Hello Mc Tool, thanks for the reply-I thought the SS series used a swinging arm pivot mounted on needle rollers with a smaller diameter pivot pin than the F1? Unfortunately, it's difficult to pin (hoho) down what system was used from Ian Falloon's book on the 2V twins. Any information would be welco...

Hello All! I'm trying to fit Paso crankcases to an F1 engine and was wondering about the swinging arm bearings. On the F1 they're large plain bearings and on the Paso, there seems to be an alloy 'plug' in the same casing with a bored out opening for a much smaller pivot pin. How easy is it to remove...