how low of octane

[wiesman]

how low of octane will i be able to run in my 450R with 13:1 piston without damaging it. I only ask because i still want to do some trail riding and won't always be able to get race fuel.

[stupid driver]

id say at least 100 octane, if you want your engine to sound half normal without the pinging noise.

[project250x]

People overexagerate the octane they need. I know with a 12-1 it is ok to run 93 octane so i'm guessing anything 94 and above you'd be fine if you have access to it. If not just throw some octane boost in with the 93 and you won't have any problems.

[Steve-o 400EX]

I would run strait leaded 104 octane if i were you. Anything above 11:1 needs race gas. I run a mix of 94 and 104 in my 10.8:1 416.

[LTZ400rider]

Originally posted by Steve-o 400EX
I would run strait leaded 104 octane if i were you. Anything above 11:1 needs race gas. I run a mix of 94 and 104 in my 10.8:1 416.

why the hell would u need race gas for that. my z400 is like 11.3:1 stock and i only need 87 octane

[LazeR]

Originally posted by LTZ400rider
why the hell would u need race gas for that. my z400 is like 11.3:1 stock and i only need 87 octane

i dont and wouldnt run 87 in my stock (except pipe and filter) 400ex! I'd say probably around 100, since 10.8:1 is the highest compression you should really go on 92-94 pump gas, or so i have been told.

[frosti108]

no. theres no problem with running 87 or 89 with 11:1 compression. with 13:1 though i would make it a point to go out and buy some 110 leaded :D even though you would probly be fine with sunoco ultra 94

[buster369]

I have a lil over 12:1 and runs fine on 93 pump gas

[markk]

Originally posted by wiesman
how low of octane will i be able to run in my 450R with 13:1 piston without damaging it. I only ask because i still want to do some trail riding and won't always be able to get race fuel.


Buy fuel in bulk, I know there is a place near us that sells it by the 55 gal drums!!!!!!

[stupid driver]

Originally posted by markk
Buy fuel in bulk, I know there is a place near us that sells it by the 55 gal drums!!!!!!
i did that a couple of years ago and sold it to my friends when they needed it. I made a killing that summer :macho

[300exOH]

I would start with premium pump gas (93 or higher) and if it runs okay and doesn't ping or knock then you should be fine. Why run expensive race gas when you don't need it? Especially with the higher fuel prices.

[cals400ex]

he is running a 450r so the fuel requirements might be much different than that of a 400ex. i think the stock compression is 10.5:1 on those bikes. i have a feeling you might want to run some race gas. i would get with some engine builders to see what they recommend. my 11:1 426 seems to run just as quick with pump fuel as it does with race fuel. i do a lot of open area riding so maybe it just stays cooler that way.

[PBlackmon]

no less than 93

[markk]

Originally posted by stupid driver
i did that a couple of years ago and sold it to my friends when they needed it. I made a killing that summer :macho

thats TRUE!!!!!!! :D

[400-416EX]

If atll possible mix c-12 with 93-94 octane and you will be fine. I usally mix 50-50 on my 416

[Aceman]

Originally posted by LTZ400rider
why the hell would u need race gas for that. my z400 is like 11.3:1 stock and i only need 87 octane

Yours is liquid cooled:o

[panteramatt]

Listen to someone who knows what there talking about. The 450r doesnt require as high of an octane cause the motor is designed differently than the 400ex or even the yzf and it has something to do with the crankcase pressure. Well anyway, I would put in 94 about 1/2 tank, and check for any pinging and if it does just add some race fuel but I know at best youll only need 50/50 110 or even 108 and 94.Trust me!:macho

[Steve-o 400EX]

Originally posted by 400-416EX
If atll possible mix c-12 with 93-94 octane and you will be fine. I usally mix 50-50 on my 416

Exactly.....

First of all, if you put 87 ocante in your quad your a complete moron anyway. When you do any type of motor work to an air cooled motor you should run some type of race mix because the lead in the race fuel helps keep the motor cooler. I wont run anything less than 94 in my quad and even with that in there it pings if half of you even know what that is.

quote:
--------------------------------------------------------------------------------
Originally posted by LTZ400rider
why the hell would u need race gas for that. my z400 is like 11.3:1 stock and i only need 87 octane
--------------------------------------------------------------------------------
Apparently you have no idea what the hell you are talking about,
read a 400ex owners manual and you will see that on the stock 400ex you should run no less than 94 octane.

And waht the hell would you know anyways, you have a z400.

Go find a non honda website to post you know it all BS on!!!!!!

[400-416EX]

Good answer

[nhs333x2]

Don't get over excited, liquid cooled quads are able to run lower octane becuse it burns more efficiantly than it would in an air cooled motor. The better the fuel burns the cooler the bike can run, or to say the higher the octane the less chance of premature combustion hence it would run better. Thats why the ex needs to run on high and the z can run lower octane. As for the 450, you should be able to get away with 94 without a problem.

[Steve-o 400EX]

Originally posted by nhs333x2
Don't get over excited, liquid cooled quads are able to run lower octane becuse it burns more efficiantly than it would in an air cooled motor. The better the fuel burns the cooler the bike can run, or to say the higher the octane the less chance of premature combustion hence it would run better. Thats why the ex needs to run on high and the z can run lower octane. As for the 450, you should be able to get away with 94 without a problem.

This is true....... BUT-

He is answering an EX question with Z info.....

THIS IS NOT A Z FORUM... SO THE ANSWER THAT HE GAVE IS NOT CORRECT IN ANY WAY SHAPE OR FORM!

do not post unless you can give somwhat knowlagable answers!

[wiesman]

my question was about a 12:1 piston in a 450R, not an EX or Z. so please give me an answer based on what you know about the 450R.

[ibAdam]

Originally posted by Steve-o 400EX

And waht the hell would you know anyways, you have a z400.

Go find a non honda website to post you know it all BS on!!!!!!

I was just thumbing through the archives to read up info on what people are running for various quads (mine is a stock 400EX) when I found this thread. Funny to see someone bash another when they too aren't reading or providing all the facts. But this leads me to ask an additional question. Is it just the fact that one motor has liquid cooling that it allows it to run a lower octane? Because stock race motorcycles with a stock compression of 12.4:1 (Yamaha R6 which is liquid cooled) are running the suggested 91 octane and they operate on it without issue. Here in California the gas at the pump is 87, 89 or 91.

[ckasper18]

just run 90 and add sone octane boost to it just a couple of drops .Or stash a gas gan in the woods the dyt before

Originally posted by Steve-o 400EX
This is true....... BUT-

He is answering an EX question with Z info.....

THIS IS NOT A Z FORUM... SO THE ANSWER THAT HE GAVE IS NOT CORRECT IN ANY WAY SHAPE OR FORM!

do not post unless you can give somwhat knowlagable answers!

Its not an ex forum either, buddy!

[smith_400ex_213]

Originally posted by ckasper18
just run 90 and add sone octane boost to it just a couple of drops .Or stash a gas gan in the woods the dyt before


dont run octane booster....ur better off just buying some race fuel adn mixing 1/2 adn 1/2...octane boost burns way too hot....IMO