Why are my plugs all different colours?

[IBLOWN]

the 1 one the left is fine the 2 middle ones lean as and 4 is rich as ,look i didnt eat lead paint as a kid ,but dont use 98 in you bike it is crap! i was told this by a petrol rep after my last busa motor went bang ,and all i used was 98,and my plugs funnily enough looked just like yours except # 3 was dead

use 95 fuels ,do not use shell anything its garbage!

Ive heard this too. People reckon normal unleaded is the best. Ive always used 98 in all my cars and never had a problem. Maybe the bike is different?