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Originally Posted by Brian Donnell
I haven't ridden in 17 yrs, I've been disabled for the last 6 yrs and just started again with an '05 Vulcan 750. It says right on the bike to use Pemium Gas ONLY. I believe for the money you spend on them they can be more specific about the types of fuel and what will happen if you use the lower grade.
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i would try a little of the 87 regular & see how it does,dont fill it up . if it doesnt perform well , (as in noisey valves ,low power, poor mileage)then fill it with premium & stick to premium. also check in your owners manual for usable octanes, kawasaki dealership in your area can tell you also.