Loss of power under load
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  1. #1
    Junior Member
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    Jan 2017
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    Loss of power under load

    So I have a 1978 cx500. Built it into a cafe racer and it's been running like a dream for the entire season but then I was taking a turn at around 70mph when the motor just seized, back wheel locked up so I pull in the clutch to keep from losing control and when I level out I pop the clutch, motor starts back up but I've lost almost all power and when I'd stop it would die unless it was in neutral.

    Checked the oil and it was low but I don't see oil in the coolant so I don't think the head gasket was compromised. Changed the spark plugs and checked the coils. Both have spark but it seems like it's running on one cylinder under load...

    Anybody have any experience with this?

  2. #2
    Senior Member
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    Apr 2011
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    Lexington NC
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    Let me make a wild leap do you have a temp gauge Remove the oil filter cartridge and look at it under a bright light See if you see any copper flecks
    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

  3. #3
    Junior Member
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    Jan 2017
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    If I remember correctly it was overheating but not bad. Wouldn't copper flakes be more attributed to an engine knock or tapping?

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  5. #4
    Senior Member
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    When these sieze as you describe It is from overheating and a piston grabbingThen it hurts a bearing Then noises startI have blown a lot of them up doing really bad things to themMy stepson did the same tjong you describe to his motor Keeping up with some of his buddys on bigger bikes,A few,says later it blew,a,rod
    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

  6. #5
    Senior Member
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    Oct 2011
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    Me thinks you need to buy a boat for that newly created "overheated but not bad" anchor.

    Don't forget the fishing pole.

    BTW, what temperature would you consider a "bad overheat"? Paint charring, rubber bubbling, aluminum melting, radiator cap blowing off.......

    engine seizure seems to be in the "overheated but not bad" grouping.
    Last edited by Knute; 01-10-2017 at 08:23 PM.

  7. #6
    Junior Member
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    Above normal operating temperature. That's what I meant

  8. #7
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    And not until after the seizure.

  9. #8
    Senior Member
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    To Murray's question.

    Do you have a temperature gauge?

  10. #9
    Senior Member
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    Lexington NC
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    He has said he doesTo the poster check the filter and change the oilBefore doing much more
    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

  11. #10
    Senior Member
    Join Date
    Apr 2011
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    Lexington NC
    Posts
    19,176
    Oops double post
    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

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