LX579 Sensors are not created Equal
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  1. #1
    Senior Member johnste1960's Avatar
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    BEWARE = LX579 Sensors are not created Equal

    I have been struggling with the simple sensor upgrade this weekend.

    In talking to to one forum member for guidance, I was informed that some of the new sensors did not fit. I was told to use the SMC sensor In looking at my stock that I had allready purchased, I found that mine were SMP (Standard Motor Products) I assumed that the info I was told had the wrong acronym as I could not find any SMC sesnsors.

    In proceeded but later found out that the ones that I had did not work. Actually I had purchased 3 sensors from the same source. The odd thing was that one of them was OK and two of them did not work. Below is a picture showing them. The one on the left does not work as many of the pysical dimensions, while close to the original, are larger. These are critical enough that it does not fit in the cutout area in the sensor plate. I have been trying to use a dremel tool to cut it down but this is going very slowly. As a result, I am on the hunt to find a source for these sensors that provides the one that fit our applications.



    If you look closely, the one that worked is marked JAPAN, and has a part number stamped on it. I cannot read the part number. I am not sure if meaningful, but both the sensors that did not worrk had the green colored core area. The picture below shows the markings on the sensor that would have worked.

    Current Bikes: cx500t1, cx500t2, cx500t3=UK version, cx650t 1979 CBX zx750E1 (750 turbo#1), zx750E2(750turbo#2 -parts bike but planning to completely rebuild), zx750E1(750turbo#3 -high performance build, shooting for 150HP), 1973 H1-500, 1974 H1-500, 1974 H2-750, 2014 BMW K1600GTL-Exclusive, 1984 Honda Interceptor 1000:blob10:


    Previous Bikes: CB500T, 1974 Kawasaki 900 z1, 1989 Yamaha Vmax, 2008 HD soft tail custom

  2. #2
    Senior Member Noir's Avatar
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    I don't remember how old it was, but I posted replacement sensor unit, swapping from Suzuki.
    Some Suzuki are using exactly the same speed sensor distributed by ND, Nippon Denso.
    Living with: 82 CX500TC, 85 VF1000R, 09 Piaggio MP3

    Lived with: 74 RS750Z, 74 MT250, 76 CB400Fx2, 77 CB750FII, 79 CX400C, 80 CB750F, 81 RD350LC, 82 XZ550, 83 CB1100F, 83 VF750F, 85 VF1000Rx3, 92 CBR900RR

  3. #3
    Senior Member johnste1960's Avatar
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    Quote Originally Posted by Noir View Post
    I don't remember how old it was, but I posted replacement sensor unit, swapping from Suzuki.
    Some Suzuki are using exactly the same speed sensor distributed by ND, Nippon Denso.

    OK I could be confused or could have missed something but I thought the Suzuki information was for the pressure sensors that replace the P one sensor. for the crankshaft position sensor's I remember people talking about Toyota replacements (lx579). PiM has also given me information about the sensor in a gold wing Aspincade in the 19 75/76 timeframe. I have confirm that the Gold wing sensors are identical I just need to find some of those however I would rather than buying something 34 years old to replace something 34 years old I would like to buy a new replacement if that's possible . From the information I have a red people are finding new sensors at work it's just that I seem to have stumbled across it combination of something at work and some that do not work or require a lot of grinding and some adjustment to make them fit . If someone knows of a source to buy some exact drop in replacements that's information I would like to find. They do exist because I bought three from the same person to that don't fit in one that does .

    Based on your information when I get home tonight I will try searching for Suzuki or Nippon Denso or by you as author, that mayyield better search results .

    Thanks for the feedback
    Current Bikes: cx500t1, cx500t2, cx500t3=UK version, cx650t 1979 CBX zx750E1 (750 turbo#1), zx750E2(750turbo#2 -parts bike but planning to completely rebuild), zx750E1(750turbo#3 -high performance build, shooting for 150HP), 1973 H1-500, 1974 H1-500, 1974 H2-750, 2014 BMW K1600GTL-Exclusive, 1984 Honda Interceptor 1000:blob10:


    Previous Bikes: CB500T, 1974 Kawasaki 900 z1, 1989 Yamaha Vmax, 2008 HD soft tail custom

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  5. #4
    Senior Member Pim205GTI's Avatar
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    Quote Originally Posted by Noir View Post
    Some Suzuki are using exactly the same speed sensor distributed by ND, Nippon Denso.
    Noir is right, these can be found on the GSX, GSXR models



    But if I remember correctly , our member DutchTurbo tried to use them, the only problem was that the wires got brittle and stiff because of the heat inside the engine
    Golden Boomerang Wheels Rock



    CX500TC - summerfun

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  6. #5
    Senior Member dutchturbo's Avatar
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    I don't understand these coils with green will not work when the resistance is between 100 and 250 Ohms. If the green ones don't match that resistance they sure will not work.
    Nobody ever talks about the resistance but it is wise to measure them before you mount them. My LX579 measure 190 Ohm so they are good for the job.
    And also very important: wrong polarity will not work either.

    I have bought a Suzuki GSXR sensor including the wiring but this was not a success. The wires were hardened and brittle cause of the heat from the engine and broke when you tried to bend them.
    83 CX650T 2x

  7. #6
    Senior Member johnste1960's Avatar
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    Quote Originally Posted by dutchturbo View Post
    I don't understand these coils with green will not work when the resistance is between 100 and 250 Ohms. If the green ones don't match that resistance they sure will not work.
    Nobody ever talks about the resistance but it is wise to measure them before you mount them. My LX579 measure 190 Ohm so they are good for the job.
    And also very important: wrong polarity will not work either.

    I have bought a Suzuki GSXR sensor including the wiring but this was not a success. The wires were hardened and brittle cause of the heat from the engine and broke when you tried to bend them.
    I believe they will work, electrically. All I am saying is that the potted housing is larger than the origninal such that it will not fit in the mounting plate without some physical grinding down of the case or grinding the mounting plate larger.

    I think sensors are more readily available than the mounting bracket, so I am a little reluctant to grind on that. I am using a dremel tool to grind away at the plastic housing in areas such that it will fit. This is turning out to be a pain in the rear.

    Would be much better to find a new senstr that just fits. Like I said, I ordered three from one source and got two knockoffs and one original, so it seems like there are new ones outthere with the profile that will fit. I am just trying to find a method of being able to order so you know you are going to get the correct onel.
    Current Bikes: cx500t1, cx500t2, cx500t3=UK version, cx650t 1979 CBX zx750E1 (750 turbo#1), zx750E2(750turbo#2 -parts bike but planning to completely rebuild), zx750E1(750turbo#3 -high performance build, shooting for 150HP), 1973 H1-500, 1974 H1-500, 1974 H2-750, 2014 BMW K1600GTL-Exclusive, 1984 Honda Interceptor 1000:blob10:


    Previous Bikes: CB500T, 1974 Kawasaki 900 z1, 1989 Yamaha Vmax, 2008 HD soft tail custom

  8. #7
    Senior Member Noir's Avatar
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    Quote Originally Posted by johnste1960 View Post
    OK I could be confused or could have missed something but I thought the Suzuki information was for the pressure sensors that replace the P one sensor. for the crankshaft position sensor's I remember people talking about Toyota replacements (lx579). PiM has also given me information about the sensor in a gold wing Aspincade in the 19 75/76 timeframe. I have confirm that the Gold wing sensors are identical I just need to find some of those however I would rather than buying something 34 years old to replace something 34 years old I would like to buy a new replacement if that's possible . From the information I have a red people are finding new sensors at work it's just that I seem to have stumbled across it combination of something at work and some that do not work or require a lot of grinding and some adjustment to make them fit . If someone knows of a source to buy some exact drop in replacements that's information I would like to find. They do exist because I bought three from the same person to that don't fit in one that does .

    Based on your information when I get home tonight I will try searching for Suzuki or Nippon Denso or by you as author, that mayyield better search results .

    Thanks for the feedback

    Let me clear the one thing. My reply was posted since I thought you are working on a "Engine Speedo Sensor." If I were mistaken, please just ignore. lol

    Sensors Suzuki using are totally identical as the CX-T uses, but you can't swap the assembly unit. You need to use CX-T's base plate and adapter to reconstruct exact the same height as CX-T has.

    Best regards,
    Living with: 82 CX500TC, 85 VF1000R, 09 Piaggio MP3

    Lived with: 74 RS750Z, 74 MT250, 76 CB400Fx2, 77 CB750FII, 79 CX400C, 80 CB750F, 81 RD350LC, 82 XZ550, 83 CB1100F, 83 VF750F, 85 VF1000Rx3, 92 CBR900RR

  9. #8
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    I've found that some other brands/ manufacturers don't have the same shape/design to the body. That is why it is important to use Standard Motor Company replacements. SMP LX579 fit perfect...

    PK

  10. #9
    Senior Member johnste1960's Avatar
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    Quote Originally Posted by CXTURBOBOOST View Post
    I've found that some other brands/ manufacturers don't have the same shape/design to the body. That is why it is important to use Standard Motor Company replacements. SMP LX579 fit perfect...

    PK
    hey Pete, Sort of hoped you would drop in as I talked with you about this. One thing I was confused at is I could not find a sensor from Standard Motor Company. I did find that I had sensors from SMP or Standard Motor Product. Is this what you meant? In any event, I ordered 3 sensors from one source on the internet all described as SMP. However when I got them, Two were one kind and the third was different. The two similar ones were like you stated and did not have the correct pyysical fit. The third did, so like you said, there are new sensors out there that do fit exactly. I noticed the one that fit was marked "JAPAN? and had a part number on it that I could not read. Maybe if I get a magnifying glass I can read it, I will have to take a look.
    Current Bikes: cx500t1, cx500t2, cx500t3=UK version, cx650t 1979 CBX zx750E1 (750 turbo#1), zx750E2(750turbo#2 -parts bike but planning to completely rebuild), zx750E1(750turbo#3 -high performance build, shooting for 150HP), 1973 H1-500, 1974 H1-500, 1974 H2-750, 2014 BMW K1600GTL-Exclusive, 1984 Honda Interceptor 1000:blob10:


    Previous Bikes: CB500T, 1974 Kawasaki 900 z1, 1989 Yamaha Vmax, 2008 HD soft tail custom

  11. #10
    Senior Member johnste1960's Avatar
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    Tonight I did some work on thise. Here are some resistance Readings.

    a) The original BLUE WIRE SENSOR measured 163.1 ohms
    b) The original YELLOW WIRE SENSOR measured 162.6 ohm
    c) One of the new GREEN FACED sensors that do not fit measured 176.4 ohms (I had this one in the BLUE WIRE POSITION NOTE that measurement includes the wire length and connector terminals)
    d)The second new GREEN FACED sensors that do not fit measured 175.8 ohms (I had this one in the YELLOW WIRE POSITION NOTE that measurement includes the wire length and connector terminals)
    e) finally, I had a new sensor that fits exactly, this is the one that is marked with JAPAN. It measured 174.6 ohms.

    I personally am not sure what the spec says, but from the information I have read from everyone else, I beleive all of the above sensors to be IN SPEC and usable. I thought I read someone say less than 200 ohms.
    Current Bikes: cx500t1, cx500t2, cx500t3=UK version, cx650t 1979 CBX zx750E1 (750 turbo#1), zx750E2(750turbo#2 -parts bike but planning to completely rebuild), zx750E1(750turbo#3 -high performance build, shooting for 150HP), 1973 H1-500, 1974 H1-500, 1974 H2-750, 2014 BMW K1600GTL-Exclusive, 1984 Honda Interceptor 1000:blob10:


    Previous Bikes: CB500T, 1974 Kawasaki 900 z1, 1989 Yamaha Vmax, 2008 HD soft tail custom

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