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  1. #1

    Join Date
    Feb 2011
    Location
    wisconsin
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    Hey everybody

    I'm in the process of building a rat/chopper CX500 out of a 78'model. The chop and rake went very well. Still have a ways to go but its mostly cosmetics. I love customs, but i really love customs of all sorts that are fast. Not a fan of stock motors. LOL! I know these bikes weren't meant for torque or power. Every motor has its secrets to gain horsepower. My 78' is coming along great but is still a stock motor. I build snowmobile oval race sled engines and really don't have any leads on parts, and or modifications i can do. Andy ideas?
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    78' CX500 rat/chopper project in progress. 80' CX500 parts bike and a few extra parts from another 78'. Build custom vintage and late model ice oval race sleds. Anything with a motor interests me.

  2. #2
    Super Moderator CXPHREAK's Avatar
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    Aug 2010
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    South Australia
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    Welcome mate. That looks pretty cool. There's really very little in the way of performance parts available for these motors though there is a thread running on performance cams.

    The first thing you can do is make sure your motor is in good order and tune.

    You can maybe pick up a couple of extra horsepower with a slight head skim to raise compression but of course you would have to C.C. the heads to ensure equal volume. A 2 into 1 exhaust may liberate a pony or two and the weight loss would probably be equivilent to another horse in itself. K +N pod filters, a rejet and maybe a bit of port polishing are probably the limits of what can be done short of installing 650 valves and seats.

    Losing the centre stand makes a further weight saving and with your bikes altered stance may be unusable anyway.

    Of course, this is still a considerable amount of work for what would likely only be minor gains in power with possible {if not probable} undesirable effects on reliability and longevity.

    While these motors have a fair amount of bottom end grunt they were never intended to be a performance bike,- perhaps better to appreciate it for what it is and just personalise it as you have been doing? Your choice.

    P.S., the 16 inch back wheel from a custom will suit your build better and improve accelleration, but at the expense of top speed.
    Help with handlebar and ignition switches.

    http://cxgl.wikispaces.com/Rebuildin...lebar+switches

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

    RTFM

  3. #3
    Senior Member
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    Aug 2010
    Location
    Saginaw, Michigan USA 3rd stone from the sun
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    860
    Iceracer welcome to the forum. I too would like a bit more power. "Scudman" has a set of snowmobile carburetors on one CX and working on a second for his friend. The carbs are snowmobile sourced TM-38 flatslides so this is right up your alley! I'm bidding on a set right now and will do this mod for sure. I'd be interested in your input n this setup because of your experience building performance motors for sleds. These are common on many 600/700cc twin cylinder Polaris. I'm in Michigan so sledding is the same as Wisconsin very popular This last summer I went to my first asphalt drags WOW we watched a guy set the world record full quarter mile. BTW we got over a foot of snow here today and still coming hard.

    I would think flowing the heads to match the increase in the flatslides flow. I have a set of two into one stepped headers I scratch built, the first tube is 1.5" then 1.625" the merge 2/1 to 2.25" out into a sport bike carbon slip on that I shortened to 12" from the original 15". The bike needs a cam to match these other basic hot rodder mods. Let it breath a bit.

    Cheers, 50gary

  4. #4
    Senior Member 79cx500's Avatar
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    Jan 2011
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    Lenoir, NC
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    467
    Not to thread jack from the OP but can the 650 just swap in place of the 500?
    I ride a Murray Machine...you won't catch me.

  5. #5
    Senior Member cdyoung1985's Avatar
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    Aug 2010
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    Southwest MI
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    I've seen threads somewhere on the 500-650 swap, and it's possible, but I think it took a good bit of modding the brackets and what not... And if you want reliability, I wouldn't modify the motor. But if you want power and speed, I'd go for the 650 turbo motor, you'd need the throttle body etc, but it'll give you the speed. I was considering trying to make my bike faster, but I'll stick with doing small simple things, mainly the 2-1 exhaust and a good carb cleaning and rejetting to go with the exhaust. I'd like to turn mine into a chopper, but before I do that I need a new daily driver, because a hard tail and 50+ miles a day everyday there isn't snow doesn't sound too pleasant, so I'm working on saving for a V-Max
    81 CX500C daily rider

    80 CX500C parting out

    83 GL650I parting out

  6. #6
    Senior Member timothy_d's Avatar
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    Aug 2010
    Location
    Sebastopol, CA
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    2,318
    Rookie statement.



    650T motor cannot be shovelled into a 500 deluxe, custom, or standard. Wrong frame, wrong clearances, not enough structural support for the weight.



    650C, E or GL650 motor can be used, in fact, that's where this forum came from. Chopper Charles' bike was a 500 with a 650C motor.
    Currently own, '78 CX500, '82 CX500T, '83 CX650E, '08 DR-Z400 SM

    Previously owned: CX500T (x3), CX650T, CX 650C, GL650I, '81 CX500D (x2), CB750F SS (x2) CB750K (x2), CB450/2, CB350/4,
    BMW R-60/6, Suzuki GS450T, GS550E, GS1000E

  7. #7
    Senior Member americanclassic's Avatar
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    Aug 2010
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    There is nearly no following for after market parts. The Mac 2n1 exhaust is about it. Get your carbs SUPER clean, and shed weight.
    '81 GL

  8. #8
    Senior Member
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    New Orleans
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    I wonder if anyone has shot nitrous to a CX. 650 cam in a 500 motor ? For the somewhat technically inclined a microsquirt fuel injection syst?









    82 CX500c



    SPRINT... the worst cell phone company ever IMHO.

  9. #9
    Mike_R's Avatar
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    Aug 2010
    Location
    Kirkland, WA
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    115
    Would any of you know if the Mac 2n1 exhaust only have the muffler on the right side of the bike?

    Kid of a stupid question, but I am just curious for aesthetic purposes...



    EDIT: also does it decrease the clearance of the bike at all? All the pictures look like its lower
    '79 CX500c

  10. #10
    Senior Member
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    Aug 2010
    Location
    Saginaw, Michigan USA 3rd stone from the sun
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    860
    If you're meaning less clearance in cornering, I'd say it will increase the clearance? I have my own two nto one and I have much greater ground clearance.

    Cheers, 50gary

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