87 vs 91 Octane for Yamaha F90

pckeen

Commander
Joined
Jun 20, 2012
Messages
2,067
Hi,

I have recently bought and had installed a Yamaha F90. I've been given contradictory advice from people about whether I should run regular (87 octane), or premium (91 octane) gas in the motor. Currently, I'm running 87 octane. The boat will sit for 5-6 months each winter.

Thanks,

Peter
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: 87 vs 91 Octane for Yamaha F90

Unleaded regular, 87 octane in the USA, will be fine, pc. I suggest that you add StaBil Marine to keep the fuel stable in storage.
 
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