Honda Motorcycles

What will 91 octane do for my 1983 650 hawk that 87 can't?

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Wiki User
2008-08-18 00:08:22

Well, the bike is tuned for 87 octane, and it runs well. If you

use 91 or better, it really won't go any faster, just that the

engine will run cleaner, and possibly smoother. If you want more

performance, then you would have to adjust the timing. BUT, with

the price of fuel, and if you drive a lot, better just to leave it

as is. A tank here or there of 91 is good to do though.

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