I don't give a toss about the money as it has a fun factor of orgasmic qualities that nothing else can replace in life.
I always run e5 in all my stuff (even the mower) but only Esso in my Nsr250 as I’m trying to avoid dissolving the centre crank seal.
Funny you mention that, my neighbour just had a centre seal made for his Honda 250 as part of his rebuild project, apparently you can obtain the outer but not the centre seal.
E5 or even E0 if its available, whatever is available otherwise. If its got ethanol in it of any strength, and I end up being parked up for any length of time rather than running it off - I use an ethanol stabiliser to stop any damage to plastics or to metal tanks on my other stuff.
Yeah the mc21/28 cranks are a pain it’s either a new crank (Honda has made them available again) or a company in Japan has come up with a centre seal for them . I think a company in Australia also sells a centre seal too. Either way not cheap.
Yes, used this since it became available about ten years ago. It stopped any damage on my older bikes too. It is the best on the market. Lots of imitators, only one 'the best' It's not hard to find in motorcycle shops and/or online