It's definatly a 657x It says it right on the engine spec plate. Also states it on the origination certificate from Bombardier. Model 5892 31.1 hp at the pump.
I've been riding and building JS 650 sx's for years and years, this is my first Rotax.
The boat is so clean I couldn't pass it up. They put $1100 into the pump alone in late 04'.
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