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Carburetor Jetting - Should you go lower to run higher octane fuel?

Discussion in 'Tech Tips' started by Th3_Huntsman, Jun 16, 2014.

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  1. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Thanks Murdo. Appreciate your knowledge in this area.

    Cheers
     
    Frankster, Jun 17, 2014
    #21
  2. Phil

    Phil Senior Member Contributing Member

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    You have opened a can of worms that can no longer be shut. Everyone has a take on the matter which was to be expected. My question to you is this: why would you think that pouring higher octane fuel into your tank would be beneficial ??? Lets take a look at the manual for your Kawasaki zxr250A model. What does the good book say re: fuel required for your model?, think it states 91, not 95 nor 98. Tend to think that the engineers at Kawasaki designed and built your bike to run optimally on 91 octane fuel, and that my friend is what I would continue to do if it were me.
    There is no actual benefit that I can find anywhere so far that shows any improvement in any area that justifies higher octane than 91. By sticking to 91 the benefit can be felt immediately, your hip pocket!
    That's my 2 cents worth.
     
    Phil, Jun 17, 2014
    #22
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    The 'fuel debate' is always a pain in the haemorrhoids ....... and I agree with u totally Phil , but heres another can of worms to open for desert .....
    How much different is the 91 manufactured 25 years ago compared to wats made now in regard to quality , additives, etc yada yada yada

    And risky .... where are u? ..... are u still using 98 in everything including your model aeroplanes and your fuel injected hair dryer? :crazypilot:


    :dance2:
     
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    GreyImport, Jun 17, 2014
    #23
  4. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    Thing is I have to ride 30 mins out if my way just to get normal 91 because everything around me has e10. That is all, having cleaned a set of carbs with E10 left in them I'd prefer not too have to again. Agreed on the can of worms though but that's what this thread was intended for.
     
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    Last edited by a moderator: Jun 18, 2014
    Th3_Huntsman, Jun 17, 2014
    #24
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Id be getting a few jerry cans and stocking up so u can just fill up the bike at home ...1 trip in the car to cover yourself for a month or wateva.
     
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    GreyImport, Jun 17, 2014
    #25
  6. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    FYI everyone, 95 runs pretty good and is what I will be running in the yellow one.
     
    Th3_Huntsman, Jun 17, 2014
    #26
  7. risky

    risky risky

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    still running 98 and keep a jerrycan full at home as not all servo,s have it. does not dry out and leave residue like e10.have not ridden a bike since car fell on me due to dizzy spells from swaybar/steering rack across face.reason i use 98 8s some of my bikes are 12/1 compression and i prefer to pay more than spend time cleaning carbs.
     
    risky, Jun 18, 2014
    #27
  8. o0ultima0o

    o0ultima0o Active Member

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    From what I've realised running 98 in my mc22 on stock plugs cr9eh9 is that it feels clogged and powerless below 8k rpm. I know that power for these bikes don't kick in until very late, but for commuting, it is quite crap compared to using 91 (non-e10).

    Luckily, my suburb's servos still like to stock 91 alongside e10.
    For my friends that have the same bike but can't find stock91, I've swapped their plugs for CR8eh9's (hotter plug). So far so good. Only downside is their bikes runs slightly hotter at >100km/h and >8k rpm.

    I wouldn't play with the jets - carb sync, timing and plugs will fix this whole issue running on high octane.
     
    o0ultima0o, Jun 18, 2014
    #28
  9. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    That's another thing in itself as well ultima cheers. Just some ideas for the project bike.
     
    Th3_Huntsman, Jun 18, 2014
    #29
  10. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Try it for your self and make up your own mind.
    My Honda ST1100 runs sweet on the 95, not so well on 91 or 98 so that is what I stick with (when available). Another point is that it will do 525+ Km per tank on 95, but only about 450 on the 91, so the extra cost is offset by the better mileage.
     
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    Murdo, Jun 18, 2014
    #30
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