Author Topic: Oil feed to clutch cb750k  (Read 2909 times)

Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #30 on: November 24, 2023, 05:45:24 PM »
I have already fitted a new oil ring and left hand bearings plate I was going to try spinning bike over with the bung out (kill switch off) to see if oil comes out where bung goes then put bung in and see if it get to bearing if it does I will fit gear change and cover and try running the bike and see if it gets to clutch
Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2

Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #31 on: November 28, 2023, 10:56:02 AM »
Update I have oil getting to clutch also pic of bang just waiting for gasket hopefully it made a difference in gear change
Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2

Offline Martin6

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Re: Oil feed to clutch cb750k
« Reply #32 on: November 28, 2023, 10:58:02 AM »
Well done. What was the cause of the problem?

Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #33 on: November 28, 2023, 11:04:13 AM »
I don’t know I just wish I found something just cleaned out galleries with bottle brushes but until I get clutch cover gasket I won’t know finally if it’s sorted it
Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
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Re: Oil feed to clutch cb750k
« Reply #34 on: November 28, 2023, 11:37:11 AM »
Fingers crossed, let us know how you get on.
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Offline Martin6

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Re: Oil feed to clutch cb750k
« Reply #35 on: November 28, 2023, 01:21:36 PM »
I don’t know I just wish I found something just cleaned out galleries with bottle brushes but until I get clutch cover gasket I won’t know finally if it’s sorted it

Fingers crossed. That's been my experience with carbs!

Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #36 on: December 04, 2023, 11:10:14 AM »
Update all back together still clunky between gears goes into neutral okay I found a note in the Honda manual about viscosity of the oil given drag on the clutch so now going to try some Castrol GTX 10w40 classic for classic bikes, and cars also going to check the oil pump strainer in sump. Would it be a good idea to change the O-rings where the pump meets The engine
Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2

Offline Martin6

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Re: Oil feed to clutch cb750k
« Reply #37 on: December 04, 2023, 02:59:59 PM »
Needs to be an MA2 spec oil.

Offline Johnny4428

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Re: Oil feed to clutch cb750k
« Reply #38 on: December 04, 2023, 05:10:48 PM »
Ahh! Castrol GTX was there any other oil in the 70’s? 😂😂
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Running resto,
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3

Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #39 on: December 04, 2023, 05:19:13 PM »
Castrol GTX 10w40 mineral That the oil I used in the 70s and 80s on all my bikes
« Last Edit: December 04, 2023, 05:34:06 PM by Pauarc »
Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2

Offline Pauarc

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Re: Oil feed to clutch cb750k
« Reply #40 on: December 05, 2023, 09:50:34 AM »
I just emailed Castrol about ma spec oil and they replied I don’t know if the info is any help
Honda 90ss, Cb250k1 supper sport,
Cb400 four, CB750k7, Cb550, Cb750f2n,
Cb750k2

Offline Johnny4428

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Re: Oil feed to clutch cb750k
« Reply #41 on: December 05, 2023, 08:24:59 PM »
Interesting stuff there Paul.
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1. Running resto,
1978 Honda CB550K3.
1999 ST1100 Pan European 50th Anniversary.
1975,1980,1984,1986 Honda C90’s
1973 Honda CB750K3

Offline K2-K6

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Re: Oil feed to clutch cb750k
« Reply #42 on: December 06, 2023, 12:28:02 PM »
Interesting information in there pauarc.

Jaso Ma2 would appear to (going by convention) have a reduction zinc element to reduce the affect on post combustion exhaust gas treatment equipment, not helpful in these engines we talk about.

The point about Jaso labelled oils, is not the absolute std and the oils that are classified as such, but that perfectly good oils we could use are never going to be subjected to testing for that std as it's not necessarily their target market.

The point is made though, that this oil is a match for that previously used in these engines when contemporary. Making it realistic to use it currently without any particular concern.

Offline Skoti

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Re: Oil feed to clutch cb750k
« Reply #43 on: December 06, 2023, 04:17:03 PM »
Was horrified to discover the PO had cut grooves round the friction surface of the steel clutch pressure plates of my CB750F1.
But as the clutch had been previously working OK I just re-assembled it as is.

Seemed like a severe botch to me, and probably done to help prevent clutch drag perhaps?


Anyhow I'm not advocating this as a cure for clutch drag.
Be good to find out what the proper cure is tho...

 

 
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1976 Honda CB750F1

Offline Oddjob

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Re: Oil feed to clutch cb750k
« Reply #44 on: December 06, 2023, 04:26:37 PM »
There is this mod to the 750 clutch, done in order to get more oil onto the friction plates etc in order to make the action smoother and thus gearchanges.

http://forums.sohc4.net/index.php/topic,7190.0.html

I've done this mod to a CB1300 and whilst the difference wasn't pronounced it was a bad change before but as they say "Every little helps"
Kids in a the back seat cause accidents.
Accidents in the back seat cause kids.

 

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