Bore out A65 to 85

[P McD]

Hi All,
Does anyone have any experience of changing a Continental A65 top end to an 85 cc or 75. Can it be done by reboring the cylinders and buying new cylinders. Will I need a new prop? I have a Hercules at the moment. Any advice will be great.

Regards
Paul

 

[AKJurnee]

 

[cwbjr]