SOHC.co.uk Forums > CB750

Oil, oil pumps and primary chains

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SteveD CB500K0:

--- Quote from: Graeme77 on June 24, 2011, 05:49:15 PM ---
I did google about car oil but didnt find much, ill look again.


--- End quote ---

This is a good one:
http://www.realclassic.co.uk/techfiles/oil030319.html

K2-K6:
I've always run these 750 motors on the original Castrol GTX 20/50 car oil, this is from and in the 80s and never had any problems at all. None. This experience pre-dates any current discussion (pre-dates any of these forum!!) so I've not taken into account any current discussion.

I looked after a K6 in that era for a friend and this took an unimaginable thrashing that would truly make you wince but it never ever suffered any lubrication problems running on that oil never smoked, broke or stopped.

It's slightly odd after oil change as when you've put all the plugs/filter back on ten filled the tank with oil, as you start it the tank level will usually go down very quickly as the system refills via the oil pump so makes sure you have enough in the tank to avoid sucking air.

You can take the plugs out and spin it over with no compression at first if you want to be kind to it.

It's my opinion that mainly oil contamination by petrol has caused many petrol motors to wear prematurely over the years and have use of choke is a disaster to the general health. It's only to make it rich enough to fire and should be backed off ASAP and use higher tick-over to keep it running as this has no detrimental effect. I always smell the oil over any engines I'm asked to check as to me any smell of petrol means it's defective for it's principle purpose of lubrication.

Graeme77:
The link above seems to suggest car oil is fine.

It also says use multi grade,and that mono grades in old times were recomended because 'that was the bets available'.

Then, in another part of the site is says to stick with different single weight vicocities in different seasons.

Both in relation to nortons, but polar opposite conflicting opinions on the same site ???

All i want is to be able to go and buy it localy tomorrow morning and for the clutch not to slip LOL.

Looks like ill probably use halfords own semi synthetic 10/40, hein gerickes version of the same (i need to go get some grips anyway), or maybe this tesco diesel oil. Been searching the net for info but cant find any.
Can you tell us all a bit more?

the-chauffeur:
If you decide you want to start digging around inside the engine (and save yourself a few quid), you could do worse than the primary chain tensioner mod about halfway down this thread.  I doubt you'll be able to do it without splitting the cases.

I did it when I put new chains in mine, and the engine now seems quieter than before, but then I also changed all of the bearings in the engine, so I'd bloody well hope it was quiet . . .  

As for oil, the shop manual for the 750K series said 10w40 should be used in the forks - that should tell you all you need to know.  Just bear in mind that when these engines were made, oil was oil - it didn't come cut with detergents and all sorts of additives - and those that were looked after have lasted pretty well.

Graeme77:
Ok, a shim to make the tensioner apply more pressure.

Sounds ok, but must increase wear rates.

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