power loss from 4000 to 5500 rpm under load
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  1. #1
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    The bike runs fine for the first 10k then from 4000 to 5500 rpm if you try to accelertate it bogs down.

    If you accelerate very slowly it is ok.

    It also cruises fine in this rpm range but need to gear down to get the rpm over 5500 to pass or climb a hill

    I have swaped out the cdi unit ( didn't make a difference )

    I put new plug ends on when I put the new plug ends on it worked fine untill I had put 150k on then the trouble started again.
    1978 CX 500

  2. #2
    Super Moderator CXPHREAK's Avatar
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    Low speed coils anyone?
    Rebuilding Handlebar Switches

    http://s1085.photobucket.com/user/CXPHREAK/library/Switchgear%20rebuild?sort=6&page=1

    Rider 81 500C, Thingy Born a 78Z. Ozdeluxe born an 80 shadow.

    GET A MULTIMETER RTFM I am a CX500. If you maintain me I will run forever.

    http://cx500forum.com/mediawiki/inde...itle=Main_Page

  3. #3
    Senior Member King_Panther13's Avatar
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    My bike has seemingly been doing this or something similar lately, though I don't know the exact RPMs...haven't payed attention, which is why I haven't started a thread on it yet. I have rebuilt plug caps, iridium plugs, tecoparts coils, and an ignitech. It does seem kind of...off...when accelerating through the 4500-5500 range, but I really can't describe it. It's especially noticeable when engine braking a bit before a curve until the engine gets around the 5000 RPM mark, and then trying to accelerate. It feels kind of jumpy...not smooth at all.



    Anyhow, Longhaul, you should invest in an ignitech, and all of the other things I've listed. It should take care of your issues, I doubt that they are something other than ignition related. I'm just stating my issues to see if I can prod the hivemind to saying what else could cause it other than ignition.



    Or it could be the carbs needing cleaned too. Never know.
    1980 Honda CX500C-Ignitech, Tecoparts Coils, Iridium Plugs, Rebuilt Plug Caps, Electric Fan, '78 Standard Wheels

    1973 Honda CB500/550

    1981 Honda CX500C-Newest addition to the family

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  5. #4
    Senior Member TonyR's Avatar
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    Quote Originally Posted by CXPHREAK View Post
    Low speed coils anyone?
    I would vote CDI except he said he swapped it.

    High voltage winding in the stator?
    1978 CX500 Running and Looking good
    1980 KZ250 LTD Single - Current paint victim... er ... project.
    1977 GL1000 NGW current project.

    Any day I ride to work is a better day than any day I drive to work.
    Any day I drive to work is a better day than any day I walk to work.
    Any day I walk to work is a better day than any day I am too sick to work.
    Any day I get to ride around all day and not go to work is beautiful!

  6. #5
    Senior Member tensleep's Avatar
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    http://cx500forum.com/index.php?/top...__1#entry49400



    Try this link - I searched High Speed Windings to find it. There are many more threads that describe the exact same symptoms that you are experiencing and several solutions to the problem.



    Enjoy the reading!
    1980 CX500 Custom



    "You're never too old to learn something stupid."



    "Silence is Golden,

    but Duct Tape is Silver."

  7. #6
    Senior Member Shep's Avatar
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    Even a faulty spark plug,spark plug cap or faulty coil can limit the power.



    Change the plugs and check the caps as per,



    http://globalcxglvtwins.hostingdeliv...c.php?f=8&t=84



    Check the coils as per,



    http://globalcxglvtwins.hostingdeliv...php?f=10&t=335
    I won't miss the Human Race,well maybe,"Fish-and-Chips"

  8. #7
    Junior Member
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    Thanks for your ideas I did swap out the coils as I had a couple extra made a big difference but still not perfect after 250k started failing again so I'm thinking it is a coil issue the Honda dealer near me is usless and one shop has used ones for $50.00 which I am not paying for coils 33 years old ( crook ) Is there anyone that knows of anyone near me Guelph, toronto ontario area that can help. I can get new ones from a shop in British columbia but will take 3 weeks I really wanted to go on this trip in a week and a half but dosen`t look like it is going to happen
    1978 CX 500

  9. #8
    Senior Member TonyR's Avatar
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    Quote Originally Posted by longhaul View Post
    Thanks for your ideas I did swap out the coils as I had a couple extra made a big difference but still not perfect after 250k started failing again so I'm thinking it is a coil issue the Honda dealer near me is usless and one shop has used ones for $50.00 which I am not paying for coils 33 years old ( crook ) Is there anyone that knows of anyone near me Guelph, toronto ontario area that can help. I can get new ones from a shop in British columbia but will take 3 weeks I really wanted to go on this trip in a week and a half but dosen`t look like it is going to happen


    I bought these but it took two weeks for them to get to me:



    http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT



    Seem to work well also.

    I would think any Universal CDI coil from a 250cc dirt bike could work.

    Look at local motocross shops.
    1978 CX500 Running and Looking good
    1980 KZ250 LTD Single - Current paint victim... er ... project.
    1977 GL1000 NGW current project.

    Any day I ride to work is a better day than any day I drive to work.
    Any day I drive to work is a better day than any day I walk to work.
    Any day I walk to work is a better day than any day I am too sick to work.
    Any day I get to ride around all day and not go to work is beautiful!

  10. #9
    Super Moderator CXPHREAK's Avatar
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    I'm waiting for 4 of those same coils. Hope they're good.
    Rebuilding Handlebar Switches

    http://s1085.photobucket.com/user/CXPHREAK/library/Switchgear%20rebuild?sort=6&page=1

    Rider 81 500C, Thingy Born a 78Z. Ozdeluxe born an 80 shadow.

    GET A MULTIMETER RTFM I am a CX500. If you maintain me I will run forever.

    http://cx500forum.com/mediawiki/inde...itle=Main_Page

  11. #10
    Senior Member Shep's Avatar
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    Just to clarify these coils



    http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT



    are only for CDI ignition engines.They will NOT work on the later TAI(Transistor Advanced Ignition) engines.They WILL work wit the Ignitech ignition replacement
    I won't miss the Human Race,well maybe,"Fish-and-Chips"

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