Regardless of the info I've given long ago I totally agree with you. Any manufacturer worth his salt (like Rossi for instance) knows far more than any of us as to what's needed for high performance and has the equipment to make it. Other manufacturer's of lesser quality engines would also likely know the tricks used by Rossi etc. but most would be too time consuming or expensive for mass production. For those who like to fiddle then it's necessary to know some of the finer details about what they want to try and what affect it could have. I've read some fantastic claims in this forum for mods that are totally dreadful and will absolutely ruin an engine so it's wise for anyone thinking about doing mods to have a good understanding first as to how they work.