You shouldn't run it out of fuel. End of the day after you stop the engine dump the fuel in the tank and that's it other then cleaning the exterior of it. A hot and assuming humid shed is the last place you want to leave your engine and car. Those conditions alone will start the steel to rust.
Never heard or used AT fuel. I have only used Byrons...because it works

So can I salvage the motor, just needs a good clean?

How can I go about cleaning it all up, piston/sleeve, crank, bearings? Im not going to get anywhere unless that sleeve comes out!

Can 8L of fuel do that much damage?

I think AT fuel is from an Australian manufacturer - http://www.atracing.com.au/. There are top level racers here in Australia that use the fuel...

I tip the fuel out of the tank so I'll leave it at that. So its OK to leave fuel in the line and motor for a while? No need for after run oil? I dont race that often so the rust build up is always going to happen?

I guess the best place to leave car now is in the house then!

My god! I assumed the internals were in good condition after only 7l of fuel. Wow! If you have good fuel you shouldnt need any after run oil, unless it will be unused for months. You have to get that piston and sleeve out for inspection. If the piston is scratch above the oil rings, engine is toast IMO.

Good luck with that thing

fuel is JUNK , leaving a nitro powered 2 stroke engine in your shed is sacrelige (sp? )

fyi , youll break that sleeve in half if you keep prying

I can get Byron RACE Gen2 fuel, is this a better choice?

The top of the piston where the 2 x rings are is OK, there are no scratches on the corner/edge of the top of the piston.

I had to use vice grips to get the sleeve out, I scratched underneath the lip, is this useless now?

Yea, now the seal between sleeve and case is compromised. Byron fuel is one of the best fuels in the world. Buy a new nova and feed it some Byron fuel.

next time pry up the sleeve just use a nice flat blade screw driver, any scratches etc etc is not good use a heat gun on the block keep your clutch on and put a cable tie thru the exhaust that will lift the sleeve. in Australia try either nitro-x or amain fuel be sure to have a small bit of caster in there should help, most guys on here break there engines down either after ever meet or second meet give it a good clean check for any foreign objects check bearings and relube with after run or atf and rebuild ready to go. good house keeping on your engine goes along way!!!

If you don't remember this statement from Novarossi '12:

http://novarossi.com/2012/index.php/...statement.html

do you use a comp heater ? to me it looks like the oil iny our fuel has turned to glue......this will happen to some fuels when using a comp heat

Poor lil engine....

Any update on testing the new carbs?

I did use a comp heater maybe 5 times when the engine was new, then was using a heat gun for a while engine was still new. The first 2-3L was using a heat gun.

Once I get the break-in complete on my new mill I'll be doing some back to back testing with 24069(standard carb) vs 24067

Who are probably getting it for nothing or paying very little for it...same for their engines.

Another good fuel to use is either Nitrotane or VP Powermaster (both the same).