SOHC.co.uk Forums > CB750
‘750 Start gremlin.
K2-K6:
It's interesting to hear other views independent from my own Johnny, and build a bigger picture.
Its a remarkable oil, but there's of course no magic in these topic. Peter Williams wrote in depth about it's properties and limitations, which I found very interesting quite a few years ago.
My 2ml example is on a pumped fuel injection system, low pressure @ 40 psi but on a loop round to cycle it back to tank after pressure regulator, but with no observations to the detrimental in roughoy 5 years now. Gets a lovely waft of "R" when you boot it with the ecu going full bleed in acceleration pump facility to light up the response.
It doesn't seem to have a probem at that dosage though in carburettor that I've used. An old, 1980's Honda four stroke generator has been on that for 10 yrs or more, with running and starting impeccably even though it's not in action much recently. I never have to clean it for fuel problems, just run it out with fuel tap off, then open tap and it starts within about 3 pull usual from deep storage.
Oddjob:
Maybe we should all decant some caster oil into one of those measuring bottles, the one you squeeze and a very small bottle on the side of the cap fills up with a specified amount, that way you'd know to drop say 2 caps full into every tank filling. Average SOHC tank is around 3 gallons or say 13 litres, that's 13000cc if my mental maths is correct, so you'd need around 130cc of caster oil in that case, sounds a lot TBH.
My maths correct?
K2-K6:
Yes, correct Ken, 1 ml in 100 fuel.
10ml per litre as you note.
Obviously depends on usage profile, with many collected bikes not doing a great mileage, interspersed with sitting around.
Economics of significant daily mileage may be of different bias, keeping properties too with modern engine and high fuel turnover giving different view as to value etc.
No difference if you're running a blue-smoker ;D
taysidedragon:
--- Quote from: Lobo on August 10, 2023, 10:20:13 PM ---Cheers Gareth,
I’d argue though that 2 weeks is insufficient to pool any substantial amount of water, but more pertinent is the fact that on Normal (vs Reserve) you’re taking (good) fuel from a couple of inches up.
If a fortnight was enough to cause grief suppliers would have done something about it surely?
Appreciate the thought though.
--- End quote ---
True, 2 weeks isn't long. I was thinking about longer periods of a couple of months.
On the other hand, light aircraft with piston engines have to drain fuel samples from special fuel drains every day in the first pre-flight inspection. Transparent containers show separated water at the bottom.
McCabe-Thiele (Ted):
Is this the type of Castor Oil a 30 grade ?
.https://www.morrislubricantsonline.co.uk/race-c-30-castor-based-motorcycle-engine-lubricant.html
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