Slightly off subject, but not....

91 Octane gas is way to low, surely that would cause detonation and eventually a terminal engine illness...?

My bike is not standard but also not greatly modified and I was getting mild detonation from 95 Octane and now only use 98 Octane.

So, although I haven't solved your problem I hope I can prevent a possible future one.

If I'm wrong let the slaughter commence.....
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Stop sniffing my ring

MC28SP
KLX110 hotrod
CAG Minimoto
1997 WRX
21 Speed Bike
162 Smurfs