[/quote]The only issue I see with boring the carb is changing fuel delivery. The low pressure signal would be weaker if the venturi was enlarged......I think it may cause the engine to go leaner rather than adding more fuel.
I think they are getting plenty of air flow through the strato ports so why would the carb need to be bored?
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The only intended purpose of the strato venturi is to charge the transfers so that volume is tiny compared to the case volume. The rest of the system is standard. The strato air is thrown out the exhaust making the same principals apply, better flow, better performance
I have not seen a saw run outside of its auto tune ability yet, less an air leak. Heck even then Terry Landroms ran for 20 some odd tanks before I convinced him the base was leaking like a siv.
Many ways to skin a cat though