Oil Pressure Line
There's an oil line that carries pressurized oil to the cylinder heads
which is prone to breakage. This line sits inside the cylinder Vee and
looks like a letter Y. The middle is connected to the top of the engine,
the two ends carry the oil into the cylinder heads. The OEM part is
made of pressure tubing covered with a sort of textile armation. On older
bikes, but in some cases even within the first couple of thousands of
kilometers, the end fittings may come loose.
The best prevention is to replace the line with an aftermarket part made of
stainless steel brakeline tubing. These are available from
Stein-Dinse and others for
little money. A cheap part that can save you expensive trouble on the road!
Oil pressure Sensor
These cheap little things sit on the top left part of the engine block
near the left hand cylinder. They are of crappy quality and seldomly
last longer than maybe 10,000 km. Sometimes they go bad after a good
ride through the rain. I have not been able to find a part of good
quality to replace them, so I just throw them out every second time
I adjust the valves and put in a new one. At less than $3, it's not
too bad a loss, and I'd really like to know if the oil pressure drops with
some confidence. You'll know the switch is dead when the oil light
doesn't come on after switching on the ignition.