hey guys i have an rc10gt with the stock .15 AE motor in it. anyways the other day i ran it with all the xp fuel i had left and it ran perfect. so today i tried to take it out with this new cool power fuel we just got and it wont run. so i put a different glow plug in it but still wont run. it starts for a second and then shuts off and it just totally sucks ass. i am not a newb to this but can fuel really make a difference??? i changed the fuel line the glow plug twice and i took the motor out and cleaned it all inside and out. so now im stuck please try to give me some ideas or something idont know what to do. Thanks in advance
Mason

Did the nitro % change when you changed the fuel? I would return the carb settings to stock and see if that helps then tune accordingly. If that doesn't help any try another fuel because the fuel you have might have gone bad.

Ok first off when changing fuels you should always put the needle seting back to the factory setting. Every fuel is different in it's own way and there for has it's own personality. With some fuels you need to run the needles a little more rich then othere's. And vice versa, Ok after that some engine just wont run on other fuels at all. Some engine are picky, once you start with that fuel some engines just wont run unless you run that fuel. I have come across those type of engines. But most engine will run on other fuels then the one you started with. But your engine may not run with that type of fuel.

But basically you need to start off by seeting the needles off at the factory seeting's. This will give you a base of which to go from. This should be more then rich enough for any fuel. Then from there you should only have to fine tune it to your liking.


Well i hope this helps you.

Try using the other fuel. If it runs on that and not on the new fuel then it's obviously the fuel. If you do not have any more of the old fuel follow the above advice.

i dont have any of the old fuel left and i have tried going back to the factory settings. still no luck
it runs for about 10 seconds when its cold and then quits. i just dont get it. i have been in the hobby for 6 years and this puzzels me.i took the carb apart to see if something was plugged maybe? but it wasnt so i took the head off and the motor looks brand new. the piston inst even a little bit black on the top and the walls are perfect. any other suggestions would be greatly appreciated. im going to go and try and buy some new fuel tommorow.(if my dad lets me) haha
Thanks
Mason

What about compression, it might just be that time to rebuild your motor, new piston or sleeve perhaps. How long or how much have you run in that motor, it might just be coincedence that it happened when you switched fuel.

Having said that, motors dont just quit one day, they gradually loose performance and would start giving you problems, starting, tuning etc. etc.

Also if you changed nitro content (%), it is suggested you also change the type of glow plug (hotter, colder), proper shimming is also recemended.

i think cool power has to much oil % might be the problem you have to retune

Ok what does it sound like before it quits is it a blubbie type or does it rev up then quite.

Also what nitro percentage are you running and what percent did you run before. What plugs are you running are they hot, medium or cold plugs. Also try keeping the glow igniter on while it's running or are you alredy doing that. Also is the idle and the linkages right. Take off the air filter and check the opening in the carb how big is it. It should be about 1mm-2mm----------2mm being the most. And is the glow igniter even working take the glow plug out and attach it to the igniter and see if the element gets red hot. If not try another battery or try charging it.


The way it sounds as if it is just insanely rich and it just wont stay running.
But get back and if this doesnt help you any i will take another shot at it.

well guys i have tried everything you guys have listed with no luck.... i was running 20% and now 15%i have tried every glow plug imaginable and i have returned everything to factory settings.... i can drive it around for about 10 seconds and them it all of a sudden goes brrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr rrrrrr and them bum quitsits got a nice line of blue smoke coming out and it doent bog in the bottom end so i just dont know. but tommorow i will go dont to the hobby shop and spend another 38 dollers on a different kind of fuel i think this cool power stuff is ****y it runs good in our airplanes but runs terrible in our cars.

try leaning out the hsn with out touching the lsn. Or you could try taking out a shim this might also help. It seems the way that you put it that it is just simply to freakin rich. Or if you want to you could. Try taking of the exaust back pressure line that leads from the exaust to the tank. It's basically the same as leaning it out. I have tried this and some times it will help and sometimes it doesnt.

and as for getting another gallon of fuel that may be the only possible way to do it. Some engine are stubbborn and will only run with the kind of fuel you started them out on. Instead of dumping that fuel or giving it away. You could try blending the two fuels together. But start off by running the other fuel and if it start then your good. Then maybe add 3/4 of a good tank of fuel with a 1/4 of the bad fuel and see how it runs. I have done this before and it works. And it does work and it beats just having a 38 dollar gallonf of fuel sitting there. Might as well use it if you can. Or get someone to buy it off of you if you can. But if you to decide to mix them then i would mix maybe 3/4 of a quart and a 1/4 quart of the bad stuff.


I have done this before i mixed a batch of 4 year old fuel that didnt run by itself with a batch of good fuel. I had a 1/2 a gallong of the fuel that doesnt run right and i was determined to use it if at all possible. And to my suprise it ran fine. Tore the engine apart after using all the 4 year old fuel and it looked fine. But thats me and in the end it's up to you.

well guys i have good and bad news..... the good news is i found the problem.... the bad news is the motor has a big scar on the side of the cylender wall. i guess ill get a new motor any suggestions i was thinking of this one... http://www2.towerhobbies.com/cgi-bin...05&FVPROFIL=++

that motor is good, and the scar is caused my engine damage or somthing got inside the engine like a rock or dirt, make sure to have a good air filter

i use this
http://www2.towerhobbies.com/cgi-bin...?&I=LXDSZ9&P=7
it works great, plenty of air flow and never gets anything in the engine

Actaully to tell you the truth that was going to be my next guess. I had that happen with my one engine to. The chrome where the exaust port was, was completely gone and i had the same problem to. The chrome on the inside of my cylinder was bad, there must have been a chip in the exaust port when i got it but no biggy. But since you said you had it running fine and then changed fuel that kinda through me off a little. But yeah well you live and you learn right. Thats the exact same thing i have a xxx-nt and my cranks a little longer then that one is. But yeah that engine is great. Tons of power will make your rc10gt do wheelies all day long. Very reliable doesnt take much more then 2 secounds to start on the box starter. If even that long and holds a tune very well. Very little adjusting on the needles to make this thing go from mild to wild.

But as for that air filter i dont think that is big enough for the carb inlet. I just dont asee that thing working to well on there. I do have that air filter and it does the job but the engine may be starving for air at full throttle with that. I would have to go for a much larger air filter. But then again thats just me but i dont think that wil suplly enough air that will be needed but then again i might be wrong.