Do and donts of petrol..

[Lord Derosso]

So we have all sorts of fancy names for petrol nowadays such as Techron95, Ultra95 etc etc. What is best for the average 4 cyclinder jap bike like my GXS600F? I was told just to use 95, which was my first idea anyway, but suspect that she may run better on different ones though I am not sure if petrol designed for lower reving car engines is better for the bike using the fancy named addatives. In the past I use to just get Super from the old BP and that was it for all my bikes, but its been a few years since I have been riding and I am not up to date with events. Accordingly, I would love any and many comments on what and why - the petrol you use for your pride and joy, or are you convinced that all petrol is equal?? Is there any one station in central Wellington any local would recommend? Sounds silly? If you live in the countryside some garages have old ground tanks and water etc in the fuel makes for a very sick bike...........

[sprocket]

Ha funny i was gonna post the exact question

But i would like to add do you need to have your bike tuned for specific fuels?
ie: if you run 91 and switch to 98 i have heard of ocasions of bikes running like dogs? not so much fuel injected bikes more so carby bikes can someone pls spread some more light on the issue?

[Storm]

On another note, what sort of fuel would be the go for a small single?
(Not everyone has a massive gixxer/ kawa/yammie/honda firebreathing 1000cc y'know)
Is it related to compression ratio or what?

[Edbear]

Your bike will run best on whichever fuel it's tuned to. My 'F' runs best on 91, I tried 95 but it didn't like it. I could tune for it, but it goes like stink as it is. Some with computer controlled injection may automatically remap the tuning for whichever fuel you put in it,as our Nissan Pulsar does and it runs noticeably better on higher octane. Not certain if this is true of bikes though, perhaps a techie can enlighten us on this.

[sunhuntin]

did consider trying the 95/98 in scuffy....but the price shot too high to allow for an experiment that would likely fail! LOL.

[Bonez]

On another note, what sort of fuel would be the go for a small single?
(Not everyone has a massive gixxer/ kawa/yammie/honda firebreathing 1000cc y'know)
Is it related to compression ratio or what?

I use 91 in the GB400, in fact in all my old girls, only GasAxe pings under load. All of them seem to reach there original specified top speeds/maximum ranges ok using 91. Don't see any point in paying extra for naff all.

Totally unscientific of course. But 91 "just works" for me.

Your Goose seemed to trot along ok on that Taupo run.

[Storm]

Thats cos I was in your slipstream. Personnaly I've never noticed any difference between 91 and 95, altough I run some 98 if I'm feeling rich on the basis that it'll burn hotter and clean out the built up scunge. Is this true or did someone give me the wrong idea?

Also, theres always room for a bit more speed in the trotting dept

[Oakie]

When I bought my bike the mechanic at the shop told me to run it on 95 as '91' doesn't necessarily have a 91 octane rating. '91' is just like a trade name for a fuel of around about 91 but may be a little less. He said they put '95' in all their bikes.

[Bonez]

Thats cos I was in your slipstream. Personnaly I've never noticed any difference between 91 and 95, altough I run some 98 if I'm feeling rich on the basis that it'll burn hotter and clean out the built up scunge. Is this true or did someone give me the wrong idea?

Also, theres always room for a bit more speed in the trotting dept

What does the exhaust oulet look like running on 91 after a long ride?

[sprocket]

When I bought my bike the mechanic at the shop told me to run it on 95 as '91' doesn't necessarily have a 91 octane rating. '91' is just like a trade name for a fuel of around about 91 but may be a little less. He said they put '95' in all their bikes.

I have read that 96(95 now ) can have a lower octane rating than 91 for the simple facts that the aromatics in it are so unstable, so the fuel goes off faster so, I perfer 91 over 96, however 98 is imo a far more advanced, fuel its guarenteed min 97.5 from the pump, takes longer to go stale , is better for your engine , and well comming from a modified cage which ran on nothing but 98 I dont understand why you wouldn't use it ? I dont like it when ppl use cost as an excuse when it costs me over a hundy to fill my caldina on 98 surely $30 of 98 for a bike is very reasonable?

pls correct me if im wrong but most jap import bikes are already tuned to run a higher octane, are they not ? seeing as japan use 105 ron

Also i find ....well im my car anyway that i get better milage using 98 .

So is it not cheaper in the long run to retune your bike and reap the benefits over time?

Anyway what would a noob like me know ...Sheesh

[thealmightytaco]

Gotta run what the bikes made for; if it needs 91 then 95 might blow back cause it's taking too long to burn, and if it needs 95 and you run 91 then you'll overheat it and get detonation 'cause the well burnt gases are trapped in there too long.

WRX's are chronic for blowing the rear piston if you don't use 98 even, because that piston gets the last of the cooling water and always overheats.

[Storm]

What does the exhaust oulet look like running on 91 after a long ride?

Dunno, never looked. Its usual state is black soot around the arse end as far as I know

[sprocket]

WRX's are chronic for blowing the rear piston if you don't use 98 even, because that piston gets the last of the cooling water and always overheats.

Well actually its due to the poor setup in the fuel delivery system #4 leans cause its the last to get the supply hench why they go for a two rail setup when modified, lol i know cause ive dont it at meremere was an expensive lession

[VasalineWarrior]

We need Motu to add something onto this thread. Ive always gone for the ''more octane burns better=faster and better running bike'' so I justify the extra $2 this way.
Ran dirt bikes and the old cbr on 91'. Became pricks to start and idle lower.

[Titanium]

I run 98 ultimate, bike tunes for any gas I put in it but requires a minimum of 95 octane to run properly.

Also Higer octane burns slower and cooler not hotter and faster.

Peter