Hi Slice,
Thanks for the reply to my rather badly worded question. I did it on my smart phone and it's a bit of a challenge, but ticking off excepted and I apologise for my rudeness and not following the site protocol.
I am not a petrol expert but my brother told me that the the 97 Octane stuff makes his 70's SR500 run better. As my bike is the updated version of that Engine but with four valves and it appears a rubbishy fuel injection system. I thought I would ask the experts (other owners) for a second opinion, or save wasting money, as it is 7p a litre dearer.
I am having problems with rough running in first gear at low speed when stop start riding and the occasional engine stall when dropping from 3rd gear to second gear, which tends to happen when slowing suddenly from higher gears.The clutch was my suspicion but I got a mechanic to check it but it made no difference. both these things were mentioned by MCN on a test. But with no resolution mentioned. Therefore the petrol was a cheaper option if it helped the rough running but the other one is more of a concern. I did some online digging about it, and seems i am not alone with these issues on this model/age XT660. As you were the only person that replied I will have to live with it I think. Or sell the bike for a sensible one.
Thanks for taking the time to reply :0)