fr5-300 oil vs fr7-420
I have a couple of FR5-300s, running fine at specified oil level (18%). Now I read that the FR7-420 specifies a max of 10% oil. I have replaced all bearings in one of my FR5s, and again based on reviews, they dont seem have any significant bearing differences with the FR7 - ie ball races on crank and cam idler, needles on the big end and cams. This makes me wonder why the FR7 needs so much less oil than the FR5. LESS OIL = MORE METHANOL = MORE POWER to my way of thinking.
Can you shed any light on this please?