My Suzy GSX

**R1** · 12th January 2005, 20:30

Originally Posted by F5 Dave

If it makes you feel better that your bike is a high performance demon machine that couldn’t possibly run on anything but the best fuel then go right ahead.

High octane gas doesn’t necessarily have a higher calorific value (that’s the amount of power that can be extracted from the gas when you burn it, assume a lot of losses when using in an internal combustion engine). The high octane gas will stave off detonation & produce more power in an engine with a high enough compression ratio &/or the timing to suit.

As most bikes are produced for the world market they assume regular unleaded petrol is to be used & the timing is fixed.

But please don’t let that stop you. Buy 98 or AvGas if you fell so inclined & twist that throttle a touch harder & 'feel' the difference. You've paid for it after all.

Why do they have 96 or 98? Some European Vehicles are tuned for such petrol. Does anyone have evidence of a Jap vehicle stating high octane gas is required? (Like in documentation not some counter guy). Maybe the turbos?

Yeah my R1 came from Oz, the owners hand book said the fuel must have a rating higher than 94oct and no greater than 102oct, and on the dyno with half a tank of avgas it makes 3hp more than shell 96oct. Im sure this has been dun to death also but a while ago i bought a tank of 96 from BP, my bike ran so bad i thought something major was up with it...until i clicked i had only just filled up from empty, so i drained the tank went and got some Shell 96 went for a ride problem solved so i took the gas fromm PB back and a week later i got an letter stating that the gas out of my tank had a rating of 88oct

but the letter also had a $50 fuel card

**Sensei** · 12th January 2005, 20:37

Woludn't have thought the different gas would have made any change to a R1 . Their slow with avgas in them

SENSEI

**Ramius** · 12th January 2005, 21:40

Originally Posted by Aaron

Two day reader, first time poster...

I've ordered my first bike, due to arrive next week (2004, GSX250) and was wondering what fuel it takes, (hadn't thought to ask the guys at the shop and was going to do so later this week

). Monsterbishi, you mention a 12.2:1 compression ratio, but on the back of the phamplet I've got it says a 10.5:1 ratio, is the latter something you'd still not run on 91?

I try to fill mine up with BP ultimate as often as I can, however, in certain places if that is not available, Caltex Vortex 96. I notice the bike likes the 98 and has smoother running.

**R1** · 12th January 2005, 21:57

Originally Posted by Sensei 509

Woludn't have thought the different gas would have made any change to a R1 . Their slow with avgas in them

SENSEI

hahahahaha, yeah it makes a hell of a differece, they end up the same speed as slow stuff like zx10's and HUMMMMM ...whats the other slow1?........gsxrthou

**avgas** · 12th January 2005, 22:11

:eyepoke:

**Bonez** · 13th January 2005, 05:14

Originally Posted by Sensei 509

Woludn't have thought the different gas would have made any change to a R1 . Their slow with avgas in them

SENSEI

Rumour has it it's not whether the bike is fast or the gas used but whether the rider can ride the fast bike fast

**mattt** · 13th January 2005, 06:24

Originally Posted by R1AaronKDX

Yeah my R1 came from Oz, the owners hand book said the fuel must have a rating higher than 94oct and no greater than 102oct, and on the dyno with half a tank of avgas it makes 3hp more than shell 96oct.

But do you notice the 3hp gain when riding on your limit of 5000rpm?

**manuboy** · 13th January 2005, 07:25

to be fair it doesn't really matter whether he notices it or not. He's stating that he has a measured increase in power using the higher octane aye.

To be fair also i was running 96 and then swapped to 91 after Magpie Madness and haven't noticed a thing in day to day terms except my pipe ends are cleaner.

**Aaron** · 13th January 2005, 07:30

Originally Posted by Ramius

I try to fill mine up with BP ultimate as often as I can, however, in certain places if that is not available, Caltex Vortex 96. I notice the bike likes the 98 and has smoother running.

Thanks Ramius

**Sensei** · 13th January 2005, 16:00

Originally Posted by Bonez

Rumour has it it's not whether the bike is fast or the gas used but whether the rider can ride the fast bike fast

Sorry to dissapoint but thats why I brought the bike

SENSEI

**dangerous** · 13th January 2005, 16:28

Originally Posted by manuboy

I was running 96 and then swapped to 91 after Magpie Madness and haven't noticed a thing in day to day terms except my pipe ends are cleaner.

Thats because they are the same fuel.... however 96 has more of the benzine and other shit in it that destroys the internals of our engines, all just so we can have 5oct more..... and at a price I might add.
We may be ment to use 96 but infact most engines will run worse off because of the added crap, personly I use 91 reguardles

**stify** · 14th January 2005, 11:35

Oh, and one other thing, I noticed that when driving at low speeds I can hear a whirring sound as if the break was engaged, and it feels like the bike is towing something...

had a gsx for 6000k or so,after clowns did first service adjusted chain toooo
tight started to wuuurrrrwuuurrr at anything less than full throttle(most of the
time this was required to git it movin with me fat butt an all)
readjusted but damage done already,still did 4000kms without any change
(noise worse when fuel tank level low also)and found ran better on 98
as performance dropped off when on 91/96 after 100ks or so when hot.