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Author Topic: Oil feed to clutch cb750k  (Read 31275 times)

Offline Pauarc

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Oil feed to clutch cb750k
« on: November 19, 2023, 08:39:54 AM »
Just run bike with the clutch cover off I don’t think it’s getting any oil to clutch the clutch is quite dry is there anyway I could check the oil feed pump seems to return oil to tank ok
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Honda 90ss, Cb250k1 supper sport,
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Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #1 on: November 20, 2023, 11:35:14 AM »
Just fitted a test oil gauge and idle pressure seems to be about 35psi  and at about 3000 to 4000 it is about 60psi this is with the engine hot just can’t understand why clutch drags so much (help me)
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Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #2 on: November 20, 2023, 02:11:28 PM »
Does anyone know what the hole in clutch centre is for
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Offline McCabe-Thiele (Ted)

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Re: Oil feed to clutch cb750k
« Reply #3 on: November 20, 2023, 04:08:53 PM »
« Last Edit: November 20, 2023, 04:30:41 PM by McCabe-Thiele (Ted) »
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Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #4 on: November 20, 2023, 05:41:02 PM »
Took clutch apart again no oil in central hole bike is a cb750k2
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Offline Oddjob

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Re: Oil feed to clutch cb750k
« Reply #5 on: November 20, 2023, 05:42:01 PM »
Second link looks like it could be the solution Ted. First link isn't very informative.

There is a mod to increase the oil flow to the clutch plates but if there's no oil in the first place it's kinda redundant.
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Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #6 on: November 20, 2023, 06:08:56 PM »
I have changed the oil seal under bearings plate not sure if this is the plug
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Offline Nurse Julie

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Re: Oil feed to clutch cb750k
« Reply #7 on: November 20, 2023, 06:21:22 PM »
It almost sounds like you have a blockage in the oilway to the clutch 🤔🤔.
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Offline Nurse Julie

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Re: Oil feed to clutch cb750k
« Reply #8 on: November 20, 2023, 06:33:12 PM »
Quote from: Pauarc on November 20, 2023, 06:08:56 PM
I have changed the oil seal under bearings plate not sure if this is the plug
No, that's a bolt hole, I've circled the plug in red. But some of them didn't have the rubber bung, the gasket covered the oilway. Your bung looks like it's got a hole in it for some reason 🤔🤔🤔🤔
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« Last Edit: November 20, 2023, 06:34:48 PM by Nurse Julie »
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Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #9 on: November 20, 2023, 07:13:50 PM »
The plug may be worth a look if the plug is removed I could see if oil is there if I spin on starter motor
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Honda 90ss, Cb250k1 supper sport,
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Offline Nurse Julie

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Re: Oil feed to clutch cb750k
« Reply #10 on: November 20, 2023, 07:23:45 PM »
Quote from: Pauarc on November 20, 2023, 07:13:50 PM
The plug may be worth a look if the plug is removed I could see if oil is there if I spin on starter motor
Yes, if you're not getting any oil out of that chanel, that could suggest a blockage somewhere.
« Last Edit: November 20, 2023, 07:25:52 PM by Nurse Julie »
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LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #11 on: November 20, 2023, 07:34:21 PM »
There is a good return to oil tank so hopefully may be that?? Keep fingers crossed 🤞
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Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2

Offline Nurse Julie

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Re: Oil feed to clutch cb750k
« Reply #12 on: November 20, 2023, 07:48:41 PM »
Quote from: Pauarc on November 20, 2023, 07:34:21 PM
There is a good return to oil tank so hopefully may be that?? Keep fingers crossed 🤞
Yes, fingers crossed, if you've got enough pressure for the oil to return to the tank, you should get oil out of that hole once the bung is removed. When you've removed the bung, take a photo of it so I can see if its a proper bung or something that someone has made at home.
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LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Oddjob

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Re: Oil feed to clutch cb750k
« Reply #13 on: November 20, 2023, 08:30:32 PM »
Looks like sealant not a bung to me
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Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #14 on: November 21, 2023, 07:44:41 AM »
Hopefully l have time at weekend to look at it I will keep you updated thanks for help
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Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2
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