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Thread: First impression of Murray's carbs

  1. #21
    Senior Member chiangmaiglman's Avatar
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    Quote Originally Posted by ChopperCharles View Post
    How do they make the 400? Is it the same bore, just destroked? You might be able to build a 400 motor with just the crank, rods, and pistons if that's the case. It'd be a lot cheaper to send those overseas and put them in a 500 block yourself. If the block or heads are different though, that's moot.



    Charles.


    Charles/Murry



    I can't speak to the stroke, but the bore is definitely smaller by a few Millimeters as the Head Gaskets show. The Heads are different as well, with smaller valves. All in all I think it would be prohibitive to try and modify a 500 to match a 400's specs.



    I have wondered, however, about boring out the 400 to 500 spec's and replacing the relevant parts to make a 500 out of my 400. Would be nice if it were possible but Carbs, Heads and all would add up pretty fast. That said, the few 500's I've seen here are in the USD $3000 range, ouch. AND the gov here recent outlawed the import of used card and bike parts, they say its to prevent unsafe vehicles, but it's really to protect the auto and bike manufacturers here.



    The upshot for me, really, is that on a shoe string budget, and gas at USD $6.00 or so, the loss of mpg/kmpg is not really worth the added cost. Besides which, I've got Larry built carbs and I am very happy with them.



    BUT, that's just me. I'm sure there are others out there with 400's who would welcome Murry's Mikuni carbs and be able to fine tune them and work with Murry far better than I can. Shep in Europe for instance or those great folks in Australia or New Zealand.



    Mark in Thailand
    ___________________________________

    78-82 GL400 with TI ignition

  2. #22
    Senior Member justingallen's Avatar
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    Quote Originally Posted by murrayf View Post
    Justen



    do you have a comparison of mileage that you got with the stock kehins with the pod jetting?


    I averaged about 43 mpg during my trip up to San Jose from LA. Not a huge loss consider the power improvement. And it's still WAY more efficient than my car.
    1979 Honda CX500 Deluxe

  3. #23
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    and with the old setup were you also cruising 70-75 ?
    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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  5. #24
    Senior Member richnct's Avatar
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    Gasoline with 10% adrenaline mixed in definitely reduces mpg, worse than corn-a-hol.
    Sure, I'm crazy, but life is more interesting that way!

    '76 CB500T w/Velorex Hack

    '79 CX500C

    '82 GL500

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  6. #25
    Senior Member Cjames36's Avatar
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    Tell ya what Murry, Ill do a mileage check this weekend and let you know what I'm running. I know that running 55 to 60 with Keihn carbs jetted for pods, I was anywhere between 45 to 50 mpg, no kidding. I will post here Sunday night and let you know what my 500 is doing with the Minukis.
    Chris James

    1980 CX500C

  7. #26
    Administrator ChopperCharles's Avatar
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    I must say, I've NEVER gotten anywhere NEAR 50mpg on a stock CX or GL. High 30's yes, but 50mpg just was impossible. I like having fun too much!



    Charles.
    Visit my Blog: Modified Motorcycles By ChopperCharles at http://choppercharles.com

  8. #27
    Senior Member Misenhei's Avatar
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    Quote Originally Posted by ChopperCharles View Post
    I must say, I've NEVER gotten anywhere NEAR 50mpg on a stock CX or GL. High 30's yes, but 50mpg just was impossible. I like having fun too much!



    Charles.


    I always get at least 55mpg highway on my naked custom. I must ride like a puss.
    1981 CX500 Custom

  9. #28
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    i only ride 2 ways steady speed on the highway or wide open lol



    on the highway i run my gl650 or my goldwing at 70-75 mph i get around 45-47 on both of them



    in town of back roads if i am having fun i can work my mileage down as low as 28 on a 500 but its at wide open a lot



    once you guys run your bikes for a bit do a plug read at your favorite cruising rpm and let me know or see the plug color



    you may be able to adjust for a bit better gas mileage i jetted the carbs for max power so the 500s makes roughly 20 percent more power



    and if you are using it they will burn that much more There is no magic pill if you want great gas mileage leave the bike dead stock



    my job is to give you the ability to burn more fuel cleanly but the harder you twist the throttle the more



    you will burn more its always the same mathematical formula



    hp desired divided by wallet thickness x right wrist droop factor = smiles per hour
    izak likes this.
    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

  10. #29
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    This may have already been an answered question, but how do you handle bikes with vacuum petcocks?

    Does the Mikuni have a nipple for that?

  11. #30
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    just remind me when you order and i will drill and tap a nipple in the intake manifold
    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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