Laura 48 differences

I've got a pair of Batavus TT bikes with 25 and 30 MPH Laura 48's. Beside the carb and the exhaust size differences, what else is different? Can the 25 convert to a 30?

Re: Laura 48 differences

Don Pflueger /

carb, intake, cylinder port sizes, port timing, all play a part in determining what speed version m48 you have. yes it can be changed from 25 to 30.

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