Re: '93 CBR F2 Struggling to Run
I see where you're going with this, SO:
The way that I did the oil change was drain, replace filter, pour new oil in measuring 3.7 L as indicated by the manual. I measured it by putting the bike up on its center then checking its dipstick. It looked to be topped off last I checked.
In terms of using a FRAM filter, I was considering using a Mobil 1 filter, but decided to go with what was installed since before I purchased it (since this has happened I'm thoroughly considering running a Mobil 1 or K&N for my next oil change.
In terms of synthetic vs conventional, I did go conventional with proper API rating as listed in the Haynes manual. I know I've heard from multiple sources online and in person about how if a motor has gone synthetic, it shouldn't go back to conventional just to be safe. Now, to the degree of truth that statement has, I don't know, but for now I'll be using full synthetic because I did a quick oil change and boom. No more problems.
So in short, I changed the oil to a 20W-50 fully synthetic oil and my bike loved it. There was no more rattling, no more struggling, and a perfect idle at 1.5k where it was before it started having all these issues. I took it on the road and shifted it through the gears and through the (legal) rev range, about 7-8k since I didn't want to get too far should I break down again. There were no more issues and listening to the footage I filmed of before and after, it was DEFINITELY noticeable how much better the engine is.