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not starting after emptying and re-filling tank

Discussion in 'FZR250.com - Archives' started by chiangstar, May 7, 2006.

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  1. chiangstar

    chiangstar New Member

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    hey guys

    i did some work on my bike over the last 4 months or so and during that time, i disconnected my fuel tank and battery. ive since completed 95% of the work and i put the fuel back in and the bike wont start...

    im thinking that it might be my fuel pump because it primed for a hell of a long time while trying to fill those pipes back up with fuel... im scared that it might have burnt itself out... is this likely or unlikely?

    when i look at the fuel filter, i can see it half full of fluid (fuel) and im not sure if its meant to be full or if half full is normal...

    i checked the spark plugs and they seem fine. i guess changing them wont hurt and ill look into that during the week, but for the moment, all it does is crank until the battery runs out.

    any ideas?

    simon
     
    chiangstar, May 7, 2006
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  2. dave

    dave Well-Known Member

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    if the filter is laying on its side it will trap air in it but this is not usually a problem as fuel only has to get just above the outlet to pass thru.

    Make sure the battery is fully charged before trying to start as the CDI will not fire the ignition below a certain volts.

    THree things needed for engine to go.
    1 - spark
    2 - Fuel
    3 - Compression


    1 pull out a plug and see if there is spark

    2 open the fuel drain plug on one of the carbs to see if anything comes out. Is the fuel tap turned on, is there fuel in the tank, is the fuel pump working.

    3 check the compression with a compression tester should be over 100psi
    if not give the engine a good spray of CRC in each carb throat to help seal up rings and valves temporarily
     
    dave, May 8, 2006
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  3. FZR Dude

    FZR Dude New Member

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    I just rebuilt my motor and when I started it up, I had to hit the run/stop switch 7 times to prime my carbs. Another thing I did before starting was to disconnect the headlight(s) before starting (saves a little energy). Mine started first try w/o choke.

    Make sure there are no kinks in the fuel line going to the carbs from the pump.
     
    FZR Dude, May 8, 2006
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  4. chiangstar

    chiangstar New Member

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    thanks for the tips guys...

    if theres one thing i know nothing about, its carbs... ill have to look into the carb drain plug and im going to change the spark plugs this week.

    i'll let you know how i go

    cheers

    simon
     
    chiangstar, May 8, 2006
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  5. chiangstar

    chiangstar New Member

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    oh sorry for the double post, but how long does it take for fuel to go bad? the fuel i put in the tank was sitting in a jerry can for the past 4 months... its the fuel i took out of the bike. it shouldnt be a problem should it??

    thanks

    simon
     
    chiangstar, May 8, 2006
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  6. Casso

    Casso New Member

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    maybe a silly question, but did you turn the fuel tap back to on?
     
    Casso, May 8, 2006
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  7. dave

    dave Well-Known Member

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    Should be ok at 4 months. I have petrol sitting around over winter for my offroad buggy and it can be about 6 months of no use and still ok.
     
    dave, May 8, 2006
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  8. ACE

    ACE Active Member

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    du's the fule smell off or dif in any way
     
    ACE, May 8, 2006
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  9. chiangstar

    chiangstar New Member

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    yeah the fuel tap is on :p

    i thought the fuel might be off so i drained it and put fresh fuel in there and the same is still happening... the fuel pump pumps fuel into the carbies as soon as i flicked the bikes on switch

    i took the spark plugs out and cleaned them and there definitely is spark...

    im totally stumped

    simon
     
    chiangstar, May 9, 2006
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  10. ACE

    ACE Active Member

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    Are the plugs dry or wet
     
    ACE, May 9, 2006
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  11. chiangstar

    chiangstar New Member

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    good question... im not sure... i'll have to test that out tomorrow...

    what does it mean if they are wet/dry?

    simon
     
    chiangstar, May 9, 2006
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  12. FZR Dude

    FZR Dude New Member

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    Wet means fouled. Either gas or oil. My guess is gas.
     
    FZR Dude, May 9, 2006
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  13. chiangstar

    chiangstar New Member

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    ok... so i changed the spark plug and still nuthin...

    i took one of the spark plugs out and it smelt of fuel...

    one thing i did notice was that if i drain the carbies and turn the bike on, the fule pump pumps quite a bit of fuel back into the carbies... is this normal?

    anyway, so i have spark, i have fuel... the only other engine related thing that i really touched was the exhaust...

    simon
     
    chiangstar, May 9, 2006
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  14. koma

    koma New Member

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    Yes, if you drain the float bowls of course the fuel pump has to refill them to the correct level. Nothing wrong there.
     
    koma, May 10, 2006
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  15. chiangstar

    chiangstar New Member

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    ok heres someting interesting...

    sprayed carby cleaner into the carbs and it started but it was revving its tits off as soon as it started... so i drained the bowls and tried to start again and nuthin.... it runs on carby cleaner but not fuel...

    regular unleaded fuel... fresh fuel at that...

    anyone got any ideas?

    thanks again

    simon
     
    chiangstar, May 11, 2006
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  16. Dan

    Dan New Member

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    try turning the idle stop screw out (the one in the middle of the carbies) and see if it revs less when you get her going...

    does it only run for a short time ie when u spray the carby cleaner and then stop?

    another thing to try is putting fuel directly into the carbies, the easiest way of doing this is to blow in the two black pipes that come out of the top of the carbies (that clip onto to the side of the air cleaner) and this will make fuel trickle down into the carbies then try and start her again and see if you get ignition
     
    Dan, May 11, 2006
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  17. dave

    dave Well-Known Member

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    Sounds like your jets are blocked or gummed up, seeing it runs on carb cleaner. It sounds like its not getting enough fuel.
     
    dave, May 11, 2006
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  18. ACE

    ACE Active Member

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    when you put the spray in it did you have the air box of if so did the carbs open when it reved up
     
    ACE, May 11, 2006
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  19. chiangstar

    chiangstar New Member

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    the airbox was open... but i had the air filter in the airbox when i stared it so i didnt see... ill have to have a look next time...

    when it was running on carby cleaner, i didnt let it rev for too long cos it sounded like it was going to explode... revving pretty high,... a bit scary to hear that wile its sitting still...

    im gonna clean the carbs out this weekend and ill let you guys know how i go

    should also have some pics ready soon too...

    cheers

    simon
     
    chiangstar, May 11, 2006
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  20. ACE

    ACE Active Member

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    hav you played with idal at all
     
    ACE, May 11, 2006
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