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MTH Big Boy

19K views 78 replies 18 participants last post by  du-bousquetaire  
I own a big boy and wouldn't hesitate to lube everything liberally - the engine's a tank and it's unlikely you'll damage anything. Just ensure that the fiddly bits (side rods, etc.) don't get dirty while they're still wet with oil. I love my engine, but it's currently down with a fried smoke unit.