I found this old (1985) Yamaha 4hp outboard under my dad's back porch. He used it for about 10 hours and then just stuffed it in the shed. I changed the fuel and plug and put it in a barrel of water and it started on the 3rd pull. It was running well until I noticed some water coming out from under the engine cover at the rear. I took the cover off and discovered this giant hole on the side of the block (see attached picture).
It's actually the outside of the water jacket that surrounds the cylinder. I cleaned out tons of sand and silt and attempted a repair with J-B Weld and it worked for about 20 minutes and then water started to weep through.
Any idea's or is it total junk? Can aluminum be welded on this type of application?
Thanks guys,
Max
