OzVMX Forum
Clubroom => Tech Talk => Topic started by: denidave on May 03, 2016, 12:50:04 pm
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Hi folks,
I have just bought a yz490 and having been out of the two stroke world for a while I am wondering what the best fuel to run is? unleaded of what rating such as 91-91-98 or am I better off running avgas which I have easy supply to as well?
then which premix oil is recommended to run with it and what ratio seems to be ideal...
bare in mind that price is of no argument as I only ride it when I get a chance so Id rather pay for quality if that's whats recommended.
thanks and I hope this isn't like bringing up religion or politics.... ;D
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no - but soon you will get 1 million different opinions
I run 98 Ultimate - can't get easy access to avgas and Silkolene Comp 2 Pro SX (I think its called) - basically best I can get from Silkolene. Quite a few others on the market. I run 40:1 and haven't had any dramas.
Now - let the fun begin :)
Rossco
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Fuel Consistency is paramont.
Quality
Bang for buck
Easy to manage
Mistakes and wastage don't suk up your fun tickets
BP ULTIMATE
Ticks all my boxes
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It may be a myth but I have heard BP ultimate does not mix well with 2 stroke oils.
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BP 98 blend 50/50 av gas in BSA
vintage and modern 2 strokes , have 5 running BP 98 woth Motul oil 32.1 never problem and piston and bores all ways look good
:D :D
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Any 98 octane in a big-bore 2-stroke.
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actually have been doing a bit of a back to back thingy with my V8 - and yes lots of inconsistencies in what I am looking at - but likes BP Ultimate more than Vortex 98.
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Hi folks,
I have just bought a yz490 and having been out of the two stroke world for a while I am wondering what the best fuel to run is? unleaded of what rating such as 91-91-98 or am I better off running avgas which I have easy supply to as well?
then which premix oil is recommended to run with it and what ratio seems to be ideal...
bare in mind that price is of no argument as I only ride it when I get a chance so Id rather pay for quality if that's whats recommended.
thanks and I hope this isn't like bringing up religion or politics.... ;D
Nooooo it's much worse. In the big pinger run avgas @20:1 with a castor/synthetic blend oil, unleaded needs a dedicated set up to get the most out of. Avgas will be that little bit more forgiving.
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The BEST fuel is what fuel YOUR engine is tuned for ;)
Your mates bike will like something else most likely. if you can get Avgas then tune it for avagas.
just stick lots of good quality oil in it so it wicks that heat away nice and quick.
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I have only tryed vortex 98 , so I no stuff all about this topic .
but on the flip side I've had heaps of hole shots over the years running vortex :o ;D
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I have only tryed vortex 98 , so I no stuff all about this topic .
but on the flip side I've had heaps of hole shots over the years running vortex :o ;D
So I have heard, bastardo ;D fukin Kiwis ;D Nah, good on ya Mick 8)
I hope to get back here latter, but I busy at the moment, trying to catch a cat and put him in bucket ::) ::) ::)
He's already seen the bucket and left me dripping in blood just before he was last seen :-[
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[/quote]
busy at the moment, trying to catch a cat
[/quote]
When ya catch the pesky feline mate come to my place & deal with the little bastard that keeps crapping in my garden >:( >:( >:( >:( >:( >:( >:( >:( >:(
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Hmm so I'm leaning to the avgas and 20:1, consistency in avgas is meant to be spot on. back 20 years ago we ran it with castrolR30, is that still around and a good thing or what would be the best castor based oil ?
Bike is fresh from the states and running a flatslide carb/boyesen reed block etc and had head mod and porting work. was thinking of sorting out the fuel side of things then send it down to Dave at TSP in Melbourne to tune it on the dyno, saves me a lot of mucking around as I don't get many days at home due to working away.
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few [people advocate 20:1 - others disagree??? Castrol R30 not as good as the new oils out now.
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didn't think it would be as good as the newer oils, any particular oil better on big bores than others? I see some such as motorex recommend 40:1 on 500cc bikes?
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I have a YZ 465 with the same mods done you have listed. I have run it with 98, 100 and 105 unleaded. It runs way cooler on 98 pump gas therefore giving it more power in longer motos. Its last outing on 98 was 8x10 min and 2x15 min motos with a very fast kid on it for 9 wins and a second. Running the higher octane fuels previous to this resulted in a second lap seizure and numerous run on problems. I would stick to 98 if i was you. As for oil i use Maxima 927 castor at 30:1 which smells identical to Castrol R
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I have a YZ 465 with the same mods done you have listed. I have run it with 98, 100 and 105 unleaded. It runs way cooler on 98 pump gas therefore giving it more power in longer motos. Its last outing on 98 was 8x10 min and 2x15 min motos with a very fast kid on it for 9 wins and a second. Running the higher octane fuels previous to this resulted in a second lap seizure and numerous run on problems. I would stick to 98 if i was you. As for oil i use Maxima 927 castor at 30:1 which smells identical to Castrol R
That sounds like good enough advice for me to take, Thank you kindly. the cooler running will be what I'm after as its going on rego and will be planning to do some longer rides in the bush. not flat out all the time but used for longer periods than an mxer does
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Motorex is good, silkolene is good, Bel Ray is good..........................
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I run a B8ES plug but would maybe consider a 9 for road and trail.
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Motorex, Silkolene and Bel Ray also do nothing to support VMX in Australia. Maxima do. Support the brands that support us
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I have several close friends with aircraft and can get Avgas hand over fist. Have to pay for it though, not cheap either. For a bit of fun? A trail ride. No thanks, not for me. I doubt the vast majority here could even get avgas for love or money.
BP98 is the most consistent retail bowser fuel on the market.
And I dont say this just because the Australian karting association's knowledge of that fact
(http://i677.photobucket.com/albums/vv132/mc125mick/2016-05-03_zpsdtbpxvog.png~original)
I say it from past working experience in the bulk supply oil industries, seeing how bulk fuel is handled. Once being privy to test results.
There are a hell of a lot of slops created as a result of bulk fuel transfers. See all those giant tanks when you drive by your local terminal tank farms? well at least one of those large tanks is what they call slops tanks. By federal law the companies are not supposed to blend back the slops into retail petrol at a rate of greater than 3% of delivery volume to the service stations.
Well,,,they are not supposed to ::) ::) ::) ::) ::) ::) ::)
Oh, I meant to say interface slops and mistakes and pumping brake down slops ::) ::) ::)
These interface slops are a mix of various petrols, diesel, Kerosense(Jet A1)
They cannot be blended back into diesel or jet fuel for obvious reasons.
They can only be blended back into the two lower levels of petrol, plain ULP and Premium to a lesser extent.
They are not blended into BP98.
BP98 is the most consistent retail pump fuel in Oz.
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Motorex, Silkolene and Bel Ray also do nothing to support VMX in Australia. Maxima do. Support the brands that support us
I agree Ted, it is just plain shameful and un-Australian not to support those who support us. Particularly when a local value for money choices exist.
Where will this sport be when it losses supporters like
Maico@chippys
Maxima
Prime Eight
Engineered environments
VMX mag
Graeme for this forum
Etc,
Etc,
Be grateful, support those who support the old dirt bike scene :D
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I'm an advocate of RF100 100% of the time no question.
It's readily available but you do pay good $ for it.
For me that's fine as I race dirt track so I'm not pulling 30 minute motos.
If i had to use bowser fuel I'd definitely be using BP ultimate. I have spoken directly with one of BP's petrochemical engineers who advised that BP ULTIMATE contains zero ethanol. All the other brands higher octane blends contain traces of ethanol in varying ratios.
Ethanol eats fibreglass tanks (delaminates) so I boycott the stuff like the plague!
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Talking of Maxima 927, it is the oil of choice for Go Kart engines.....and there isn't any 2 stroke engines that work harder than what they do....it is also very clean as it does not leave deposits on pistons etc. If your local supplier doesn't have it, tell them to get it in. Maxima is the #1 selling motorcycle oil in the USA. And like the boy's say, they support VMX.
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Yep, Maxima 927 and nothing else for 2 bangers in our family, big chance you may need to make jetting changes going from pump fuel to Avgas.
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Over here on this side of the island.. the Motorex dealer does a lot for the VMX scene.. don't forget there is another side to this sport over here.. :-*
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Thanks guys will go the maxima927 for sure then, always happy to support those who support vmx in any way. I'll also go the bp98 and a 9 heat range plug.
The reason I asked of the avgas is that was the hot ticket years ago and it is readily available here at the bowser for around $2.20 a litre and I usually grab a bit to put in any bikes that are sitting for longer than a month or two cos any other fuel seems to go stale in that time range.
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just to add fuel to the fire....I run motorex fully snyth at (wait for it) 80 and 100 to 1 in my 400 husky 84 and the 010 300 kato
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Ive allways run Motul 800 in all my bikes at 50:1,big or small bore with BP ultimate.
Also in all my karts at a richter ratio and never nipped or blown up.
Engines allways clean on pull down.
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Anyone know how much of our fuel is imported here in Australia?
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Anyone know how much of our fuel is imported here in Australia?
Too much of it?
"....Shell announced the closure of Sydney's Clyde refinery in 2011, and Caltex called time on Sydney's Kurnell refinery a year later. When BP announced the closure of Queensland's Bulwer Island refinery in April 2014, Australia had slashed 42 per cent of its refining capacity in the space of three years"
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Anyone know how much of our fuel is imported here in Australia?
The vast majority of it now. From Singapore, by ship.
Thank god that if our defense needs fuel to these places
(http://i677.photobucket.com/albums/vv132/mc125mick/2016-05-06_zpssjfgv6ke.png~original)
(http://i677.photobucket.com/albums/vv132/mc125mick/2016-05-06%201_zpshizlgp33.png~original)
(http://i677.photobucket.com/albums/vv132/mc125mick/2016-05-06%202_zpsdygplama.png~original)
all we have to do is clear it with our New Chinese overlord Harbour masters first.
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Thank god the Chinks have our best interests at heart ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::)
Oh that's right, they dont want to take over. They need our really tiny population to survive ::) ::) ::) ::) by marketing junk to. Looozer talk!
Yeah sure they do, a Population explosion that needs to be fed, and a D*** K**T nation who is giving away the best
farm on the planet. No sorry, not giving away, a dollar fifty and then its yours ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::) ::)
We don't need or deserve this country, so best kiss it goodbye.
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I haven't seen my Doctor for eighteen months,
Haven't spoken to my brilliant lawyer for a few months,
But yet, one person who I cannot live without at least three times a day, is my Farmer.
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I haven't seen my Doctor for eighteen months,
Haven't spoken to my brilliant lawyer for a few months,
But yet, one person who I cannot live without at least three times a day, is my Farmer.
Quote of the week!
Good one. :)
(Did you hear about the lawyer that set up shop in a small rural town? Business was almost non existent, just as he was about to give up, and shut up shop, another lawyer opened in the same town. They are both now very busy. :-\ )