From the Australian official Suzuki LS650 manual.
Fuel Octane Rating https://en.wikipedia.org/wiki/Octane_ratingUse unleaded gasoline with an octane rating of 91 or higher (Research method RON) [this is the method used in Australia]
If pinking or knocking occurs try higher octane or different brand.
Canada The US also uses this method known as MON
You m/c requires regular unleaded with a minimum pump octane rating of 87 [(R+M)/2 method MON] In some areas only oxygenated fuels are available.
Oxygenated fuel recommendationsOxygenated fuels which meet the minimum octane requirement and the requirements described below may be used in your m/c without jeopardising the New Vehicle Limited Warranty
NOTE: Oxygenated fuels are fuels which contain oxygen carrying additives such as MTBE (methyl tertiary butyl ether) or alcohol.Gas containing MTBEUnleaded gasoline containing MTBE may be used in your m/c if the MTBE content is not greater than 15%. This oxygenated fuel does not contain alcohol.
Gasoline/Ethanol BlendsBlends of unleaded gas and ethanol (grain alcohol) also known as GASOHOL may be used in your m/sickle if the ethanol content is not greater than 10%
Gasoline/Methanol BlendsFuels containing 5% or less methanol (wood alcohol) may be suitable for use if they contain co-solvents and corrosion inhibitors.
DO NOT USE fuels containing more than 5% methanol
under any circumstances, fuel system damage and/or performance problems are likely and will not be covered under their limited warranty.
To minimise pollution Suzuki recommend you use oxygenated fuels (ed: yeah right)
Be sure any oxygenated fuel has the recommended octane rating
If you are not satisfied with the drivability of you m/c when you are using an oxygenated fuel or if engine pinging occurs try another brand as there are differences between brands.