The search nazis will tell you to do just that.

And I am sure there are people that would tell you it's not worth it, but I know that if I ever put anything less than 93 in my Acura RSX Type-S it knocks like crazy. The same thing will happen if you run less than 89 in the 675.

The lower the octane the less gas that can be compressed before igniting. (When this happens it causes knocking)

93 octane FTW

 

I know that if I ever put anything less than 93 in my Acura RSX Type-S it knocks like crazy. The same thing will happen if you run less than 89 in the 675.

Total BS :laugh:

I am been running my D675 on 88 Octane in Florida without any issues. I have ran 89 too, see no difference. I might even go to 87 and see if it knocks. Gas went up 20cents/gallon today, I spend enough already.

You don't need to waste your money on expensive fuel if the bike is not tuned for it.

Here are my stats.

http://www.perrysys.com/Street675/Daytona675.htm

 

87 is not only cheaper, but contains less greenhugger ethanol (octane booster), so 87 is less corrosive and has higher energy density...

 

I would normally run 91 octane in CA, but since 91 octane has sky rocketed an average of 4.20 a gallon, I bumped down to 89 octane because it was 3.89/gallon at a station I stopped at to fill up today...plus the owners manual says its okay. I think from now on Im going to run 89.

I'm not sure if I want to run 87 octane....I do redline it at times.

 

I run 95. That's the minimum my manual recommends so I don't know what you guys are on about, unless you guys have different rating system. Are we talking unleaded?

 

octane

In Australia we have Unleaded 95 or Premium Unleaded 98, I have never seen a pump below 95 octane. So I run 98 octane.

 

Yeah, in NZ we have unleaded 91, 95 and in some places 98. I've been thinking about switching to 98. just to squeeze that extra bit out of the bike.

 

We have 95 and 97 at every station, so i use 97 all the time.

 

89 is just fine, no need to run anything higher. I actually found that my bike was running a little on the rich side using 93 octane.

 

Me too. I run 89 all the time.

 

In Switzerland, we have 95 and 98, nothing below. I use 95.

 

i run the high ocatne stuff...around 97
i would advise that you stick to one octane rating and try and stick to it. i know the bike can switch around to different types but i reckon they prefer to be run on the same type

 

makes you think

we only seem to be running higher octanes in europe wonder if this is contributing to some of the strange engine noises some are people are getting ie knocking replies please

 

Service manual recommends unleaded 89 or higher for the USA. If I remember correctly, they recommend a higher octance for England/Europe.

 

We Americans tend to forget that the whole world does't dance with the same shoes :smile:

Yes, Octane rating in different countries are not the same (or even parts of the country).

http://en.wikipedia.org/wiki/Octane_rating

Here in Florida, the most common rates are 87,89 & 93, but there are a few stations (7-11/Citgo) that have 5 grades 88,88,89,91,93.

In high altitude (like Colorado), the ratings are about 2 lower, like 85, 87 & 91 or something like.

The owner's manual (at least the version I have) states 89, which is generally middle grade here in the US and would probably equate to a middle grade anywhere else too :sifone:

One of these days we will all be riding on the same side of the road and talking the same language :rofl2:

 

One of these days we will all be riding on the same side of the road and talking the same language :rofl2:

We've been waiting for you guys for ages

 

I've been running 92-93 octane since new. I read another thread here about gas prices and someone commented about 93 being harder to ignite , will rob your bike of power etc. and it wasnt worth the money etc.etc. So when I filled up I went with 89 to see what it would do. No knocks, no pings, Took off from a light chasing a friend on an Aprilia RSVR 1000 and I carried the front for about 50 feet, hit second and she came up again!!! This is only my 2 cents, but I seem to have gained a bit from this little test?

 

my friend put diesel in his cbr one time. i asked him why he was using diesel half way through him filling up. he pretty much started to cry. about 30 minutes later and 3 feet of hose he had sucked it all out. 2 gallons of diesel in the mouth later he barfed. bawhahahaha

 

That's hilarious!

My stepmother once borrowed a gas converted diesel car from a friend and not knowing filled it with diesel. Then thought the car was possessed when it wouldn't stop running when she turned it off.

 

95 all the way. We can't buy any lower grade. I alternate supermarket fuel with BP or Shell to make sure that the cheaper fuel doesn't cause any residues.

 

i run it on chuck norris's tears.

 

Chuck Norris doesn't cry!!! I hope you didn't pay too much for it cause it aint real!:snack:

 

89 here... 93 on a trackday maybe.

 

Oh my GAWD

Every motorcycle forum goes through the "Which Octane Should I Use" thread periodically, and I feel the need to clear up a few mysteries and myths. Observe:

1) As stated above, octane is figured differently in the States as opposed to the rest of the world.

2) Octane in a measure of the fuel's resistance to ingniting under compression, all other things being equal. Changes in altitude, humidity, and temperature can affect this. Igniting under compression causes pinging, which is BAD.

3) High performance engines usually have higher compression ratios, requiring higher octanes.

4) Octane is NOT a measure of power delivery, as the gas stations would have you believe. See #2.

5) Higher octane fuels also tend to burn slightly slower, which can rob a high-revving engine of power.

In summary: Use the lowest octane fuel you can that doesn't cause your engine to ping. Higher octane fuel is simply a waste of money. Following the recommendation of the manufacturer will not lead you astray.

 

I've routinely ran 87 on my other bike and found there's no difference in performance. If it isn't pinging or knocking, a lower octane fuel is sufficient. Every brand of fuel has their own mix of gas and the octane is computed using the (R+M)/2 formula. If other 675 owners use 87 and do not have knocking(pre-ignition) problems...I think 87 will suffice.

This is only a guess, but the on-board computer may also be smart enough to delay/retard the spark if it senses knocking or pre-ignition. That's strictly knock caused by a spark timing issue. The thing that can't be stopped by the computer is fuel/air mixture igniting from purely compression alone. I don't think this would occur as it hadn't occured in the past with I4 engines that have a higher compression ratio than the 675.

Owners using 87 on a steady basis please chime in on your experience using 87 octane fuel.

Every motorcycle forum goes through the "Which Octane Should I Use" thread periodically, and I feel the need to clear up a few mysteries and myths. Observe:

1) As stated above, octane is figured differently in the States as opposed to the rest of the world.

2) Octane in a measure of the fuel's resistance to ingniting under compression, all other things being equal. Changes in altitude, humidity, and temperature can affect this. Igniting under compression causes pinging, which is BAD.

3) High performance engines usually have higher compression ratios, requiring higher octanes.

4) Octane is NOT a measure of power delivery, as the gas stations would have you believe. See #2.

5) Higher octane fuels also tend to burn slightly slower, which can rob a high-revving engine of power.

In summary: Use the lowest octane fuel you can that doesn't cause your engine to ping. Higher octane fuel is simply a waste of money. Following the recommendation of the manufacturer will not lead you astray.

 

Must admit I was living under a misconception about octane ratings. I knew about 2 and 3 but didn't know about 5. Thanks.

 

Howcome they use octane thats rated like 103 or at least over the 100 mark on tracks and stuff?

 

engines with higher compression ratios or turbocharged cars require higher octane to reduce premature detonation (aka knock/ping). when you use lower than recommended fuel timing is usually pulled to prevent knock. using 103 or 110 allows you to run more timing (closer to tdc) because knock is reduced getting more power out of the piston stroke.

 

They burn alcohol too, but their engines are designed specifically for the fuel they are running.

 

I see, cheers for the info!

 

Yeap, Octane listings do vary between the States and the Rest of the World.

I also laugh at the way Petrol companies market to people giving them a false sense of bigger dick syndrom if you go out and buy the more expensive "higher" octane rated fuels.

Stay away from anything that uses Ethanol blended in their fuel. Unless you are running a tuned high compression engine, the lowest octane fuel you can get should be fine. Again, common sense prevails and just listen for the ping.

I use 93 in AUS for my CBR1KRR and notice a few things:
Cooler running
Smoother in the lower revs
Cheaper

 

89 with 10% ethanol with few exceptions of 91. 3800 miles not a problem thus far.