Author Topic: Oil change and clutch check  (Read 729 times)

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Offline bomorr

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Oil change and clutch check
« on: November 12, 2016, 01:00:31 PM »
Just did an oil and filter change on my 76 CB750 while I was doing that I decided to check my clutch disks to see how worn they were. clutch disks were within tolerance and disks weren't warped at all. So I deglazed the plates with some 220 and cleaned it all up. reinstalled and put new oil in (which by the way scared me because after I put 3 qts in the resevoir was completely full)
The oil was a 20-50 Castrol synthetic.
I used the kick starter to Cycle the oil through the motor about 3 complete compression cycles. started it up and took it for a quick ride and I noticed that it was more difficult to shift through the gears than normal but easier to find neutral now. I checked my clutch cable adjustment and everything seems to be correct. Is this normal right away after an oil change?

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Offline BomberMann650

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Re: Oil change and clutch check
« Reply #1 on: November 12, 2016, 02:13:44 PM »
The type of oil does matter.  But it is best we not have this discussion  ;D

Offline bomorr

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Re: Oil change and clutch check
« Reply #2 on: November 12, 2016, 02:23:17 PM »
The type of oil does matter.  But it is best we not have this discussion  ;D
yea I was really trying to avoid that
 I have been doing some research and found an old post by hondaman specifically saying not to use the v twin oil, which is what just used.... so I'll be doing a quick oil change when I get some spectro synthetic. That has to be the main issue here.
This is the first old CB750 I've owned so I'm still getting used to all the quirks of the ol' girl.

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Offline ekpent

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Re: Oil change and clutch check
« Reply #3 on: November 12, 2016, 03:02:04 PM »
 Re check your oil now that it has circulated through the engine. Best time to do it is shortly after running. Should take a little more then 3 qts to the full line.

Offline bomorr

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Re: Oil change and clutch check
« Reply #4 on: November 12, 2016, 03:17:39 PM »
volume of oil did go down after the quick ride just below full, it should be about 3.5- 3.7 qts right?

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Offline Handlebar

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Re: Oil change and clutch check
« Reply #5 on: November 12, 2016, 03:30:26 PM »
I just did a end of season oil change on my 78 750F. Total oil replaced was about 3.5 to 3.7 quarts, I have been using Valvoline 10 w40 for 4 stroke motorcycles. Seems to be working good.

Offline BomberMann650

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Re: Oil change and clutch check
« Reply #6 on: November 12, 2016, 04:24:18 PM »
The zinc content of valvoline and castrol ** is notably less than Honda's offering.  Thats what keeps me going back to the dealership for oils.


**conventional - haven't seen specs for synthe

Offline PeWe

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Re: Oil change and clutch check
« Reply #7 on: November 13, 2016, 10:56:08 AM »
There are several threads about good oil, oil additives with ZDDP etc etc.
Red Line motor cycle oil has plenty of zinc, no more needed. That oil is not cheap but additives cost too.

Sure the clutch is working properly, clutch mechansim properly adjusted and cable is routed correctly?
Operate clutch is easy as before, shift gear feels different?

Last oil I used was a very cheap semi-synthetic motorcycle oil for cleaning engine after work. Clutch and shift gear worked Ok, but not as with the mentioned Red Line oil.

I'll use that cheap oil as burn in oil for the first 300km.
« Last Edit: November 13, 2016, 10:59:44 AM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967