Blue top versus Silver top

[Ou Man]

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

[skybound®]

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.

[bobthebuilder]

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