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Thread: SR 50 - What type of gas should I use? The manual is confusing...

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  1. #1
    apriliaforum prov-nov
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    SR 50 - What type of gas should I use? The manual is confusing...

    Please US replies only.

    Is Unleaded 87 okay? I'm not sure what DIN 51 607/N.O.R.M/M.O.N mean as what the manual is spewing.

    The manual states: "Use super unleaded fuel as per DIN 51 607, minimum octante number 95 (NORM) and 92 (MON)."

    So is that a no on unleaded 87? Which is better 95 or 92?!?!

    Confusing!

  2. #2
    apriliaforum Junkie phidauex's Avatar
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    There are a lot of different ways to measure Octane, and different countries use different methods. This will either help, or confuse you more: [ame="http://en.wikipedia.org/wiki/Octane_rating"]Octane rating - Wikipedia, the free encyclopedia@@AMEPARAM@@/wiki/File:Gas_Station_Pump_Five_Octane_Ratings.jpg" class="image"><img alt="" src="http://upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Gas_Station_Pump_Five_Octane_Ratings.jpg/280px-Gas_Station_Pump_Five_Octane_Ratings.jpg"@@AMEPARA M@@commons/thumb/0/0f/Gas_Station_Pump_Five_Octane_Ratings.jpg/280px-Gas_Station_Pump_Five_Octane_Ratings.jpg[/ame]

    In the US, we use the (R+M)/2 method, or AKI (Anti-knock index). MON is Motor Octane Number. The average of that and the RON Research Octane Number (aka PON, Pump Octane Number), is what is labeled on US pumps. I have a guess that the NORM is equivalent to the RON, meaning the minimum RON is 95, minimum MON is 92, meaning in the US you should be pumping 93 octane (as labeled in the US).

    Now that said, 93 isn't available everywhere in the US. I run fine on 91 in Colorado.

    -Sam
    2001 SR50 DiTech, 8300mi - Malossi 70cc w/ ECU - Gianelli NRX pipe - Malossi Fly Clutch - Malossi Special Belt - 6.6g rollers - yellow contra spring - water trap. Zooom!

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    apriliaforum Junkie
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    CANADIAN RESPONSE HEHE



    I put in unleaded 87 by accident one day, and it ran like a snail I would put in the best octane thats available to you up to 95. I use 94 with great results, a little extra pep.
    06 Sr50 factory R \Morini/ HGT Derestriction 2 8 0
    Mallossi Multivar 2000\7gram rollers/ White contra spring
    custom made leo vince zx/s exhaust / 3*Woodruff key/ Water trap installed /tail tidy/ 3 inch stretch/adjustable riser/aprilia side stand/BGM hard case pod filter/K/N Tranny cover pod/

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  5. #5
    Moderator (ADSUM) Grenadiers's Avatar
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    Yeah, I'm using 91 Octane now until I get some more VP race fuel... DAMNED expensive thou, like $12 per gallon!!!! But, it's 112 Octane and it is a leaded fuel (the only way to get leaded fuel these days is in race fuel if I'm not mistaken). I usually get myself 5 gallons worth at a time.

    Last year I ran with it many times and she seemed to like it a lot!! I did find it more useful during the colder days of spring and fall, but she ran like a trooper in the summer too. That's when I hit my top speed of 106kPh. I am looking forward to see just how well she works now with the 26mm BING TBA assembly...

    Tempus Fugit
    06 SR50 (Morini)/AIRSAL 70CC BBK/NGK BR9EIX/Top Speed-117KPH (GPS)!!
    Rear Rack & Top Case/Buzzetti Side stand/Aprilia Racing Shock W/STR8 65mmRiser/HGT Stretch Kit
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  6. #6
    Aprilia Forum Moderator High Gain Tuning's Avatar
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    Fuel is another one of the items that will have a great effect on the way your single cylinder, single spark plug engine runs but varies extremely. My fuel knowledge is advanced as we had what we called a fuel farm at our GM Desert proving grounds in Mesa Arizona with fuel from not only all around the US but from around the world that we tested in our vehicles during hot climate testing.

    In one of my drivability training classes I would have my class of usually 12-15 GM technicians go out and bring back a fuel sample from different stations and record what they purchased. In the summer RVP (reid vapor pressure) inconsistencies cause major hot weather drivability issues amongst carbureted vehicles and EFI vehicles that run lower pressures than PFI does. In a nut shell and without pointing fingers at certain stations, rarely did we receive what we paid for. We also tested for alcohol content and found stations diluting their fuel with high amounts of E-85 to gain higher profits at the result of poor fuel economy for the customer.

    I will point the finger at the only station that consistently gave us what we paid for and worked best in our vehicles and that is Chevron. When my field office was at the GM Training Center in Tigard Oregon I had access to Chevron stations and the best fuels we could find were from them.

    The DiTech recommends high octane because the fuels available in most countries are not as refined as what we get in the US. IT IS NOT NECESSARY to put high octane in your DiTech here in the US. You will pay more and generally have poorer results as high octane fuels burn slower and on an engine that turns 9000 you don't want a slower burning fuel. Anyone that dyno's engines will also tell you lower octane fuels produce higher dyno numbers than high octane pump gas fuels. High octane Race fuel is different than high octane pump gas. I run 108 pre-mix in both my scoots.

  7. #7
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    Quote Originally Posted by High-Gain SR50 View Post
    Fuel is another one of the items that will have a great effect on the way your single cylinder, single spark plug engine runs but varies extremely. My fuel knowledge is advanced as we had what we called a fuel farm at our GM Desert proving grounds in Mesa Arizona with fuel from not only all around the US but from around the world that we tested in our vehicles during hot climate testing.

    In one of my drivability training classes I would have my class of usually 12-15 GM technicians go out and bring back a fuel sample from different stations and record what they purchased. In the summer RVP (reid vapor pressure) inconsistencies cause major hot weather drivability issues amongst carbureted vehicles and EFI vehicles that run lower pressures than PFI does. In a nut shell and without pointing fingers at certain stations, rarely did we receive what we paid for. We also tested for alcohol content and found stations diluting their fuel with high amounts of E-85 to gain higher profits at the result of poor fuel economy for the customer.

    I will point the finger at the only station that consistently gave us what we paid for and worked best in our vehicles and that is Chevron. When my field office was at the GM Training Center in Tigard Oregon I had access to Chevron stations and the best fuels we could find were from them.

    The DiTech recommends high octane because the fuels available in most countries are not as refined as what we get in the US. IT IS NOT NECESSARY to put high octane in your DiTech here in the US. You will pay more and generally have poorer results as high octane fuels burn slower and on an engine that turns 9000 you don't want a slower burning fuel. Anyone that dyno's engines will also tell you lower octane fuels produce higher dyno numbers than high octane pump gas fuels. High octane Race fuel is different than high octane pump gas. I run 108 pre-mix in both my scoots.
    If thats the case im going to be filling up from BP using there ultimate 102 octane unleaded

    or shall i use tesco 99 octane
    Aprilia sr 50 ditech 2003 spider man 3 edition

  8. #8
    apriliaforum prov-nov austin1971's Avatar
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    HG said" I run 108 pre-mix in both my scoots."

    Is this premix regular and highest combo or premix as in oil and fuel mixture.
    If it's the 1st what is the ratio?

    The sunoco link show 110 and the lowest. Are you buying something else?
    2007 SR50 R Factory DiTech Diablo Black
    Malossi 70cc BBK / Malossi ECU /Malossi V12 Reed Block /Malossi Multivar 2000 / Malossi Delta Clutch/ Malossi White Contra Spring / Malossi Kevlar Belt / Polini Gears 20/61 / High-Gain Gen III Adjustable Fuel Regulator / 6.8g rollers / Leo Vince ZX / Aprilia Racing Rear Shock / Marchald POD Air filter / NGK CPR6EB-9 / Stage6 260mm Front-Disc
    2001 Malaguti F12 Phantom
    Stage6 Sport Pro 70cc BBK / Malossi Primary gear/ Polini Kevlar Belt /19mm Carb / Pod Air Filter / ARROW exhaust / Stock: Variator & Clutch /4.0 gram Rollers

  9. #9
    apriliaforum expert toddlamp's Avatar
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    Quote Originally Posted by High-Gain SR50 View Post
    Anyone that dyno's engines will also tell you lower octane fuels produce higher dyno numbers than high octane pump gas fuels.
    Old thread, I know, but I have a quick question in regards to this: How low is too low? No, I am not about to put diesel fuel in the scoot but what if 85 octane is available? Should I use that instead of 87?
    2010 SR 50 R Factory (max speed so far downhill/tucked: 70mph indicated)
    1. De-restricted (2.8.0)
    2. Leo Vince ZXR pipe
    3. NGK ZMR7AP (gap: 0.035")
    4. Malossi Multivar 2000 w/7.2g Rollers
    5. White contrast spring
    6. Red clutch springs
    7. Malossi TC
    8. Malossi VL13
    9. Harbor Freight Water Trap
    10. Stage 6 gear kit 13/39
    11. HGT Fuel Regulator @ ~118psi

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  11. #11
    Aprilia Forum Moderator High Gain Tuning's Avatar
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    Quote Originally Posted by Lorenzo View Post
    So, HG, it's OK to go to any Chevron station and fill it up w/reg 87-octane gas?
    How do you feel about SHELL then?
    I only wish we had Chevron here. Their Techron (deposit cleaner) is one of the best formulations ever made and found now in most injector cleaners. You will get the best performance from the lower octane ratings.

  12. #12
    apriliaforum Junkie
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    chevron 94 octane is all my bike gets. I've tried one full tank of every octane they have at one time or another, but would have to say my bike likes the higher octane best. Definite power and throttle response difference, at 87 octane it just coughed and sputtered with lousy acceleration.
    Last edited by ABBYrider; 05-01-2011 at 05:38 PM.
    06 Sr50 factory R \Morini/ HGT Derestriction 2 8 0
    Mallossi Multivar 2000\7gram rollers/ White contra spring
    custom made leo vince zx/s exhaust / 3*Woodruff key/ Water trap installed /tail tidy/ 3 inch stretch/adjustable riser/aprilia side stand/BGM hard case pod filter/K/N Tranny cover pod/

  13. #13
    apriliaforum expert Lorenzo's Avatar
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    Quote Originally Posted by High-Gain SR50 View Post
    I only wish we had Chevron here. Their Techron (deposit cleaner) is one of the best formulations ever made and found now in most injector cleaners. You will get the best performance from the lower octane ratings.
    Great to know, HG! I was partial toward SHELL and Texaco, because the butt-dyno was telling me that they give me the most oomph for my $$.

    We've got Chevron's by the boatloads here, so not a prob! Still wishing there would be some pure gas available here - w/no ethanol, like they had over at
    Tail of the Dragon.

  14. #14
    apriliaforum expert shrubman's Avatar
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    HG,
    Are the race fuels you use pure gasoline and if so, how do they differ from pump gas of the same octane?
    Shrubman

    2009 SR50 R Factory


    Engine:
    HGT PFI Conversion
    HGT-Modded Bing 26mm Throttle Body
    Malossi 86CC Cylinder
    Malossi MHR Big Bore Exhaust
    Malossi VL13 Reed Valve
    Pro Porting Intake Manifold and Spacer
    Pro Porting Double Layer "Air Plus" Air Filter

    Transmission:
    Malossi Multivar 2000 MHR Team (2008 Model)
    Malossi 14/39 Primary Gears
    Malossi Delta Clutch
    Malossi Kevlar Belt

    Other:
    Stage 6 Adjustable Shock Riser
    HGT Billet Aluminum Brake Levers
    Buzzetti Side Stand
    Motorkit Rear Hugger

  15. #15
    Aprilia Forum Moderator High Gain Tuning's Avatar
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    Quote Originally Posted by shrubman View Post
    HG,
    Are the race fuels you use pure gasoline and if so, how do they differ from pump gas of the same octane?
    Here's some good data for Sunoco race fuel octanes

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