Thanks for advice, is it possible that my engine has no oil fillter ? i haved searched for an internal one with no luck. the chap i bought the boat from informed me that he changed the oil often and there was no fillter to worry about.
The engine starts and runs well.
I will try and obtain info on betta engine to compare cheers.
There was no external oil filter on my Kubota 12 HP. It had a cleanable internal device that looked something like a variable capacitor, with two sets of hemispherical meshing plates that could be rotated from outside the engine. Oil passed through these, collecting any debris, which was then removed by rotating the plates.