many use full synthetics on their rincons... broken in or not... with good results... I use the honda HP4 synthetic...but many use Rotella T synthetic...a word of caution on the oils thing... I used Castrol Syntec once... and I should mention that when I moved to synthetic, it was like installing a shift kit.. when it shifts its hard and positive... very cool... but anyway, back to my story... as Im sure your aware, you are not to use oil labled as "Energy Conserving" in the API circle ... so I bought castrol syntec 5W50 or some thing or other, anyway.. I changed the oil, and ran the machine... in no time at all, say about 100 miles or so... the transmission started slip like a sonofabitch... so I drained the oil... and holy shit, it was thiner then alcahol... I couldnt believe that the oil had sheard so quickly... so.. I emailed Castrol ... I posted their response to the forum a way back when, you might try searching for it... the point Im making here is this...an oil rated for automotive use may not stand up to the beating of a 4 stroke ATV engine and its rider...
now your thing of mixing aviation fuel... well, all I have access to is Jet-A1, wich is diesel... so I cant imagine wanting to run that in the machine... if you realy want to get some performance get yourself a gallon of RC engine fuel... thats Nitromethane... about 5 ounces in your tank and you will feel it...be carefull tho, it is corrosive and you will run hotter... some octane boost may be a good addition...
fuel stabalizer along with a touch of gasline antifreeze is what I use year round... the methyl alcahol keeps any water in suspension so it runs straight through, and the fuel stabalizer is just a good measure additive... it will stop that green sludge from forming whilst its sitting... In canada, our fuel is considered "old gas" at 5 weeks...
as far as hard starting goes...at -30C its a bitch... having access to a heater is nice, but when you've spent the night in the bush.. unless youve gotten up every hour or so and started the machine for 15 to 20 minutes.. your going to have to learn how its done...
here is the frozen prairie secret to starting any small motor at -25C or more... on an ATV this is typically a two person job... and you had better have a good battery....
pull the choke out. and have someone plug the exhaust with a rag in the palm of their glove... and spin the snot out of it... the fuel will ignite and pop a bit, the person who is plugging the pipe needs to go through a process of hearing the state of the engine and allowing it to breath by removing the restriction.. in about 2 or 3 minutes the fuel that you have already ignited and backfired on will warm up the engine enough and poof, its running... we have come up with an idea to use hydraulic quick connects on the water lines and bolt a small automotive oil cooler to the radiator of the truck and have quick connects on it as well as an electric circulating pump... this way we start the truck, we let the engine heat up, and then circulate the fluid through the sleds etc... if we all did this, then we would make up a manifold to circulate more fluid through more machines... all our machines have the same coolent requirments, and we all use watter wetter... so it would be a cool way to also filter and recycle and flush the cooling systems all at once... the reason for the hydraulic connections is that this allows everything to hold coolent so no need to bleed the lines etc,,, this may sound rediculous to you warmer climate people,,,but remember, here were I am, and likley were bushpilot is, we live in colder temps then the inside of most freezers, for about 7 months a year...