Help needed ,i have had a big fuel leakage problem didnt notice it for a week or two ( started running rough and stinking of petrol) so have taken carbs off and a friend is servicing them for me ,i have put new plugs in ,a new air filter cause the last one was ruined with fuel in airbox,,i have done a pet cock repair new diaphram ,washers etc.So while waiting for carbs i took oil filler cap off and it smells of petrol.
So i am going to do an oil/filter change ,should i flush ( if poss) the crankcase with something ( if so what ) before filling back up with new oil .
Any help would be great.