June 23, 2013
November 16, 2011
2-stroke engines flush themselves with every cycle 🙂
...& the Rootes Commer engine I worked on, even used to decoke itself!
Assume you mean the gearbox oil. The oil therein will not be black, as it has no combustion process to turn it thus. It may be old & discoloured and contaminated with metal filings and clutch friction material.
The black oil you refer to is usually a leak from the gearbox output seal...or on the opposing side, some oil can seep past the kickstart shaft and picks up a dirty grey colour from the steel kickstart shaft to alloy cover interaction.
I use a cheap multigrade 20/50 in mine, as do several on here, but others like a straight 40 grade. Arguments on this abound. My clutch plates prefer the former. I change it every year, keep an eye on the level and all is well.
September 22, 2019
January 18, 2020
More info required – has this just started happening, or have you not used it for a while so not sure, or have you changed something so something is different ... (?)
Mike H --
Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.
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