Best FUEL for our bikes...

[RØKSTA]

So, debating time, possibly.


....Whats the BEST fuel for our 4 stroke off road bikes?

Should we be running the highest octane we can in our jap bikes?

OR

Does it matter?

How about for our 2 Stroke Friends???


Enlighten us all


// Rob

[little.whittle]

I normaly run 98 in mine... Never ever have fouled a plug :msn-wink:

I know someone whos bike used to foul plugs and he was told to rune half race gas and half 95-98..... He now doesnt foul plugs :niceone:


I would use 98 in all :2thumbsup

[RØKSTA]

So BP Ultimate 98 in a 4 Stroke would be sweeeeet?

[little.whittle]

yeeeeess think it would be the best

[RØKSTA]

yeeeeess think it would be the best

MEAN Sorted

So can people with bumble bee bikes still buy high octane av gas from Kumeu BP?

[p.dath]

This has been discussed quite a bit before. Unless you engine has been turned for a higher octane fuel like 98, it's not likely to make that much difference.

Perhaps you could fill in your bike in your profile so we new what you had ...

Using 98 is like giving a lot of extra money to the oil companies for something your most likely going to need a stop watch to be able to detect the difference with.

[little.whittle]

This has been discussed quite a bit before. Unless you engine has been turned for a higher octane fuel like 98, it's not likely to make that much difference.

Perhaps you could fill in your bike in your profile so we new what you had ...

Using 98 is like giving a lot of extra money to the oil companies for something your most likely going to need a stop watch to be able to detect the difference with.

KTMs are all ment to be run on hi octane fuel as to the modern race bike.. Bikes such as DR-Z's shouldnt be too much afected by what fuel you put in.
A lil off topic but in modern cars you can notice a huge differce in what fuel goes in.. Especialy the smaller ones

[BASS-TREBLE]

I've experienced higher mileage with 98 and 95. On the FZR that is

[RØKSTA]

In my VY Holden you can def tell the diff between regular shitty 91 and BP ultimate 98.

Oh yea, I have a bike now, YAY I can fill in that part.

[vtec]

It's a fair question.

My Honda Prelude vtec gets a loss of power and idles a little low when I put 91 octane in it. So I run at least 95 octane in it, to prevent any damage.

However, my CBR250RR used to run more powerfully and smoother on 91, as that is what it was designed to run on.

My 600cc race bikes and anything high performance and reasonably big seems to favour higher octane.

So unless you've modified your engine, I would stick to the engineer's specifications. I think you can safely say with a big reasonably slow revving 4 stroke single that 98 will be suitable. You don't really want detonation, and they are very high performance engines straight out of the factory. I wouldn't run 91 in one of those bikes... This is advice from someone who doesn't really know and has never run a motard or a 4 stroke dirt bike.

[tommorth]

I got some of that race gas from kumeu about a year ago bike ran very very well on it but at $3.50 a litre I don't bother very often bike still goes faster than me on 95 or 98

[RØKSTA]

I got some of that race gas from kumeu about a year ago bike ran very very well on it but at $3.50 a litre I don't bother very often bike still goes faster than me on 95 or 98

Wow didnt know it was that expensive, never bought the stuff!!! Cool tho!

[K6K]

the higher the octane rating the less likely it is to detonate under compression (knock) higher compression engines need the high octane fuels. Cars have knock sensors which retard the timing (reducing the power) if knocking is detected but I'm not sure about modern 4T dirt bikes.

[barty5]

MEAN Sorted

So can people with bumble bee bikes still buy high octane av gas from Kumeu BP?

yes you can still get it at the BP there use to be a car rental place on the corner of sunnybrae rd and parity pl that sold it as well havnt been there in last year or so thay may still do it

[IIIRII]

Like others have said, there will be no noticable power gain going from 96 to 98 unless you alter the timing but it could run smoother at idle.
If the engine has a lowish c/r it will run better on lower octane, exactly like a car engine.
The higher the octane rating the slower it will burn / which is why you need a HIGHER compression ratio
No amount of higher octane fuel will make it produce more power using the factory ecu.
Remember though that ron and mon octane ratings are different / so USA fuel specs for you bike may not actually be what we have in NZ etc:
90 mon = 98 ron etc:
My car makes about 100hp more at the wheels on 98 than it does on 96 but thats after a remap to suit.
Theres lots of ways of raising octane rating including mixes with avi and adding tolulene.

[B0000M]

from mine and others's experience, cr250s will detonate and fuck top ends if run on lower than 98

[t3mp0r4ry nzr]

on advice of a NZ 2T tuning guru, Im running half aviation gas and half 95 octane. I use the av gas for insurance against knock. It has been noted that most 2T's are marginal on our pump gas. Adding touluene (spelling??) at 5% mix was recommended to speed up the burn, but dont know where to source this. Anyone???

Cant beat the smell of av mixed with 2T!

On a 4T, I wouldnt run anything less than 98. Our fuels have the reputation for being crap, so I would pay an extra $2 to get the good stuff - cheap insurance against knock.

[scott411]

i run 91/av 50/50 in my 2 stroke race bikes, but i know alot of guys run 98 as well with no problems, you do have to be a bit more carefull with jetting and detonation on 98,

modern hi revving hi comopression (250/250F's) fourstrokes, 98 only,

[IIIRII]

Industrial Chemicals Ltd
Penrose

[vazza]

I know Chris Power only runs 91 in his CRF...

I run gull 98 in my 2T

[Sidewinder]

put meths through some bread and them drink it and go blind:beer::beer::beer:

[tommorth]

I know Chris Power only runs 91 in his CRF...

I run gull 98 in my 2T

isn't the gull 98 an ethanol blend?

[vazza]

isn't the gull 98 an ethanol blend?

No idea. Is that a bad thing? lol

[browny]

apparantly european fuels are far better quality than our shitty stuff,and my bike being from that neck of the woods is meant to run on98 or higher.so i mix av and 95 (our local servo's dont have 98)to get it about right, as some others have mentioned doing.i have found tho it wont idle on straight av gas???? and seems to run fine on straight 95 or even 91 if im really stuck for fuel.

[camchain]

No idea. Is that a bad thing? lol

I heard Gull is ethanol blend as well. Told this by a guy who swears black and blue it seized his chainsaw. I'm not convinced but playing it safe anyway!

Talking about av gas, mate reckons it's faster burning, I thought slower burn was better - more 'oomph' (for want of a better term).

I heard our fuel is pretty good quality. It's the American fuel that isn't too flash, something need to consider when trawling any US jetting threads.

[paddy]

Talking about av gas, mate reckons it's faster burning, I thought slower burn was better - more 'oomph' (for want of a better term).

* Higher octane = slower flame-front (slower burn).
* Slower flame-front permits higher compression before detonation.
* Higher compression yields greater power output.

[tnarg]

Gull does have small amount of ethanol in there petrol. There was a website up with the list of what car/bikes couldn't use it and it was most bikes. So I wouldnt touch it. I normally run BP 98.

[tommorth]

think the ethanol can eat some sorts of rubber
I think (but am not !00% sure)that it has a lower output for volume like lpg so you need more of it to make the same power , our old bikes used to go great when we put a little meths in the mix possibly didin't do them any good though :lol:


had a look on the gull site and its both there higher octane fuels are 10% ethanol

[Fluffy Cat]

It all depends on how the motors compression and timing advance are designed. Also with 2/strokes shape of squish band. Just run what your maker states.
High octane just burns cooler/slower and so is used in motors 4/stroke wise with higher comp. Most modern vehicles are using optimised ignition loops so run higher octane. Hope it helps.

[RØKSTA]

Just dont get your gas from the G.A.S store at Waitoki if your near woodhill, water in the tanks.... same prob that Caltex Dairy Flat had a few years back

[driftn]

My bike is tuned to run 91/avgas. But seeing as how av is a bit trickyer to get than pump I just run it on 98. seems to go alright. After this ride and it gets a rebuild ill stock up on the race stuff as the old owner said it goes mental on.