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i have a 2002 shadow vlx 600.....manual say use 87 octane....all my friends say and use 93 octane...they say its better.......is there a benefit/advantage for using 93 octane over 87????? or a disadvantage using 93??? over 87 octane!!!!!
 

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No real benefit, no imagined benefit, no benefit period.
Higher octane gasoline doesn't burn hotter, or slower, or faster, or keep your engine cleaner. It is not a higher quality fuel.
Octane increases gasolines resistance to ignition from heat instead of spark. That is it, nothing more.

Now, if you increase the timing, or compression of your engine you may need higher octane fuel. If you run your engine under a greater load, in higher ambient air temperature, or often at WOT conditions, you may need higher octane gas.

Stop listening to your friends, they are just plain wrong.
 

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im new to all this....what is pinging??????
Well then you should google some of this stuff, you'll find all your answers and it makes for good reading.
It is detonation, or when the fuel burns to fast for an engine, weather its or low compression<(edit - sorry that was suppose to be worn rings/burning oil) or some other internal problem. timing is to far advanced, extremly lean causing hot spot in the cumbustion chamber causing the fuel to ignite before its suppose to, over time can cause severe engine damage.
you may have heard an old car pinging when accelorating, it will sound like you have marbles in your engine, or a loud metalic rattling type noise.
google preignition, or detonation.
 

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Higher octane gasoline doesn't burn hotter, or slower, or faster, or keep your engine cleaner. It is not a higher quality fuel.
Octane increases gasolines resistance to ignition from heat instead of spark. That is it, nothing more.

QUOTE]
tryin to keep it simple gat, the wording doesnt come to me all that easy at times. So thanks for elaborating.

Octane Myths



High octane gasoline improves mileage.
In general, if your car is designed to run on 87 octane gasoline, high octane gasoline will not improve
mileage. If switching to high octane gasoline does improve mileage, you might find that your engine, or its
control systems, need repair.


High octane gasoline gives quicker starting.
No, it doesn’t.


High octane gasoline increases power.
If your car is designed to run on 87 octane gasoline, you shouldn’t notice any more power on high octane
gasoline. Again, if it does make a noticeable difference, your engine, or the engine’s electronic control
systems, may need repair.


High octane gasoline has been refined more – it is just a better product.
Additional refining steps are used to increase the octane; however, these additional steps do not necessarily
make the gasoline a “better” product for all engines. They just yield a different blend of hydrocarbons that
burn more slowly. The additional steps also increase the price.

 

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your bike only needs 87. anything higher than that and your just wastin' your money.
 
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