My 650L engine is in great shape at 3700 miles, but I am itching to start some mods (other than simple uncorking and bolt ons). It seems to me the most obvious way to increase power on the "L" would be to boost compression. 1. Is it possible to just use a thinner head gasket and/or base gasket? 2. Is there a difference in the gaskets 650L vs. 650R? 3. How much can the comp. be increased without needing race fuel? 4. Is an oil cooler required? 5. I would expect a decrease in high rpm power...but how much? 6. If a simple gasket switch won't work, I will probably mill the head. Will I need to re-machine the squish band? Any and all input is appreciated!