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Hi Jimmy,
That's what I've learned, the 550 plus is basically a 5500c3 with bushings instead of bearings.
I just got a real nice 5500c3 from ebay, but I'm still gonna put ball bearings on the 550 plus's spool at least. i don't know how much improvement the crank bearing would be.
One thing for sure the ball bearing c3 out casts the plus with spool bushings.
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