[jleuck64]

84 JS550
Recently had a front crankshaft bearing failure. There is also damage to the front piston and cylinder as a result. When the bearing let go it looks and feels like it left some scoring in the crankcase. I am wondering if I should attempt to re-use the case and rebuild this engine or try and find another case to use with my engine (what years would work?) or perhaps I should just plan to order a rebuilt engine? Thanks for any opinions...

 

[550ty]

I had same thing happen. I went the route of buying parts and having bored. If I could do again I would just buy reman engine from SBT.com. They are $750 + core. I’ll list what I have bought so far for mine.
New crank $350 + core (SBT)
Wiesco 76mm pistons $225
Upper and lower seal kit $60 (SBT has thicker gaskets
Bore and set ring gaps $200

I also have the issue of my cylinder (jugs) don’t have a “true top” so I have to have machined true (If possible).
The third route would be to find a running Reed engine but those are hard to find.
If it were me I’d pony up and buy SBT engine save $$$ and heart ache in the end.