- This topic has 8 replies, 8 voices, and was last updated 14 years, 2 months ago by BouncingRadical.
need help
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February 10, 2010 at 4:06 am #3699jojobeans316Participant
what kind of gas should i put in my 09 ninja 250r reg prem sup ? also even when my bike is warm irev it up a little a bit it sometimes shuts off any 1 know why ? red 09 ninja 250r 720 miles on it now if that will help.!
February 10, 2010 at 6:52 am #24497eternal05ParticipantI can’t see how it’d hurt to put better fuel in, but I don’t think compression gets very high in the 250R engine so you shouldn’t need more than regular unleaded.
…anybody know better?
February 10, 2010 at 2:43 pm #24501IxecapadeParticipantI always put what’s been put in a machine… and in most cases its the good sheeet- its a performance machine might as well put performance fuel in it even if it hasn’t seen a track. [yet]
February 10, 2010 at 4:00 pm #24503IBA270ParticipantOne thing to remember about premium gas; it doesn’t sell as well as the cheap stuff, so it tends to sit in the tanks longer. Don’t assume because you pay more that the quality will be better… I run regular in the BMW and Ducatis, and race gas in the race bike (15:1 compression).
February 10, 2010 at 7:14 pm #24505CBBaronParticipantThe Ninja 250r takes 87. Nothing to be gained by putting 90+ octane fuel in it. Just costs more.
Craig
February 10, 2010 at 7:17 pm #24506Gary856ParticipantThat seems like a minor carbureter adjustment problem. For such a new bike it’s obviously under waranty so just take it back to the dealer.
Associating 91 octane with the word “premium” is false advertising, a big marketing lie to charge ill informed consumers more money. There are bikes/cars that are designed to run on 91 octane, but for the majority of bikes/cars that are designed to run on 87 octane, paying higher price for 91 octane is like paying for and taking medecine that you don’t need. Check your owner’s manual for your bike/car’s octane requirement.
February 10, 2010 at 10:21 pm #24513Sean_DParticipantThere is definitely some marketing hype involved by manufacturers in order to advertise certain specs where they will say a vehicle “requires” a certain Octane fuel. The truth is that most don’t really “require” it unless you need to get every last ounce of performance out of the vehicle. Generally the differences are not nearly as great as they would lead you to believe and the percentage of performance gain not as great as the percentage of price increase.
My bike “requires” mid-grade (89), but I have never been able to tell any appreciable difference between 87 and 89 in terms of performance. I know there isn’t that big a price difference between regular and mid (about .10) when you are only putting in 3.5-4 gallons on average. But why pay for it when you don’t need to?
Putting in higher octane than your vehicle requires can at best have no affect whatsoever and in some instances can actually cause adverse performance. But if your bike requires 87 and your putting in premium chances are your just pissing away .20 a gallon.
USA Today had a good article on fuel octane and performance many years ago…
http://www.usatoday.com/money/autos/2003-07-30-premiumgas_x.htmFebruary 11, 2010 at 12:07 pm #24520eternal05ParticipantIt goes like this: premium gas is more stable (i.e., less likely to spontaneously ignite, especially under pressure) than lower fuel grades. This is because it has a higher octane rating, or specifically, its composed of a higher ratio of stable octane vs. unstable heptane. The bottom line? The higher the compression ratio of your engine–in other words, the more your engine compresses the fuel/air mixture before combustion–the riskier a lower octane fuel will be since heptane gets more unstable under pressure. By “risk,” I’m referring to the risk of engine knock, which is when fuel spontaneously ignites at the wrong time in the engine cycle.
If your premium-requiring vehicle runs fine on regular, fine. Lucky you. If you’re less lucky, however, using lower-grade fuel can mean a bunch of knock, especially when certain cars are driven in anger. A turbocharged car’s compression increases proportionally to the amount of exhaust generated, meaning that driven very aggressively, you’re more likely to experience knock than if you’re just puddling around. My car, for instance, is not only turbocharged (a mechanism for increasing compression), but I can increase the boost pressure on the fly. At stock setting, I actually do occasionally get a nice backfire with lower grades of fuel (though it’s not common). At severely increased boost pressure, on the other hand, I actually need higher-than-premium. I don’t ever use that except for the occasional lapping (track) day.
February 11, 2010 at 8:25 pm #24521BouncingRadicalParticipantThe needles come with a ‘preservative’ on them from the factory. Sometimes this melts and will clog up a jet before uncrating. Try putting some carb cleaner in (make sure you use the right proportions) and let it idle for a while then take it through some slow revs and become more aggressive till the jet is clean. If it doesn’t come clean take it in for warranty work.
As for using high octane fuel, your engine is designed for low grade fuel and gains no benefits from high octane fuel. Mid grade is also a rip off, it’s 60% low and 40% high grade mix, blended on the spot or before the truck picks it up, just an FYI.
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