Microlighters

Good day the Rotax guru’s
Please tell me the difference (and pros and cons) between a 582 Silver top and Blue top

Although not entirely true across all silver tops, but the blue tops crank assembly is different to that of the silver top. To be more precise - all 582s after serial 4172655, which is pretty close to where the change between the blue and silver took place, all have a crankpin of 26 mm diameter. This I understand was a bigger crankpin to the earlier silver tops. The newer crankshaft assembly could be retrofitted to the older motors.

Now why they changed the diameter and issued a service bulletin with the change, I have only one uneducated guess.

I would guess that .... There was an oopsie!