I think gearhead could be onto something, i dropped/strained oil there is a little crud in it, so i stuck a bit of wire through the sump plug and there's a fare bit of crud in there. i'm in the middle of flushing it out with fuel, through the dipstick as to not wash the whole engine dry of oil. So i'll know in a couple of days if this doesn't work, it looks like the sump is coming off. Thanks guy's i'll let you know how i go.