We would need more info than what you have provided to tell you what you have.
Post a picture, include the serial# and it shouldn't be too hard to tell you.
Check to see if the stock oil injection pump and oil tank are still there or if an oil injection block off has been installed. This will determine if you have to mix 2-stroke oil with your fuel or not.
If no modifications have been made to the motor then an 89 or 91 octane should do fine.
Hope this helps.
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"Riding an '89' is a Splash from the past
PJS Exhaust & Waterbox
Mariner Head - Decked at 185lbs compression
38mm Keihin
Ported & Flow Matched Stock Intake
R&D Reeds, Cages & Stuffers
Skat 15
R&D Toploader Scoopgrate
Ocean Pro rideplate
Pump drilled for dual cooling
500gph rule
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