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  1. #1
    Newbie
    Posts
    1

    S40 Which grade of gas?

    Hi,

    I just got a 2006 S40, no manual, which grade of gas does the bike run on?

    Sorry for the simple question but I can't get a hold of the previous owner to ask him.

    Thanks,

    Rob

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  3. #2
    Lost but forgotten

    My Bike(s)
    2012 Ninja 1000 ABS, 2002 Bandit 1200 S, 2002 Honda XR50R, 1992 Honda CR125R
    Location
    St. Cloud, MN, USA
    Posts
    20,861
    87 unless you get knocking. That goes for almost every modern motorcycle, btw. Welcome to M-J! Please fill out your profile.
    'Busa shock, Racetech forks, Holeshot stage 1 & pipe, Hella headlights, CBRXX clipons, Givi E360 & V46, Zumo 550, Pilot Road 2CTs | Symtec grip heat
    Arai Signet GTR | Joe Rocket Meteor boots, Alter Ego pants, jacket
    | Gerbings liner | Alpinestars SP-1 gloves | Hanes boxer-briefs
    Gems for motorcyclists

  4. #3
    Banned
    Posts
    197
    IF I use 87 on my new C50T, I get a lot of valve noise. I went through all grades, and settled, right now, on 91. I get the least engine noise with it, and 93, but 91 was the lowest denominator.

    You may want to experiment with grades, and take your pick. The engine is designed to run on 87, but timing is tight with new engines. These engines don't REALLY beak in till the 12 - 16k mark anyway. Once the engine "loosens up" (just a simple term), then you can go back down to 87. My uncle has had his volusia since 04, ran 91 till he got about 12K, when he was able to go back to 87 with no excessive engine noise.

    I am sure the expert will chime in, but this is MY experience, and what I am doing, and will do till I break 12K mark and revisit the 87 octane scene again.

    Stay with 87 till your initial break in period, as higher octane runs hotter in the cylinders.

  5. #4
    M-J Lifetime Achievement Award
    My Bike(s)
    '10 Kaw Vulcan 900 Custom
    Location
    Ocala, FL
    Posts
    8,614
    Quote Originally Posted by Powerslave View Post
    as higher octane runs hotter in the cylinders.
    Good post.........except for this!
    Don't believe everything that you think.

  6. #5
    Beer. Nature's Unstoppable Force.

    My Bike(s)
    '06 XB12X
    Location
    2040 N. Dale Mabry Hwy., Tampa, FL 33607
    Posts
    13,278
    Quote Originally Posted by riron1977 View Post
    Hi,

    I just got a 2006 S40, no manual, which grade of gas does the bike run on?

    Sorry for the simple question but I can't get a hold of the previous owner to ask him.

    Thanks,

    Rob
    Put 87 in my wife's.........no probs.

  7. #6
    In The Zone
    My Bike(s)
    2008 ZZR600
    Location
    Under a rock in Texas
    Posts
    2,757
    Quote Originally Posted by Easy Rider View Post
    Good post.........except for this!

    The "other" ZZR rider.

  8. #7
    Forensic Bug Splatter Analyst
    My Bike(s)
    05 Boulevard C50 LE, 06 S40 (wife's bike)
    Location
    Lexington, KY
    Posts
    4,158
    My wife uses 87 also, no problems here either.

  9. #8
    Clutch Cadet
    My Bike(s)
    2004 GSXR 750, 2003 Kawasaki Mean Streak, 2007 Susuzki DRZ400s. 1973 Kawasaki 175 Enduro
    Location
    Lancaster, Pennsylvania
    Posts
    908
    87 should work fine. If you are in doublt put in 89.

    Quote Originally Posted by riron1977 View Post
    Hi,

    I just got a 2006 S40, no manual, which grade of gas does the bike run on?

    Sorry for the simple question but I can't get a hold of the previous owner to ask him.

    Thanks,

    Rob
    2004 Gixxer 750
    2003 Mean Streak 1500
    2007 DRZ400S
    1973 F7 Enduro
    Location: Lancaster, Pennsylvania

  10. #9
    Just Won't Go Away !
    My Bike(s)
    '08 Bandit, '09 Wee Strom
    Location
    St. Cloud, MN 3rd house NW of the Depot
    Posts
    4,900
    I have been running 87 since the day of purchase with zero miles and zero problems. My understanding is that lower octane burns more quickly than high octane and thus is more fully and evenly ignited. High octane will burn more slowly and unevenly which can cause unburned fuel to enter the exhaust system and possibly leave deposits on the valves and potentially ignite within the exhaust system. Unlike today's modern cars our bikes are not nearly as sophisticated. They put those fancy engine computers in cars that can detect predetonation (pinging from fast burning low octane fuels) and the computer can automatically adjust the timing to prevent predetonation. Our motorcycle engines are not nearly as complex and are more vulnerable to such octane varieties. Running too low octane (fast burning) could result in the fuel burning too quickly for the average motorcycle engine burning the fuel before the piston has come to tdc and thus working against the engine, and possibly damaging it.

    A fine line but there you go. Don't know if it is all correct but as I said this is my understanding.

  11. #10
    Newbie
    My Bike(s)
    2007 Suzuki S40
    Location
    London, On, Ca
    Posts
    15
    87 posted in the manual. As "Frostbitevinnie" states, low detnotation is a fact in higher octane fuel. This fuel is better suited for High compression engines which can properly compress the higher octane sufficiently and with the low detnotation ignite them when required. The low compression ratio of the S40 is much better suited for low octane fuel which can ignite faster and when needed. Interestingly enough, in these cases a smoother running engine and more power translated to a lower octane fuel. More is not always better...

    Hope this helps...

  12. #11
    Just Won't Go Away !
    My Bike(s)
    '08 Bandit, '09 Wee Strom
    Location
    St. Cloud, MN 3rd house NW of the Depot
    Posts
    4,900
    I was reading an article not too long ago concerning octane vs performance. The test was performed using a standard sport bike. With 87 octane they actually got 10 more hp over using 110 octane.

  13. #12
    Seat Tester
    My Bike(s)
    2012 Yamaha Stryker 1300
    Location
    Ontario, Canada
    Posts
    69
    "The best money can buy" as my Suzuki Dealer told me when I bought my S50
    I do not think you will be saving much on gas by using lower grades
    Money come and go, Friends stay forever.


 

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