pbekkerh wrote:Is the engine standard or what has been done ?

I'm trying to persuade my son to get some bigger cylinders for his 350YPVS

Engine will remain standard (apart from pipes and a set of PWK28's) whilst shaking it down.

Plans are for one of the Banshee big bore kits, initially 420cc, as that is the biggest you can go with the standard crank. After that, who knows ?