Oil-to-gas ratio?

**camchain** · 24th August 2009, 13:15

EXC200 @ 45:1 - but oil amount is auto-increasing due to month-old evaporating stale gas.

**IIIRII** · 24th August 2009, 15:20

I would love to know the rationalle for using 50/50 avi and 91 or 50/50 avi and 96
please explain
Ta

**bogan** · 24th August 2009, 15:29

32:1 95 to motul hardout stuff, 98 CR125.

**B0000M** · 24th August 2009, 15:52

Originally Posted by IIIRII

I would love to know the rationalle for using 50/50 avi and 91 or 50/50 avi and 96
please explain
Ta

me too. to me this makes for 97.5 octane 50% unleaded.... why not just buy 98?

**tommorth** · 24th August 2009, 20:21

ktm200 32:1 tts and whatever gas is handy

**vanmajor** · 24th August 2009, 20:24

2009 KTM 250SX - 40:1 Motul 800 + 98 octane.

**scott411** · 24th August 2009, 20:30

Originally Posted by IIIRII

I would love to know the rationalle for using 50/50 avi and 91 or 50/50 avi and 96
please explain
Ta

the reason i run avgas mix is,

two strokes like leaded fuel, it prevents detonation,
it is not really about octane,
however avgas burns slow, thats why we mix it, i use 91 because there is not a lot of difference between that and 95 and its cheaper,
i run std 2 strokes on 95, but i have put a bit more compression into my 125 thats why i run avgas, more for safety,

modern 4 strokes do not like or need avgas, i run 98 when i ride these

also avgas is very consistant, where pump fuel is not,

**flyingcr250** · 24th August 2009, 20:34

Originally Posted by scott411

the reason i run avgas mix is,

two strokes like leaded fuel, it prevents detonation,
it is not really about octane,
however avgas burns slow, thats why we mix it, i use 91 because there is not a lot of difference between that and 95 and its cheaper,
i run std 2 strokes on 95, but i have put a bit more compression into my 125 thats why i run avgas, more for safety,

modern 4 strokes do not like or need avgas, i run 98 when i ride these

also avgas is very consistant, where pump fuel is not,

whats the mixture in the race fuel sold at the kumeu bp?

**scott411** · 24th August 2009, 21:11

no idea sorry, i get mine from challange pukekohe, which is just avgas,

**cheese** · 24th August 2009, 22:39

Interesting. Along teh lines of getting your 2 smoker to smell with that lovely castor smell, can I just get castor oil to add? or just use R30? they ran out at supercheap...

**Paulus** · 24th August 2009, 22:45

Okay, so wandering off topic a bit here - someone once told me that avgas had a number of additives to help it burn at high altitudes and low temperatures and that it was unsuited to use in motorcycle engines. No 1 racing was supposedly a different mix (used to be able to get it at a pump at the local gas station) and was designed for use in said engines. This may be rubbish. Does anyone know?

Back on topic: 07 Husky WR250, 40:1 Castrol TTS, 95 octane pump gas.

**IIIRII** · 25th August 2009, 18:10

I could explain but I cant type for shit so read this

http://www.csgnetwork.com/jetfuel.html

**barty5** · 25th August 2009, 18:23

Originally Posted by IIIRII

I could explain but I cant type for shit so read this

http://www.csgnetwork.com/jetfuel.html

thats all bout jet kero fuel

**tommorth** · 25th August 2009, 18:37

Originally Posted by flyingcr250

whats the mixture in the race fuel sold at the kumeu bp?

its pretty high my kdx used to love that stuff can't remember th octane rating pretty sure its written on the pump it was 3 bucks a litre last time I got some though

**theblacksmith** · 25th August 2009, 19:37

KDX250 - 95 fuel 32-1 ratio

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