100 octane fuel

**MSTRS:Me** · 8th July 2005, 15:29

What's the grip with this? A BP stn here has got a pump installed on their forecourt, dispensing Racing Fuel 100 octane & a sign up saying it is leaded & is NOT to be used on the road. $1.90 a litre. Shoud I try this in my RD50 bucket?

**bugjuice** · 8th July 2005, 15:41

there's a gas station in Puke that sells 103 at $1.95. They told me it was 'off' AvGas.. Haven't tried it tho

**SpankMe** · 8th July 2005, 15:59

I always fill up with avgas when I go to Puke. Don’t know if it makes any difference, but it certainly didn’t hurt. My sv650 wouldn't run on standard octane after I jetted it. Had to be at least 98 for it to run.

**vifferman** · 8th July 2005, 16:00

Originally Posted by bugjuice

there's a gas station in Puke that sells 103 at $1.95. They told me it was 'off' AvGas.. Haven't tried it tho

I don't think it would taste any better than any other petrol.

**skidz** · 8th July 2005, 16:20

I used to put 50/50 octain/91 in my old sporty and it went like a power of shit. It even had nice light grey pipes.

**Drunken Monkey** · 8th July 2005, 16:31

I agree with Spank. Put that pump racegas in every time I go there. Smells the money. Great placebo effect - I feel like I'm going faster, and that's all that counts.

**dangerous** · 8th July 2005, 18:48

buck fifity down here........ the differance with 'race fuel' and 'avgas' is race fuel is expired avgas, no good for aircraft anymore but fine in the bike.
The servo i go to has avgas (mate fills it for them direct from airport) IMO it gives a smoother and more powerfull mid range, but hardley worth the extra cost on the road.

**DingDong** · 8th July 2005, 18:55

Some machines develop a flat spot running 100, I (like skid) ran a 50/50 mix of 100 and 91 you'll need to see what suits your bike... dont mix with 96 because its octane fluxuates more than 91.(AV gas is 100 octane on the button)

You should notice the power will peak alot higher, so unless your nuts out flapping in the wind... all you'll do is foul the plugs.

I have never run AV in a 2stroke... but I have tried running ethinol (sp?) it was fast... but not for long it ran too hot.

For a bucket racer, id say have a go... you'll need every ounce you can get

Good luck

**Ixion** · 8th July 2005, 20:55

Originally Posted by wayne kohi

..

I have never run AV in a 2stroke... but I have tried running ethinol (sp?) it was fast... but not for long it ran too hot.

..

That's where you need Castrol M in the petroil

**GNR** · 8th July 2005, 20:58

avgas has real strict quiality control, so what dagerous says, prob sounds spot on

**ZorsT** · 8th July 2005, 21:15

Originally Posted by wayne kohi

I have never run AV in a 2stroke... but I have tried running ethinol (sp?) it was fast... but not for long it ran too hot.

i thought that ethanol burnt colder than petrol?

**speedpro** · 8th July 2005, 21:51

Originally Posted by Ixion

That's where you need Castrol M in the petroil

Actually if it was hot it MUST have been jetted lean. Methanol in a 2-stroke is magic as it cools the crankcases nicely due to latent heat of evaporation. I've used Castrol MSSR in Methanol in a 2-stroke but that was years ago.

**speedpro** · 8th July 2005, 21:54

Getting back to the original 100 octane in the 2-stroke thing - to get any real advantage you need to raise the compression LOTS. My 100cc Honda is over 15:1 and it barks (but isn't a dog, OK). It would last about 5 seconds on 96/91.

**unhingedlizard** · 8th July 2005, 22:42

we put meth in a scooter once, bloody thing wouldnt go slower that 10kph.
I tried avgas striaght from the pumps at param when i was training there. You need to sign a note to say your not using it on the road. Put it in a 1994 GSXR400 and got no difference what so ever. I would imagine that if your bike was tuned to it it would work well, but a nice set of pipes would probably work better.