What is this gizmo? 76 750 F1

[jimshea]

I have checked the Haynes and have decided this manual is only for people who already know everything about these bikes!
Anyway, behind cylinder 3 on the top of the engine case(directly under the carb boot for 3) there is a stiff plastic tube that has a threaded end going in to the engine case.
What is this for?
My one is not screwed in all the way, there is a gap of maybe 1/4-1/2\" and there is a small amount of oil leaking from there.
Should this be screwed in all the way? or is there supposed to be a gap
Cheers,
Jim.

[jimshea]

I have found out that this is the oil pressusre sensor. But should it be seated all the way down, or should there be a gap?

[JonnyB]

I had a look on the engine casing I have spare and it looks as though it threads in as far as it can, there isn't a seal. and as you can see from the rust line in the photo, don't screw all the way down

[jimshea]

Chees'
The concensus is do not screw in all the way, apparently soem teflon tape aorund the other thread stops any leaks?