Quote:
Originally Posted by katflap
Ok so temptation got the better of me - out it came 
Switched on, pump up to pressure - no leakage
cranked on starter - injector sprayed
stopped cranking engine - no leakage
so that's me stumped for now 
Anyhoo , here's a few injector pics 
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It may be a long shot, but there aren't many other ways I can imagine the engine filling with gasoline; either the injector is intermittently sticking/leaking after shut down, or sticking and seeping after shutdown once it's warmed up, (same thing really). I've had carbs with sticking floats overfill and fill the crankcase but I've never seen an injected model do it. The injector is the only gas link to the engine so.....I'd change that first as you planned. Having gas in the oil isn't just bad for the bearings, it doesn't help the clutch either.