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Oddjob motors has a site that talks about the Lauson motors. Not much info but some. The crankcase on the 600’s take about 20-22 ounces of 30 weght non detergent oil. Be careful taking the carb apart on the 600 as the main jet runs diagonally through carb and can get bent. Best to remove this before removing the float bowl. Gaskets you may have to make yourself. Seals can be bought at a local bearing supply house. There was a site on the net that said you can interchange the gears and prop shaft with the Martin 60 outboard. Same with the recoil spring. I haven’t tried any of this. I have been looking for a source to find some head gaskets. I believe a member had some advertised recently. Simple motors, I hope you have a lot of fun with them.