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The Old Bang-The-Ball Trick
Sometimes, one or both ball check valves in the oil pump on the Triumph
twins stop(s) shutting off the oil flow in one direction, thus making
the pump fail to operate properly. This can cause a lack of oil
pressure, if it's in the oil feed side, or a lack of return, if it's
in the scavenge side. Bad seating in the scavenge can also allow
"leak-down" - oil can leak from the tank backward through the scavenge
pump into the crankcase, causing wet-sumping: lots of blue smoke when
you start the bike after it's been sitting awhile, until the pump
can catch up with the load.
What to do?
Here's how, with picture:
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