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Good point D. I had no idea we did octane different. For the record, 87 is the lowest grade fuel you can get at a pump in SoCal. Ghetto Gas that works for everyone that isn't trying to prove something...next option is 91, and of course 93...

I've tried all three options for gas in the 17', and it didn't seem to matter all that much.

Racing gas may be different, but you need to tune to that I think.
 

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In northern Cali now, there's 87, 89, 91. I started with 87 per Suzuki instructions, but 89 runs smoother and quieter.
 

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if the bike calls for 87 use 87 if you get valve knock or ping go up one grade. 91 or hi-test burns slower so it's for hi compression engines, using it in the SV it doesn't all burn and creates carbon. i would like to see the plugs of anyone using hi-test. I COULD BE WRONG IT'S POSSIBLE.sorry for not changing out the caps, lazy
 

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if the bike calls for 87 use 87 if you get valve knock or ping go up one grade. 91 or hi-test burns slower so it's for hi compression engines, using it in the SV it doesn't all burn and creates carbon. i would like to see the plugs of anyone using hi-test. I COULD BE WRONG IT'S POSSIBLE.sorry for not changing out the caps, lazy
The lowest octane available in the UK is 95 RON, which equates to 91 US. I also fill up with 99 UK (95 US) from time to time, as the 99 has a good detergent package for cleaning injectors, etc. The plugs on my my old K6 SV, and on my current Gen 3 show almost no carbon deposits on the ground strap or the ring the ground strap is welded to, and have always been a good healthy colour.
 

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the compression rate for the sv is 11.5,1 so i guess that's high compression.the plugs in my yamaha are almost white, they say ethinol burns much cleaner so it's normal to be white.if they were any tan color i would think they're rich. yamaha is lower compression so not a good comparison. i can turn the pms screw in and out to change the color of the plugs
 

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I'm using 98 octane (RON) on all my vehicles including my lawn mower and snow blower. The reason for this is that the 95 octane have 10% ethanol in it, while 98 octane is 100% pure petrol. I've heard that ethanol fuel have terrible shelf life and can cause pitting and rusting in the fuel tank injection system because of water retention. It's also harder on rubber hoses gaskets etc. so I rather pay more to get ethanol free fuel.
 
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