Clutch slipping
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Thread: Clutch slipping

  1. #1
    Junior Member BooTheRoo's Avatar
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    Clutch slipping

    Hi, I have a 1969 Honda CB175 with a clutch that slips at speeds over 45mph. Last summer I put new clutch springs in it. It still slips, just not quite as bad as it did before. So, I took it all apart again and now I am planning to replace the clutch plates and the friction plates. Has anyone had this problem before? I have no idea if replacing the plates will help...they appear to be in good condition. Thanks

  2. #2
    Junior Member Six7390GT's Avatar
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    Hi Boo,
    A few years ago, my 1983 Honda V65 Magna's clutch was slipping. I replaced the spring and the steel and friction plates that also looked good. No more slipping. The difference was amazing.
    Good luck
    Last edited by Six7390GT; 08-10-2019 at 06:00 PM.
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  3. #3
    Sensei 66Sprint's Avatar
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    Did you try adjusting it first?

    What brand and spec oil is in the engine? (Is the oil rated with a JASO-MA spec ?)
    Last edited by 66Sprint; 08-10-2019 at 06:02 PM.
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  5. #4
    Junior Member BooTheRoo's Avatar
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    Yes, we adjusted it according to the instructions the first time that we took it apart and put it back together, when we put the new springs in it. I think we just used the type of oil that the owner's manual specified...is there a kind of oil that you would recommend? What does JASO-MA mean? I called my friend but he didn't answer...he was with me when the oil was changed, and may remember what the type of oil was.
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  6. #5
    Junior Member BooTheRoo's Avatar
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    Thank you!

  7. #6
    Senior Member 76TWIN's Avatar
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    You cannot just use regular rmotor oil in these bikes since they have wet clutches. The oil must be JASO-MA rated.
    Modern motor oil contains friction modifiers that will cause the clutch to slip.
    Many here (myself included) use Rotella T4 oil since it's cheap and readily available.
    '76 CB500T Frankenbike
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  8. #7
    Senior Member 80cb400t's Avatar
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    JASO MA is a certification and they print all of them on the back of the oil jug, that's where you can find whether the oil you are looking at will work with your clutch. No JASO MA = keep looking.
    1980 CB400T - 1 running, 1 parts bike
    1965 CB160 - 1 kind of running, 1 parts bike

  9. #8
    Junior Member ThomBoz's Avatar
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    I'm BooTheRoo's friend, Thomboz. I'm an old guy, quite experienced with motorcycles. So here is the low down. Boo bought the bike from a guy who said he rebuilt it. The clutch slipped when Boo 1st got it at about 40mph. We changed the oil with MC specific oil (wet clutch). We then adjusted the clutch... several times. Stock springs are no longer available, so I called Barnett. They do not have a listing for CB175s. Boo sent them the springs we have, they sent them back along with 4 more that are longer and stronger (at no charge, we love Barnett!). Now it goes maybe 45 before slipping.
    Do any of you know where we can buy the correct springs? I know people vintage race these buggers, so there must be info and parts. The plates appear to be in good condition, plenty of friction stuff left. If the previous owner put some super slippery synthetic car oil in it, could that be the cause? Next try is to clean up the plates, then try new ones.
    One more thing, previous owner overtightened cheap allen case bolts. (We got then out eventually using a #27 star bit with impact driver on the worst one.) Any source for clutch cover bolts? Thanks!
    One more thing, BooTheRoo just past the CHP endorsed Motorcycle Training Course by Total Control... congratulations are in order.

  10. #9
    Senior Member FrisianWheel's Avatar
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    CMSNL.com has clutch springs for the 69 CB175.


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  11. #10
    Senior Member ancientdad's Avatar
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    Just put new friction plates in it and be done with it. The amount of wear on friction plates that can cause a combined loss of total thickness is small enough that a visual inspection often misleads... the steel plates are usually fine unless they're blued from high heat or obviously worn. New springs with old friction plates isn't usually enough to stop slippage

    And yes - congrats to Boo. Time to get the bike rideable and start enjoying it while the summer is still here
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