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  1. #1

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    So, I can only get 85 mph out of my 1980 CX500. Any tips out there on how to get better performance out of her. I'm new at this stuff, so any help is much appreciated.

  2. #2
    Toehead's Avatar
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    Quote Originally Posted by NW CXer View Post
    So, I can only get 85 mph out of my 1980 CX500. Any tips out there on how to get better performance out of her. I'm new at this stuff, so any help is much appreciated.
    It sounds like you might have some carb-related problems. A general tune-up and carb cleaning should do wonders.
    1980 CX500C, All around road warrior

    1975 TS125 (Sold), old smoker

    1985 Camaro Berlinetta, V8 swap summer fun

    2002 WRX, Daily fun

    1977 naked GL1000, Highway cruiser

  3. #3
    bear351c's Avatar
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    Yep, carb o/haul will do it wonders. You'll think it's a different bike.
    It's not what you ride, just that you do.



    1978 CX500 Chopper in progress.

  4. #4
    Senior Member rickbert's Avatar
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    Why would you wanna go faster than 85 mph on a motorcycle ?

  5. #5

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    Chattanooga, TN
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    Could also be your cdi box. Had that happen on mine full throttle and she just wouldn't go faster than 80. Changed my cdi and then she would run up to 120.
    Dirty Rice: 1979 Honda CX500C

    Red Rocket: 1985 Yamaha XJ700 Maxim
    FOR SALE $1300 OBO



    [quote name='DakotaMK' date='30 January 2011 - 10:43 AM' timestamp='1296402219' post='40522']

    ....interesting



    double sided tape, rubber cement, superglue..... You make a post others chime in and you use a GLUESTICK?!?!??? [/quote]

  6. #6
    Senior Member bandit's Avatar
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    Quote Originally Posted by crashxj View Post
    Could also be your cdi box. Had that happen on mine full throttle and she just wouldn't go faster than 80. Changed my cdi and then she would run up to 120.
    does your 1979 500 really do 120mph
    1981 GL500 , UK MODEL,needing a bit of tender loving care

    1982 GL500 , UK MODEL,my daily ride.



    Andalucia,in the south of spain

    aka spanish bandit

  7. #7
    Senior Member rickbert's Avatar
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    Quote Originally Posted by bandit View Post
    does your 1979 500 really do 120mph


    What runs thru my mind when I read that is: How do you know you were going 120mph when our speedos only go up to 85mph ? Or did you have an aftermarket speedo on it ?

  8. #8
    Senior Member bandit's Avatar
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    Quote Originally Posted by rickbert View Post
    What runs thru my mind when I read that is: How do you know you were going 120mph when our speedos only go up to 85mph ? Or did you have an aftermarket speedo on it ?
    and what does the rev. counter show at 120.........
    1981 GL500 , UK MODEL,needing a bit of tender loving care

    1982 GL500 , UK MODEL,my daily ride.



    Andalucia,in the south of spain

    aka spanish bandit

  9. #9
    marshallf3's Avatar
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    I've got the factory 120 speedo on mine and as much weight as I've lost due to my illness that I haven't gained back I'm sure I could probably hit the redline in 5th with the StreetShields windshield on the front. They all differ, but I think most max out between 108 - 112.



    I don't mind driving around 95 in my car which is often the going rate down I-35 in certain parts of Texas but I wouldn't feel comfortable driving the bike at that speed. I took that Yamaha 650 Maxim (modified cam) I had for a while up to around 140 one time and it wanted to go faster but the world turned into a blur. I don't like going over 75 on my bike and prefer less, even if I've got to move over to the right to let the cars go by.
    1979 CX500 Custom - restored to almost original condition. I'm waiting to get strong enough to return to work so I can finish all the painting prep and priming, then I'll take the tank and sides out to Old Okie's shop where the bike is and shoot the color, clear, apply decals and final clear then polish it to a perfect gloss.



    I also have the tendency to misspell or add things later to a post so check again a bit later.

    *Click here to e-mail me

  10. #10
    Senior Member rickbert's Avatar
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    Between 70-75 is about as fast as I ever go on mine as well.....it just works the engine too hard to go much faster IMO.



    That being said IF you're truly going 125mph would you not be constantly red-lining the tach which you should NOT do ? Isn't that why the red-line is there so that you do not exceed that point ?

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