Oil level warning light

[1967fazer]

Will check and make sure the level is bang on the mark, pretty sure it is tho. It used to come on briefly every now and then, which is how I became aware of this issue, but now it comes on lots, usually when the bike is just cruising and if its been ridden enthusiastically its not a problem. I check my oil everytime I go out on the bike so a lack of oil isn't a worry, its more annoying than anything else!