[alantf]

Originally Posted by MLGTIB

I have had my GZ since September and when i first got it i put regular gas in it and it rode weird. I took it to the shop and they told me to use only premium in a bike.

Very strange! Doesn't the shop know anything about high compression engines versus low compression engines? The GZ is the latter, and as such is designed to run on the cheapest fuel. All the premium (& therefore more expensive) fuel does is to contain a retarder, which is needed on high compression engines, to stop premature ignition, due to the high compression. This is making no sense to me at all, so perhaps someone with much more expertise than me can jump in & explain why the premium fuel makes the bike run better.( Thought - "could there be a problem with the ignition timing of the bike?") :??: