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Thread: Stock Tachometers, How to add one

  1. #21
    Super Moderator longdistancerider's Avatar
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    Re: Stock Tachometers, How to add one

    Nicely done and fills in all the blanks with pictures and descriptions.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

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  2. #22
    Junior Member xxbradxx's Avatar
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    Help with Installing new Tach CABLE, not Guage.

    Apologies for a newbie resurrecting an old thread, but I just purchased a very cherry 1080 CM400T for my girlfriend.

    I do not need assistance with installing a tach, already did that. I replaced the old Tach which failed with a used original in great shape i got off eBay, but am afraid I need to replace the tach cable also because the inner cable doesn't spin. I have tried to manually jiggle it, twist it and wiggle the piece that connects to the crank case to no avail. I think it is either broken in the housing or twisted on itself and jammed up in the housing. I purchased a NEW cable (reproduced PN 37260-MC9-860) hat doesn't appear to have a gasket at the crankcase end (see photo). Is there supposed to be a gasket/o-ring between the cable end and crankcase? What keeps oil from spewing out exactly (see attached photo)? It was $15 from a USA seller, figured I'd try it out.

    Stock Tachometers, How to add one-10044092.jpgStock Tachometers, How to add one-img_5530.jpgStock Tachometers, How to add one-img_5528.jpg
    And, does replacing the tach cable in fact require the removal of the right header and right crank case cover, just so I am clear? I am assuming I'll need to drain the engine oil before removing the cover. Are there any other important things to note before jumping into this?


    I downloaded the Honda "Shop Manual" for 1979-19814 BC/CM 400's but NOWHERE in this entire manual does it show how to do this or even reference that these bikes have guages! I'm not sure why people say the original manual is the way to go...

    Thanks!

  3. #23
    Senior Member dtsmjr8dan's Avatar
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    There is one screw in the side cover holding the cable in. It fits into that groove at the end of the cable in your picture. The 'O' ring is in there to seal it. Remove the screw, pull the cable out, install new cable lining up drive slot, re install screw, done.
    1979 CM400T (rider),
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (parts bike)
    1982 CB450 (parts bike)
    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.
    Remember, today is the tomorrow we worried about yesterday.
    My chest fell, but, fortunately, my belt caught it.
    I don't know everything, nor, have I met the one who does.

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  5. #24
    Junior Member xxbradxx's Avatar
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    Thank you!

    Again, it doesn't appear that the replacement cable has an o-ring. The current cable leaks a little bit at the junction with the case. I'll need a new o-ring. Do you know what size? The Honda Repair Manual doesn't reference this subject at all.

    Cheers

    Stock Tachometers, How to add one-img_5531.jpgStock Tachometers, How to add one-img_5530.jpg

  6. #25
    Senior Member dtsmjr8dan's Avatar
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    1979 CM400T (rider),
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (parts bike)
    1982 CB450 (parts bike)
    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.
    Remember, today is the tomorrow we worried about yesterday.
    My chest fell, but, fortunately, my belt caught it.
    I don't know everything, nor, have I met the one who does.

    T-shirt sales supporting 66Sprint's LSR Build http://www.hondatwins.net/forums/22-...d-attempt.html

  7. #26
    Junior Member xxbradxx's Avatar
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    I saw a youtube video where someone was replacing this. I don't think I have the same crankcase cover on the 1980 CM400 as the 1979.

  8. #27
    Junior Member xxbradxx's Avatar
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    This is the only reference to the Tach cable in the manual, not CM400 specific.

    Stock Tachometers, How to add one-capture.jpg

    Is this the screw you are referring to that is holding the cable in the crankcase?

    Stock Tachometers, How to add one-capture2.jpg

  9. #28
    Senior Member dtsmjr8dan's Avatar
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    The 78/79 CB/CM 400 covers have the hole for the kickstarter, from 80 to 86 don't . That is the only difference.
    1979 CM400T (rider),
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (parts bike)
    1982 CB450 (parts bike)
    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.
    Remember, today is the tomorrow we worried about yesterday.
    My chest fell, but, fortunately, my belt caught it.
    I don't know everything, nor, have I met the one who does.

    T-shirt sales supporting 66Sprint's LSR Build http://www.hondatwins.net/forums/22-...d-attempt.html

  10. #29
    Super Moderator longdistancerider's Avatar
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    The Honda FSM is the best there is and yes it does lack some things. The tach drive never seems to fail and only once in awhile the seal leaks.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

  11. #30
    Junior Member xxbradxx's Avatar
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    Thank you both very much. I ordered the oil seal from the dealer for $4. Will be there tomorrow. I'll inspect the tach drive when I get it all apart after the new tach cable arrives Thursday. It's $28 and can be here in 3 days from the Midwest. Not too bad.

    I'm posting a Free tach on the parts forum page if anyone can/wants to repair this one. All parts are there, just needs to be taken apart and put back together. Stock Tachometers, How to add one-image.jpg
    ---------------------------------
    I love bikes so much, I joined this forum for the 1980 CM400T I bought for my girlfriend. Ha!

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