I recently purchased a Vespa VBB2 as a basket case. The previous owner ground the crankshaft counter weights and attempted to port the intake area. When I went to install the new correct factory style crankshaft the counter weights hit the built up area for the rotary valve and will not turn let alone provide the correct clearance. I am looking for a new or used case resource or a Vespa service shop that can build-up and machine the rotary valve area and to the correct clearance.