|
|
Post by peacedawg on Feb 3, 2013 15:40:58 GMT -5
I have a mc-54-250b in the owners manual it says to run 90 plus octane but in the yamaha manual which is basically the same engine it say's to run regular 87 unleaded which one is right since they are basically the same engine except the roketa claims to be a 257cc and the yamaha say's it's a 256cc engine whats the difference or does it even make one. I used to live in PA and now I live in SC. down here you can get the unleaded high octane with no ethenol does that make a difference because I've used seafoam and the blue enzyme additive since I've had the scoot and I've allways used high octane can someone clear this up for me would it hurt to mix the two or should I stay with the 90 plus
|
|
|
|
Post by rapidjim on Feb 3, 2013 15:47:17 GMT -5
IMO Run the higher octane non ethonol
Jim/Owner
Rapid Repair
|
|
|
|
Post by Scooter Elements on Feb 3, 2013 16:14:24 GMT -5
Octane ratings measure a gasoline's ability to resist engine knock — a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders. Unless you have high performance parts like High Compression piston and such then there is no need for higher octane gas. My scooter has High Compression piston and high compression valves and i use premium in it because of all the performance parts but a stock engine will run perfect with regular and a little bit of seafoam every once in a while  |
|
|
|
Post by inuyasha on Feb 3, 2013 16:25:27 GMT -5
Hi
Easiest answer is to use the octane that your scoot runs best on with out any detonation
The higher the compression ratio the higher the octane
My Aprilia has 12.5:1 so i run the highest ocatne i can get in her
Take care and ride safely
Yours Hank
|
|
|
|
Post by prodigit on Feb 3, 2013 20:02:42 GMT -5
Octane ratings measure a gasoline's ability to resist engine knock — a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders. Unless you have high performance parts like High Compression piston and such then there is no need for higher octane gas. My scooter has High Compression piston and high compression valves and i use premium in it because of all the performance parts but a stock engine will run perfect with regular and a little bit of seafoam every once in a while Not really true, some bikes run so lean, that pre-ignition is possible, just because of running so hot. I'd say, look at the performance of the bike. If it runs fine on 87 oct fuel, keep using that. If it's MPG gets better, or you notice a performance increase (eg: higher top end) with 89-91 oct fuels, use that. If performance increases with 93 oct fuel, then use that. Is most cases 93 oct fuel would be the same as throwing money down the drain, as there will be no performance increase. Esperiment with it, and stick with what works best for you. Also remember, when you're still breaking in the engine, you can't really tell if one fuel will work better than another. You'd have to wait until you have at least 100-500 miles on the bike, and test fuels over at least 2 fuel tanks; unless you pretty much ride the same trip, under the same circumstances. |
|
|
|
Post by skuttadawg on Feb 4, 2013 2:18:39 GMT -5
ONLY use premium gas . My scooter dealer makes buyers sign a waiver saying only use premium . I put in 87 by mistake as I had a pretty lady distract me , 1 mile later poof the POS cracked a piston with under 50 miles on it . Here is a list of ethanol free gas stations in SC . Note some only have 87 ethanol free where some all of their gas is ethanol free pure-gas.org/index.jsp?stateprov=SC |
|
|
|
Post by scootnwinn on Feb 4, 2013 10:39:16 GMT -5
My Burgman loses 2 mpg on high octane fuel. The Owner's Manual says clearly to run low octane and it's right. More is not always good.
|
|
|
|
Post by EPAhater on Feb 4, 2013 10:49:00 GMT -5
Own two of these scooters, where I live I can get ethanol free and ethanol gas, I run ethanol free in everything I own when I can.
The 250B will run fine on the lower octane gas and putting seafoam in every tank waste of money and time. About every 5th or 6th tank is fine and even then if it's running well it's not needed.
Don't waste your money with higher octane gas for this scooter and that's coming from someone who owns and rides two of them to the tune of over 16k in miles.
|
|
|
|
Post by rapidjim on Feb 4, 2013 11:35:51 GMT -5
The key here is non ethonol fuel if it is available.
Jim
|
|
|
|
Post by prodigit on Feb 4, 2013 18:59:12 GMT -5
I did several (part) trips to the everglades on my BMS TBX260 EFI; always same road, different fuel for testing; and I can tell you for that particular bike, the 87 oct fuel, and the 93oct fuel worked just as good. 89-91 oct fuel (mid-grade) gave me a performance edge of +2 to +4MPH.
For that bike, mid-grade was the best option.
|
|
|
|
Post by tinstar on Feb 13, 2013 23:37:16 GMT -5
I wish that we had gas with no ethanol in it...ruins engines! I hate it!
|
|
|
|
Post by skuttadawg on Feb 14, 2013 0:04:39 GMT -5
Well you can use midgrade which is a blend or regular and premium top be safe . Here is list of ethanol free gas stations pure-gas.org/ |
|
|
|
Post by gregsfc on Feb 14, 2013 6:47:53 GMT -5
I agree that one should use only the minimum octane required by the manufacturer, however, if one can find ethanol-free, I would use it. I lose 3mpg when using E10 as opposed to pure gas, which makes sense, because ethanol has only 70% of the energy density as gasoline, plus its really bad for smaller engines, especially if the equipment is sitting around alot in the winter.
Below is a link to a website that will help you find out if pure gas is available in your area.
pure-gas.org
|
|
|
|
Post by nate7504 on Feb 16, 2013 7:23:05 GMT -5
When I bought my scoot the dealer only said use non ethonal,he was very clear about that,I always run premium and have used low and mid,and they all feel the same to me as far as performance,but my tank is only 1 gallon so I don't mind spending an extra few cents.just out of curiosity is the gas in china the same as here,as far as octane,ethonal use and so on?
|
|
|
|
Post by rockynv on Feb 16, 2013 10:11:19 GMT -5
I have a mc-54-250b in the owners manual it says to run 90 plus octane but in the yamaha manual which is basically the same engine it say's to run regular 87 unleaded which one is right since they are basically the same engine except the roketa claims to be a 257cc and the yamaha say's it's a 256cc engine whats the difference or does it even make one. I used to live in PA and now I live in SC. down here you can get the unleaded high octane with no ethenol does that make a difference because I've used seafoam and the blue enzyme additive since I've had the scoot and I've allways used high octane can someone clear this up for me would it hurt to mix the two or should I stay with the 90 plus I go by the compression ratio as a starting point. If the compression ratio is 9 to 1 or lower then regular between 9 to 1 and 10 to 1 midgrade and above that premium. If Rocketa's version of the Yamaha 260 has an oversized piston then that could have boosted compression enough to require premium. My current bike has a compression ratio of 11 to 1 so it needs Premium. |
|
|
|
Post by tinstar on Feb 17, 2013 18:15:20 GMT -5
Well you can use midgrade which is a blend or regular and premium top be safe . Here is list of ethanol free gas stations pure-gas.org/Thank you for this! |
|
|
|
Post by wutzthedeal on Feb 17, 2013 19:59:23 GMT -5
I ran strictly 93 in mine for the first 3k, then I started experimenting and it turns out 89 (mid grade) is best here for mileage and smooth operation.
|
|
