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    Sound like a blocked fuel supply. Have you cleaned the tank strainer, fuel filter, etc?
     
    Murdo, Jul 2, 2014
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  14. ac_livewire_dc

    ac_livewire_dc Member

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    would it still rev freely in neutral if the fuel supply was having issues?
     
    ac_livewire_dc, Jul 2, 2014
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  15. Hopey626

    Hopey626 Member

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    Just went into the shed before. it revs fine all the way in neutral

    It rides perfect all around town.
     
    Hopey626, Jul 2, 2014
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  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yes ...... when its under load in a high gear pulling your weight its a different story

    My FZR has reved like stink sitting stationary but when ridden out on the street its died in the ass

    Its struggling when the fuel supply is needed at its max ...... as mentioned .....fuel filter , internal tank filters ....also the tank breather may be blocked ..... try it at high revs and high speed with the tank lid slightly open ...(not with a FULL tank of fuel though)
     
    GreyImport, Jul 2, 2014
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  17. Hopey626

    Hopey626 Member

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    You mean Go for a ride at say 80 with the lid slightly open?
     
    Hopey626, Jul 2, 2014
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  18. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    yes ..... but not with the tank full to the brim so it doesnt slosh out ..... just see if it will get past your 'bog down" point .

    If your fuel tank is creating a vacuum then its going to restrict the flow.
     
    GreyImport, Jul 2, 2014
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  19. Hopey626

    Hopey626 Member

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    ok. I will be back in a sec
     
    Hopey626, Jul 2, 2014
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  20. ac_livewire_dc

    ac_livewire_dc Member

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    ac_livewire_dc, Jul 2, 2014
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