The Official "MY BIKE WONT START" Thread!
Close
Login to Your Account
CBR250 Forums - Powered by vBulletin
Page 1 of 5 123 ... LastLast
Results 1 to 10 of 41

Thread: The Official "MY BIKE WONT START" Thread!

  1. #1
    Senior Biker The Dwarf's Avatar
    Member #
    6
    Join Date
    Apr 2004
    Location
    IRELAND
    Posts
    2,156

    The Official "MY BIKE WONT START" Thread!

    The most common thread posted on the old forum was "my bike wont start!"
    Maybe this could be stickied so that people can do the simple checks first.

    Do not respond to this thread with anything other than facts.
    I know this thread is awesome so pm me rather than post here.
    Do not post your starting problem here, try the suggestions then make a new thread with as much clear info as possible.


    I am not a mechanic but i have some knoweledge of bikes.
    This thread is for facts only, anything I have missed please add.
    Anyting I have gotten wrong let me know and I will edit it.


    The simple stuff.
    [size=large]KILL SWITCH![/size]
    Its a big red button on the right hand handlebar, make sure its on.

    Is your fuel tap off? on? reserve? Try it on reserve if you are low on petrol.

    Is the petrol old? if it is drain out the tank and refill with fresh petrol.

    Sidestand switch? is your bike in nuetral, if it is in gear it will not start with the side stand down.

    FUSES! Check all fuses!

    ARE YOUR BATTERY CONNECTIONS TIGHT?

    Can you push start it? Put bike in 1st gear with ignition on and run with it(or even better if you get a mate to push you) jump on and release clutch.
    Give a little bit of throttle and make sure your on a clear road.

    Check all earth connections on frame/engine etc.

    If none of the above apply read on.


    The basics for an engine to to go are fuel, spark and air.
    One is always missing completley, lacking or getting/giving too much.
    If you can determine which one is the problem then that makes things easier, if you cant it is a process of illimination.

    SPARK

    Is your spark weak?
    If your bike is turning over but not starting your spark plugs may be not getting enough power or could be in need of replacement.
    Buy a multi metre, they are cheap and will last a lifetime.
    Your battery should be putting out about 12.5 volts when the bike is not on.
    Charge it for a while and try and start it again if its lower than this.
    If your battery keeps dying replace it, if you get the bike running and your battery keeps dying change the regulator rectifier.
    Check this golden nuget from eclipze if you think if you think you are having batt/reg rec problems... http://cbr250.com/forum/thread-282.html

    To check if you are getting a spark take out a plug attached to the plug cap and touch the metal off the frame.
    Hit the starter and check if you can see a blue spark.
    WARNING!!! only hold the rubber plug cap and not the metal as you will fry yourself.

    If you have the plugs out you may aswell replace them!
    If your a cheap ass you may rub them down with sand paper or a wire brush. (or if you know they are relitivley new.)

    TIP
    If your bike is running on less than all four cylinders throw water on the header pipes and see which one doesnt steam off.

    If you have replaced the spark plugs and you are still not getting spark replace the HT leads and or plug caps.

    If that does not work Check the coils, replace the coils or get a friends coils to test and rule them in or out.

    FUEL!

    Are you getting fuel?
    Is your fuel tap blocked? take off the fuel line from the tank and turn fuel on, if its not dripping out your tap is cloged up.

    Are your fuel lines connected properly?

    Is your fuel pump working? check with a mulitmeter if its getting power.

    Clean your carbs! Clean your carbs! Clean your carbs!
    CBRs carbs can get clogged up for many reasons restricting fuel.
    Take the carbs apart one by one and use carb cleaner found in any auto shop.
    You tube has some good carb cleaning vids.
    Check there is no holes or tears in the diaframs (Black rubber nipple things), this can hinder running.
    Make sure you clean the jets and put everything back exactly as you found it.
    Count the amout of turns in on all idle screws etc.
    Inspect the float heights.
    Only use petrol resistant silicone to seal back up the carbs, I recomend a product called "indian gasket" go easy with it and its messy!

    Thanks to K916 for this "how to clean your carbs write up" http://cbr250.com/forum/thread-231.html

    HAVE YOU FLOODED IT?
    If you suspect you have flooded your bike, leave it for an hour and try again with no throttle!
    If that doesnt work drain the carbs and try again.
    If its still not working you may have hydrolocked your pistons, take a plug out and hit the starter for a second.
    Put the plug back in and try again.

    LASTLY make sure your carbs are on perfectly and tight!

    If all that fails burn your bike thats a joke.

    AIR

    Is your air filter durty as hell? change if for a new one.
    Make sure your airbox is on perfectly and tight.


    MY BIKE DOES NOTHING WHEN I HIT THE STARTER, ZIP, NADDA, NOT A SOUND!
    Check fuses.
    Check battery connections.
    Check relays.
    Check for corrosion on the starter motor wires/connections.
    Check starter button in switch gear for corrosion/connections.
    Killswitch.
    Sidestand.

    Oh and Info from Studricho,
    The main rule to starting a cbr (or any bike for that matter) is don't turn on the ignition until your ready to start the bike.

    I've seen so many people turn the ignition on, then fiddle with gloves, then jacket, sit on bike, then forgot to put back pack on, then can't do up helmet with gloves on and then perform a 47 point safety check and decide to hit the starter button with kill switch on for at least 10 attempts.

    Result

    Battery has dropped in voltage and not enough to crank the engine quick enough, spark plugs fouled and no start.



    This is the simple stuff covered.
    Hope this helps a few people.
    Good luck.

  2. #2
    Administrator Jay's Avatar
    Member #
    3
    Join Date
    Jun 2001
    Location
    Eire
    Posts
    4,213

    RE: The Official "MY BIKE WONT START" Thread!

    Done...I think.



  3. #3
    Junior Biker grayman's Avatar
    Member #
    21
    Join Date
    Aug 2008
    Location
    Hicksville
    Posts
    126

    RE: The Official "MY BIKE WONT START" Thread!

    To help with troubleshooting, get yourself a copy of the manual and parts fiche.
    [size=small]Burning passion, heat my day. Let me sit astride your wonder. Cloudless daydreams, oh dance of dances, to have tamed the sound of Thunder![/size]

  4. Remove Advertisements
    CBR250.com
    Advertisements
     

  5. #4
    Super Moderator
    Member #
    4
    Join Date
    Mar 2002
    Location
    India
    Posts
    27,307

    RE: The Official "MY BIKE WONT START" Thread!

    Nice one Wee-Man

    ooops, am i not allowed to say it in this thread? ;-)

  6. #5
    Junior Biker
    Member #
    527
    Join Date
    Jun 2010
    Posts
    53

    RE: The Official "MY BIKE WONT START" Thread!

    Good stuff mate. Only thing I'd recommend you change is the part on push starting - I'd use second gear. First is usually too low.

    Cheers - boingk

  7. #6
    Biker
    Member #
    205
    Join Date
    Jun 2009
    Location
    Melbourne
    Posts
    245

    RE: The Official "MY BIKE WONT START" Thread!

    Another thing you might want to add is to check the compression, and if it is low in one or more cylinders (like it was in mine) check valve clearances BEFORE pulling the head off. i thought it was my rings that were gone but evidently my valves have just become tight and need the shims replaced resulting in low compression and backfiring through the carby because the inlet valve wasn't closing.
    Also maybe add some deets about standard compression values you should get (mine was round 140psi for the good cylinders if i remember correctly, but don't know if thats the standard)
    maybe also stick up the points to spark plug order for those rebuilding their bikes?

    Regards,
    Tyrone

  8. #7
    Biker
    Member #
    166
    Join Date
    Apr 2009
    Location
    Gold Coast
    Posts
    1,629

    RE: The Official "MY BIKE WONT START" Thread!

    figured this is a good thread to ask this in...
    went to start the bike (mc22) this morning and it didn't fire straight away, so i pulled the choke on, had another crack...sometimes it would start, others it wouldn't...even when it did start it would idle low and then cut out.
    got the bike started and running with no choke just before, but it didn't rev well (as in it was bogging down big time, but would eventually come good and rev like it should...while low in the revs it didn't sound normal either, very low and 'grumbly').
    what would be the most likely cause of this?
    there is no battery issues as the battery is new and checked the charge level on it just now and all is good.
    i was going to check the plugs but i'm going out so don't have the time right now.
    i'm also assuming maybe a carby clean and balance is needed??

    edit: when i had the bike running it stalled out by itself after about a minute.
    there is fuel in the tank and it is fresh.
    almost seems like its overfuelling itself??

  9. #8
    Senior Biker The Dwarf's Avatar
    Member #
    6
    Join Date
    Apr 2004
    Location
    IRELAND
    Posts
    2,156

    RE: The Official "MY BIKE WONT START" Thread!

    Quote Originally Posted by mat_p
    figured this is a good thread to ask this in...
    Ah for fuck sake! So the big red writing doesn't apply to you?
    Make your own thread like the instructions say!

    On regaurds to your problem, fuel starvation I suspect.
    Try raising the idle revs, and let your bike warm up before you try to rev it.
    If you reply to this thread You will get negative reps! From everyone!

    K916, please lock this up again to save us from colourblind Aussies!


  10. #9
    Junior Biker
    Member #
    1085
    Join Date
    Sep 2010
    Posts
    38

    RE: The Official "MY BIKE WONT START" Thread!

    Two things I have found:

    Bike difficult to start can also be because of not riding it enough, or only doing short rides: result fouled plugs, battery in poor condition. Then, even though the engine can still turn over (sometimes giving the false impression that the battery is ok), the spark can be weak because the CBR250 ECU needs a decent voltage to get a good spark. (The voltage drops while the starter is cranking over) Starting is made worse if the plugs are fouled. I find if I leave the bike idling for too long just before turning it off, it will be a little difficult to start next time. Same for leaving it sitting for more than a week. But ride it properly (i.e. decent revs as well as not just doing short 5min trips) the battery and the plugs will be in good shape for starting next time. (The CBR250 batteries are only small, so you really need to look after them)

    Of course there are more elements to why this practice may seem to work, but basically, it works! (my own bike was not ridden for 2 months. Would not start at all. Cranked for ages but would not start (well almost started, but that was clutch starting it.). But charge battery, once going, take for a decent ride and next time it started first go! (My fuel was still ok btw)

    Probably obvious to most of you, but just in case... turn your headlights off before you attempt to start, it will start easier!

    The Dwarf: Thanks for starting the thread!

    Cheers all.

  11. #10
    Banned
    Member #
    2538
    Join Date
    Dec 2010
    Location
    Usa
    Posts
    4

    RE: The Official "MY BIKE WONT START" Thread!

    Great post made by you and sorry for posting here because i only want to tell you that i have read the instructions carefully and i will take care of it in the future..

Page 1 of 5 123 ... LastLast

Similar Threads

  1. Bike wont start!
    By hunkipunky in forum General Technical
    Replies: 12
    Last Post: 16th July 2011, 01:39 PM
  2. bike wont start :(
    By monstercbr in forum CBR250 Forum
    Replies: 7
    Last Post: 25th June 2011, 08:12 AM
  3. [split] The Official "MY BIKE WONT START" Thread!
    By xcwizit in forum CBR250 Forum
    Replies: 10
    Last Post: 29th July 2010, 07:03 AM
  4. [split] The Official "MY BIKE WONT START" Thread!
    By Chewske in forum CBR250 Forum
    Replies: 10
    Last Post: 27th June 2010, 08:10 PM
  5. [split] The Official "MY BIKE WONT START" Thread!
    By phicise in forum CBR250 Forum
    Replies: 2
    Last Post: 25th June 2010, 04:45 PM

Search tags for this page

bike wont start

,
cbr250rr not starting
,
fouled plug roll start only
,
how to shut off spark plugs valve in cbr250rr
,
mc22 start on reserve
,
motorcycle wont start but turns over
,
possible causes for mc22 not starting
,
reason motorbike cannot start
Click on a term to search our site for related topics.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •