Can I change fuel to different octane?

[BMWST?]

in my experience you will get slightly better ecconomy on the higher octane fuels,probaly enough to offset the cost difference.

[nzspokes]

Stick to what the manual says. Ive read from overseas my Hornet is set to run on 87 best. So it gets 91. I keep away from Gull and Mobil 91 due to Ethanol.

My car gets much better mileage out of 98 and it works out cheaper to run it on that.

Main thing on 250 Hyobags is to not let the oil get down or they blow the bottom end.

[skippa1]

Stick to what the manual says. Ive read from overseas my Hornet is set to run on 87 best. So it gets 91. I keep away from Gull and Mobil 91 due to Ethanol.

My car gets much better mileage out of 98 and it works out cheaper to run it on that.

Main thing on 250 Hyobags is to not let the oil get down or they blow the bottom end.

Might have to get me one of those Hyobags, I could do with something to blow my bottom end

[nzspokes]

Might have to get me one of those Hyobags, I could do with something to blow my bottom end

Shame its not in a fun way then.

[EJK]

Put diesel. It's much cheaper.

[ducatilover]

Stick to what the manual says. Ive read from overseas my Hornet is set to run on 87 best. So it gets 91. I keep away from Gull and Mobil 91 due to Ethanol.

.

You may find our octane ratings are a wee bit different from overseas ones? Not sure what the figures are, but it'll be chur on 91.
My shitheap gets 98, but it needs it. Cage gets left over 98 from the rally car, not allowed the avgas from the track car but it wouldn't do anything except turn the pipe grey...

[nzspokes]

You may find our octane ratings are a wee bit different from overseas ones? Not sure what the figures are, but it'll be chur on 91.
My shitheap gets 98, but it needs it. Cage gets left over 98 from the rally car, not allowed the avgas from the track car but it wouldn't do anything except turn the pipe grey...

They run rich as shit anyway, I ran it on 98 once and it ran like poo's.

[ducatilover]

They run rich as shit anyway, I ran it on 98 once and it ran like poo's.

I've never been a fan of poo.

[Taxythingy]

91. My carby 2007 runs just fine*, idle to redline and WFO.

*excluding the rattle from the exhaust.

[strandedinnz]

Just to thrown in some pesky facts in to the conversation

There are different measurements of "octane", here in NZ the pumps advertise using RON, over in the US they advertise on the pump using (RON + MON)/2

So if you get a US bike and it says in the US manual it needs to run on 91 "octane", and you bring that bike over to NZ you should not put in 91, you should be putting in 95/98.

Same goes if you buy an NZ bike, go online for a user manual to find out what fuel you want .. make sure the manual is an NZ/AU print and not the US one and that it defines what "octane" they are referring too.

For all sorts of fun facts about octane ratings go to Wikipedia, it explains it better than me

[russd7]

Just to thrown in some pesky facts in to the conversation

There are different measurements of "octane", here in NZ the pumps advertise using RON, over in the US they advertise on the pump using (RON + MON)/2

so im guessing we just use the lateRON method and the yanks use the lateRON method but maybe MONday

[Tigadee]

I've heard that the 91 tank at the refinery contains all the gunk from when they flush the pipelines transporting different fuels, anything from diesel to LPG?

Was shown two cylinders from two engines here, both same age: one ran on 91 and the other on 95/98. The one that ran on 91 was black and the other was only mildly coloured.

Even if the manual says you can run 91, that isn't an absolute [more of a minimum, as other countries can have lower octane fuels available, like 88) and you can still run a higher octane fuel if you wish. You may not notice a difference but the engine will!

[ellipsis]

I've heard that the 91 tank at the refinery contains all the gunk from when they flush the pipelines transporting different fuels from diesel to LPG?

...I bet the ratio of how much other stuff is allowed to 'blend' with the cheap shit fuel here hasn't changed...any residual spirits in the pipeline could be let into the lesser grade fuel...or the fuel could be dropped straight into the big holding tanks that may have had 10 to 20,000 gallons of other spirit left from prior use...the stuff that went into the lesser fuel could have been anything from turps, white spirits, kerosene, and any number of chemicals that had some kind of flash point...I've always been wary of the lesser octane stuff...