CBR 600F3 1995 - 1998 CBR 600F3 Forum

Hard to start please read

Old Jul 20, 2009 | 11:30 AM
  #11  
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kinda odd... if it was a problem with fuel from the tank or pump, it wouldn't run at speed. Are you sure there is absolutely no difference at all between choke off starting and choke on? Even a slight difference? I am hoping choke on makes it a little harder, because perhaps you are running too rich and soaking the plugs. Hell other than that I am not sure.
 
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Old Jul 21, 2009 | 04:36 PM
  #12  
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with start up it kinda makes it harder but with it running it does the usual as having a choke on but usually only roll start
 
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Old Jul 21, 2009 | 08:46 PM
  #13  
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Originally Posted by rellow88
with start up it kinda makes it harder but with it running it does the usual as having a choke on but usually only roll start
Choke on is harder to start? Not sure what you are saying. Try choke off, let it turn over and as soon as it starts shut it off and take a plug out. Let me know what it looks like.
 
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Old Jul 23, 2009 | 07:57 AM
  #14  
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Im having the exact same problem as u
 
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Old Jul 24, 2009 | 09:19 AM
  #15  
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was talking to someone at work he said his harley did the same thing was bad fuel lines was letting air in and the float bowls wasnt staying filled going to give that a try see how that goes
 
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Old Jul 25, 2009 | 11:24 AM
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Try changing the spark plugs.Mine does the same thing...If i give mine choke to try to start it it flouds out.then the plugs are fouled...junk ngk plugs.try starting with just a touch of throttle after changing plugs.Let me know...Beasley
 
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Old Jul 25, 2009 | 08:21 PM
  #17  
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throttle open during start leans it out, choke on richens it up. If it starts better 1 way vs another, then that helps you point to your problem.
 
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Old Jul 26, 2009 | 04:56 PM
  #18  
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i have to put the choke on when i roll start it but its also 330 am and lil cool outside when i do it but once its start it and drive 20 miles to work i work bout 2.5 hours till my break and i can go out there and start it up fine with out the choke
 
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Old Jul 26, 2009 | 05:28 PM
  #19  
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This is a classic sign of low compression. Hard to start when cold, runs when warm. I'd lay odds that either your valves are way out of spec and therefore not closing 100%, or more likely the valves seats are worn. You can compression test #1 and #4 though the side inspection covers without pulling the tank. You're look for compression higher than 160lbs IIRC.
 
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Old Jul 27, 2009 | 09:05 PM
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if it had low compression i would think it wouldnt have the same performance and if the valve seats were warn wouldnt it burn oil
 
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