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Thread: Start-up needs throttle & maintaining idle or engine cuts out?

  1. #1
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    26th September 2013 - 15:15
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    Start-up needs throttle & maintaining idle or engine cuts out?

    Hi,

    I recently purchased my first motorcycle '2007 Honda CBF250' a month ago.

    I had some issues with start-up always requiring throttle and maintain idle so I took it to a knowledgable friend who helped me give the carb a check (body(?) was clean so did not investigate further).

    All was fine until earlier the bike started to cut out when stopped or the idle came low. Almost like it ran out of fuel. It still has ~50% indicated so it can't be this.

    Any thoughts on what I could do. I am a beginner so happy to spend some money to get it looked at but if there is something small I could check then any help would be great. Any estimates on cost would be appreciated too.

    Thanks

    TL;DR - What is the fix for the start up, idle issues, sudden high rev's?? And, what do you ask for when you want to fix the general running order of a bike so I can commute.

  2. #2
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    29th May 2010 - 21:08
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    Have you replaced the fuel filter, also when it stalls try opening the tank to see if the is a vacuum

  3. #3
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    26th September 2013 - 15:15
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    I haven't replaced or looked into the fuel filter and iI'll have a look into the vacuum. Thanks

    Edit: Update - the nut at the end seems to be all but rounded... bugger... The connected body is just stuff and doesn't want to twist/turn..

    Took it for a ride around the local streets and it stalled in low revs and opened the tank but couldn't only hear dripping. Usually 2 then a pause until the next 2


  4. #4
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    Quote Originally Posted by Jackpot View Post
    I haven't replaced or looked into the fuel filter and iI'll have a look into the vacuum. Thanks

    Edit: Update - the nut at the end seems to be all but rounded... bugger... The connected body is just stuff and doesn't want to twist/turn..

    Took it for a ride around the local streets and it stalled in low revs and opened the tank but couldn't only hear dripping. Usually 2 then a pause until the next 2

    This seems to be in another language.

    Round nuts and dripping?
    I have evolved as a KB member.Now nothing I say should be taken seriously.

  5. #5
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    Quote Originally Posted by mossy1200 View Post
    This seems to be in another language.

    Round nuts and dripping?
    My apologies. I lifted the fuel tank off and could hear dripping inside tank. I am not 100% sure about what to look for in regards to a "vacuum" Sorry

    By "nut" i mean the area (maybe it is bolt(?)) in the diagram attached of the fuel tap. The workshop manual i have says the filter is in the blue area and can be removed seperatly to the body of the fuel tap.

    Cheers. Apologies for the embarrassing use of English...
    Attached Images Attached Images  

  6. #6
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    17th July 2005 - 22:28
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    Have the carb cleaned properly and get your valve clearances set.
    Quote Originally Posted by Paul in NZ View Post
    Ha...Thats true but life is full horrible choices sometimes Merv. Then sometimes just plain stuff happens... and then some more stuff happens.....




    Alloy, stainless and Ti polishing.
    Bling your bike out!
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  7. #7
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    Its most likely blocked jet in carby or the floats are sticking.

    Get someone who knows how to clean and set up the carb or take it to bike shop.

    If your not sure what your doing stop doing stuff to it.
    I have evolved as a KB member.Now nothing I say should be taken seriously.

  8. #8
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    carb clean balance, new gapped plugs. Check if youre firing on all cylinders.

  9. #9
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    Any idea(s) on cost to get carbs cleaned and synced then? Cheers

  10. #10
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    carb clean balance, new gapped plugs. Check if youre firing on all cylinders.

  11. #11
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    Quote Originally Posted by Jackpot View Post
    Any idea(s) on cost to get carbs cleaned and synced then? Cheers
    drain them. Knock them off with a sledge hammer and simmer in a 20lt pot of white vinegar for three days.

  12. #12
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    Quote Originally Posted by Akzle View Post
    drain them. Knock them off with a sledge hammer and simmer in a 20lt pot of white vinegar for three days.
    As much as I would like to give this a go, learn some things along the way and become knowledgeable about maintaining a motorcycle I may veer on the side of going to a shop this time for personal assurance that it is in 99.99% working order for what it should be before I start fiddling. Plus, the aspects of not using older tools of a relation until I get my own may be better in the long run to prevent further damage.

  13. #13
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    Pull your plugs. Give em a wipe, put them back in. May solve the problem

  14. #14
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    Quote Originally Posted by Jackpot View Post
    Any idea(s) on cost to get carbs cleaned and synced then? Cheers
    It'll only have one carb, no need for a sync at all. I'd do it for $100 at my shop, but I'm too cool to work on a CBF TBH
    Quote Originally Posted by Paul in NZ View Post
    Ha...Thats true but life is full horrible choices sometimes Merv. Then sometimes just plain stuff happens... and then some more stuff happens.....




    Alloy, stainless and Ti polishing.
    Bling your bike out!
    PM me

  15. #15
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    If all ealse fails......

    Check that the pilot jet isn't blocked...
    Or the tinny holes in emultion tube are clear..
    If they are blocked there will not be enough primary vacume at low revs to pick the fuel up
    from the float bowl... at low revs the motor has not got enough vacume to suck the fuel up
    from the fuel bowl and needs asisstance....
    Pete

    90% of all Harleys built are still on the road... The other 10% made it back home...
    Ducati... Makeing riders into mechaincs since 1964...

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