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Thread: Power loss

  1. #1
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    My 1982 GL 500 has an intermittent power loss above 5000 RPM in 5th gear. It seems to run smoothly below 5000 RPM.

    I am able to power through and cruise at 70 to 75 MPH, even at higher speeds it seems to have repeated momentary power drops offs.

    At first I thought it was a cylinder missing, but the exhaust note doesn't substantiate that assumption.

    I can accelerate the engine to 9000 RPM in lower gears, it seems to run smooth.

    It seems that I have read that there is an electrical component involved (that is a question).

    I really could use some expert help.

    Thank you in advance.

  2. #2
    Senior Member DanCX500's Avatar
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    How long have you owned the bike? Have you checked the condition of the spark plug caps?

    http://cxgl.wikispaces.com/Servicing+the+Sparkplug+Caps





    (If you could put the year/model of your bike in your sig, it will help in future questions.)
    Dan :happy3:

    :blob6:My link to the cam seal delete plug
    '81 CX500c 41,000+ miles.
    CXGL WIKI<------ Check here for help!
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    Quote Originally Posted by Thumper View Post
    Always check the stupid stuff before panicking. This applies to everything in life.

  3. #3
    Super Moderator DaveF's Avatar
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    It could be several things but let's check one extremely common potential culprit first - the main fuse.
    1982 GL500I, 1983 GL650, 1983 GL650I

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  5. #4
    Senior Member DanCX500's Avatar
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    Quote Originally Posted by DaveF View Post
    It could be several things but let's check one extremely common potential culprit first - the main fuse.


    I thought about that, but ruled it out. [s]Why do you think it could be the main fuse?[/s]



    Just read the link. I agree!

    Dan :happy3:

    :blob6:My link to the cam seal delete plug
    '81 CX500c 41,000+ miles.
    CXGL WIKI<------ Check here for help!
    :blob10:
    Quote Originally Posted by Thumper View Post
    Always check the stupid stuff before panicking. This applies to everything in life.

  6. #5
    Senior Member Knute's Avatar
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    This could be caused by any number of problems. The least is a fouled plug, the most is ignition system.



    My counsel to you is to do the diagnostics first. Then get the needed parts and repair.



    Some will reply this is an ignition problem and Ignatech is the only solution. Others will say, "Carbs need service."



    Start by checking the simple things: ie fuel on?, plugs good?, HT wires good?....... Eliminate one by one working to the more complex. You will find the problem soon.



    FWIW, the problem may not be the consensus of the forum. Your bike, your situation, you will ultimately need to diagnose. If you havent got a manual, then get one. The Factory Service Manual can be downloaded from WIKI, I beleive. Other manual like Clymers or Haynes also have high value.







    I had a similar issue. Turned out to be a pair of bad coils. IIRC, my fix was about $30 for a pair of new coils.
    1981 CX500C

  7. #6
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    sounds like fuel starvation



    check the vacuum line from the right carb to the petcock for age cracks or tears



    check the fuel screen in the tank and do a temporary by pass of the vacuum petcock then take it for a ride and see if that makes any difference
    GET AN OIL FILTER ADAPTER

    Order The Quick Build Exhaust Pipes


    GET A QUICKSET VALVE TOOL


    Way to many bikes to maintain this list LOL !!

    email me at murray at murrayscarbs.com

  8. #7
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    Quote Originally Posted by DanCX500 View Post
    How long have you owned the bike? Have you checked the condition of the spark plug caps?

    http://cxgl.wikispaces.com/Servicing+the+Sparkplug+Caps





    (If you could put the year/model of your bike in your sig, it will help in future questions.)


    Hi,

    First thank you for responding.

    I have new plugs that I have gaped per spec.

    My bike is an 82GL with 35,000 miles.

    The bike has behaved this way since I bought it about 2 months ago.

    I hope this helps with your analysis.

  9. #8
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    Quote Originally Posted by DaveF View Post
    It could be several things but let's check one extremely common potential culprit first - the main fuse.




    Is there a way to check the Main Fuse short of replacing it?

    If it were a cracked fuse, it seems odd that the problem is always starts at the same RPM in the same gear.

    It would seem more likely it would occur at random times with changing temperature, vibration, etc.

  10. #9
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    Quote Originally Posted by Knute View Post
    This could be caused by any number of problems. The least is a fouled plug, the most is ignition system.



    My counsel to you is to do the diagnostics first. Then get the needed parts and repair.



    Some will reply this is an ignition problem and Ignatech is the only solution. Others will say, "Carbs need service."



    Start by checking the simple things: ie fuel on?, plugs good?, HT wires good?....... Eliminate one by one working to the more complex. You will find the problem soon.



    FWIW, the problem may not be the consensus of the forum. Your bike, your situation, you will ultimately need to diagnose. If you havent got a manual, then get one. The Factory Service Manual can be downloaded from WIKI, I beleive. Other manual like Clymers or Haynes also have high value.







    I had a similar issue. Turned out to be a pair of bad coils. IIRC, my fix was about $30 for a pair of new coils.


    Thank you for your response.

    The interesting thing is, the engine runs smooth up to 9,000 RPM in 2nd gear.

    I can power through the problem area and accelerate to 75 MPH in 5th gear.

    It still has these minor hesitations, but it will go.

    I would appreciate any diagnostic hints regarding the colis.

  11. #10
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    Quote Originally Posted by murrayf View Post
    sounds like fuel starvation



    check the vacuum line from the right carb to the petcock for age cracks or tears



    check the fuel screen in the tank and do a temporary by pass of the vacuum petcock then take it for a ride and see if that makes any difference




    OK, I will do all of that, but if it is vacuum leak or fuel starvation, would not the problem get worse with RPM?

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