Need advice with regular maintaince

[Volvi]

I once tried changing front sprocket myself, no can. that nut only loosened with an air hammer drill/wrench. so let the workshop do it, nor would I attempt installing new chain with rivet thingymajig that I dont have. I do alot of work on my bike but somethings I just leave it to the workshop.

Hi Octane? Ive run my bike on 98 Ultimate for years now not only no probs but best ever, so cant imaging its the hi oct. but hey if its always run well on standard, go back to it and if still persists you know its not the fuel.