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Thread: Mixing 91 with 95 together

  1. #1
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    17th March 2017 - 09:13
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    Mixing 91 with 95 together

    Hello everyone!

    So I had recently acquired a 2003 Honda CB900 from a private sale (in the a very clean condition for it's age I might add =P).
    At the moment, I am using 95 since the previous owner used it as well. However, I would like to make the switch to 91 just to save a few extra dollars.

    The only thing stopping me is that I'm not too sure if it's a good idea to mix 95 and 91 in the same tank. Is this a good idea?

    Additionally, does anyone have links to resources where I can learn more about the mechanics behind motorcycles?

    Cheers

  2. #2
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    25th October 2002 - 17:30
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    Mixing the two shouldn't cause any issue at all. I don't use 91 in anything, based on my own experience and listening to those that have worked in the petrol industry here. My suggestion would be to run a few tanks on 95, record your fuel consumption, then repeat with 91 and compare.

  3. #3
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    as long as you get the portions right it wont be a issue. you always want whole octane numbers or you're firing order will be out by half (or whatever degrees the decimal is)

    ie if you mix 50% of 95 and 50% of 91 you end up with 93 - which is good, but if you got say 60% of 91 and 40% of 95 you'd be left with 92.5 octane which will cause irreversable engine damage cos your cam timing will be out by 5 degrees, and 5 degrees on a four stroke (5*4=20!!!) is going to lock up your rear wheel and basically kill you.

  4. #4
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    Quote Originally Posted by onearmedbandit View Post
    Mixing the two shouldn't cause any issue at all. I don't use 91 in anything, based on my own experience and listening to those that have worked in the petrol industry here. My suggestion would be to run a few tanks on 95, record your fuel consumption, then repeat with 91 and compare.
    It's a Hornet. Mine has only done 140k on 91, but I think it's fine?

    Ignore Azkle, he's off the meds again...
    Quote Originally Posted by Jane Omorogbe from UK MSN on the KTM990SM
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  5. #5
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    Don't mix 91 and 95 together, it becomes flammable.

  6. #6
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    Quote Originally Posted by Akzle View Post
    as long as you get the portions right it wont be a issue. you always want whole octane numbers or you're firing order will be out by half (or whatever degrees the decimal is)

    ie if you mix 50% of 95 and 50% of 91 you end up with 93 - which is good, but if you got say 60% of 91 and 40% of 95 you'd be left with 92.5 octane which will cause irreversable engine damage cos your cam timing will be out by 5 degrees, and 5 degrees on a four stroke (5*4=20!!!) is going to lock up your rear wheel and basically kill you.
    The maths checks out.

  7. #7
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    However octane rating refers to octagonal engines (8 strokes) 8*5=40 so you'll die twice as quickly

    Sent from my D6503 using Tapatalk

  8. #8
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    It's a honda ... the bloody thing will probably run (ok-ish) on diesel ...


    Try it ... let us know how you got on ...
    When life throws you a curve ... Lean into it ...

  9. #9
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    Quote Originally Posted by Mike.Gayner View Post
    The maths checks out.
    So would his daughter .... if you're ok with beards ...
    When life throws you a curve ... Lean into it ...

  10. #10
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    The Hornet 900 manual states 91 or higher.


    I owned one for 8 years from new.

    I ran it for lengthy periods on both recording MPG's,

    Performance wise there was zero difference, no spluttering, pinging, or any adverse mechanical reaction.

    Mileage was likewise indistinguishable between the two.

    I ended up filing up at whatever pump was closest and free - mixing made no difference.

    My conclusion for that specific bike:

    91 & 95 differ in colour and price.

    Otherwise zero difference.

    It's a peach of a engine that will last forever if you treat it to regular fresh oil.

    PS - don't add a K&N air filter - they are noted on this specific bike to bugger up fueling unless you have a custom tune Power Commander fitted.

    Do consider talking to KSS regarding replacement front fork springs - cheapest handling improvement you can do.

  11. #11
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    Quote Originally Posted by Yung360 View Post
    Hello everyone!

    So I had recently acquired a 2003 Honda CB900 from a private sale (in the a very clean condition for it's age I might add =P).
    At the moment, I am using 95 since the previous owner used it as well. However, I would like to make the switch to 91 just to save a few extra dollars.

    The only thing stopping me is that I'm not too sure if it's a good idea to mix 95 and 91 in the same tank. Is this a good idea?

    Additionally, does anyone have links to resources where I can learn more about the mechanics behind motorcycles?

    Cheers
    Honda asks for a minimum of 91 Ron.
    91 will be fine its generally written under the filler on a honda.
    Take special attention to the coolent/antifreeze used only use the recomeded types and proportions Hondas are a bit suceptable to the warm fuzzies/furries
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  12. #12
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    Quote Originally Posted by husaberg View Post
    Honda asks for a minimum of 91 Ron.
    91 will be fine its generally written under the filler on a honda.
    What if you can't get 91 Ron, & can only get 91 Darren or 91 Colin? Will that work too?

  13. #13
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    Quote Originally Posted by sidecar bob View Post
    What if you can't get 91 Ron, & can only get 91 Darren or 91 Colin? Will that work too?
    shut up or i will tell your Mon
    Ron measures all NZ pump fuels he must be a busy buggar
    Ps Bmw service agents shouldn't make jokes about fuel or emissions.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  14. #14
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    Quote Originally Posted by husaberg View Post
    shut up or i will tell your Mon
    Bmw service agents shouldn't make jokes about fuel or emissions.
    VW service agents even less so.

  15. #15
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    Quote Originally Posted by sidecar bob View Post
    VW service agents even less so.
    Zee other germans are not so squeaky
    http://www.dw.com/en/german-emission...bmw/a-18937447
    The results appeared to show that Mercedes and BMW models are also cheating on emissions tests
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

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