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Thread: Cb450k6 Issues Please help

  1. #11
    Supporting Member jd50i's Avatar
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    Check alignment of the butterflies in the bores, you might just need to loosen them and realign them if they are dragging on the bore wall.
    Jim

    1973 CB 450 K6 PAMCO
    1975 CB 500T PAMCO
    1985 CB650SC Nighthawk
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    2012 Buddy 125 (wifes)

  2. #12
    Senior Member ancientdad's Avatar
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    Take a look at the clutch cable in the upper picture in post #7 - it looks like the inside throttle arm is hanging on the clutch cable, which is curved backward

    Cb450k6 Issues Please help-clutchcablethrottlesticking.jpg
    Saltychips likes this.
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  3. #13
    Senior Member tbpmusic's Avatar
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    Quote Originally Posted by ancientdad View Post
    Take a look at the clutch cable in the upper picture in post #7 - it looks like the inside throttle arm is hanging on the clutch cable, which is curved backward

    Click image for larger version. 

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    I was wondering how long it would take someone to notice that...........
    Bill Lane
    Honda Twins Founding Member

    No advice, just info

    '75 CB200T, '71 CB450 K4 Half-Breed, '72 CL350 (Sold), '81 CM200T, '72 C70M
    and a little red Chineeze scooter

    http://www.bikeexif.com/honda-cb450-restoration

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  5. #14
    Senior Member ancientdad's Avatar
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    So you were torturing everyone while knowing all along??

    It's a close juxtaposition the cable has with the left carb (Mikunis solve that problem, but certainly not worth doing on a stock bike just for that)
    Saltychips likes this.
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  6. #15
    Junior Member Saltychips's Avatar
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    False alarm, it was the cable. One is crimped while the other is straight. Going to order a new one today. Thanks guys! Also, I noticed the boot was cracked so I will get that as well.

  7. #16
    Junior Member Saltychips's Avatar
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    Will the detent mechanism be an easy fix or does that require a full teardown? What should I be looking for when I find the detent mech, loose, chipped, etc.. Just want to be prepared for when I do get to this part of the project.

    Are parts readily available and if so where is the best place to go?

    Right now I'm at 25,000K miles and am considering a full teardown if necessary.
    Last edited by Saltychips; 07-23-2019 at 03:00 PM.

  8. #17
    Senior Member ancientdad's Avatar
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    Yeah, the detent mechanism parts are pretty much unobtanium at this point. The prime suspects are the larger detent roller of the two (commonly referred to by some as a pizza cutter) and the star-shaped part on the end of the shift drum, which gets worn on the tips of the star causing sloppy location of the shift drum (which moves the shift forks to the exact spot for positioning the gears for the proper speed you select). It can all be accessed under the clutch inside the right crankcase cover without a full teardown, but my warning previously was in case you (or the PO) had ridden the bike long enough that the shift forks had already suffered wear or being bent by the trans kicking out of second. Sometimes you can buy the "pizza cutter" on eBay, but no point in doing so unless you find someone selling a NOS part

    Cb450k6 Issues Please help-450shift-drum.jpg
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  9. #18
    Senior Member 76TWIN's Avatar
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    No it will not be an easy fix per se. It's not particularly difficult but there is quite a bit of work involved as it requires you to open up the right crank case of the engine to get to it. Have a read.

    https://www.hondatwins.net/forums/55...ar-popout.html

    The hard part comes when you have to replace the parts as Tom mentioned above they are practically made of unobtainium.
    '76 CB500T Frankenbike
    '73 CL450 (basket case for now)


    Carpe narem.

  10. #19
    Senior Member 76TWIN's Avatar
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    '76 CB500T Frankenbike
    '73 CL450 (basket case for now)


    Carpe narem.

  11. #20
    Senior Member ancientdad's Avatar
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    Here's what my pizza cutter looked like when I got it apart

    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

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