Hey, I've been involved in R/C on and off for a while now and am pretty fluent in the electrics branch of our hobby. However, I'm a newby when it comes to nitro. I recently bought an RC10 GT Factory Team for a non pullstart engine. On the advice of people online, I picked up the O.S. .12 CV-R w/10ER Rotary Carb. I finished building the kit a couple nights ago and am now in the process of breaking in the engine. This is where my troubles begin.

I bought a good starter box, a decent glow plug ignitor, and the fuel recommened to me by my hobby shop guy. I start the engine up, with the recommended factory settings for the first tank, and it goes fine for a minute or two and then stalls. I start up again. Same thing. It seems to stall all the time. Is this normal? It's frustrating because the starter box batteries will die or my ignitor will die and then I have to wait awhile to try again. I'm still on the first tank for crying out loud! Help a noob. Please.

Yea its pretty typical for the engine to stall alot at first because it is running so rich. I know there are several ways of tuning your engine, but i'm assuming you're following the instructions that came with the engine, which is fine. Just keep it nice and rich like the instructions say, and be patient! After a tank or two the thing should start to run a little more consitantly, and as soon as you start to lean it out you'll be in good shape. I started out almost the same as you 6 years ago with a rc--10gt and an os cv-x. My engine is still running strong!

Hmmm..... Mine never stalled? I would first check to see that the throttle wasn't closing all the way when the brakes are applied. You should maintain that 1mm opening when you hit the brakes. Other than that it sounds like your lsn is a little rich you might want to turn it in a 1/8 and see if it helps.

My first two tanks were hell. Lots of emptying flooded engines and pains to get it started with all the extra fuel. For the first two tanks i had to have at least some throttle given or else it wouldn't start let alone stay running. It wasn't until the third tank when I could start leaning it out when the engine started being nicer to me. Also make sure your idle screw is set right. It will help a little bit, but while breaking in the first few tanks the engine doesn't want to idle too nicely.

[edit] agh.. I said almost the same as Memo

well i just broke in my os .12 cv-x engine yesterday. Let me say i went exactly what you are going through. The conclusion i came to was that the instructions simply werent accurate for this engine. With the HSN at 2 turns out as recommended all it did was stall, if it started at all. Then i read that stalling when accelerating is actually a result of a lean engine which made sense as there wasnt much smoke out of the exhuast. So i richened the engine to 3 turns out 1/8th of a turn at a time and each time it ran better and better. Now its at 3 turns out and when i accelerate it no longer stalls, and it idles well. I didnt alter the idle needle at all so i can only conclude that its best to just adjust to needle to whatever works best. Now i will gradually lean it and see what happens. Hope this helps!

i have a temp gauge on my os max 15cv how hot is to hot

240-270 is the happy place for engines and 300 is where you should consider letting it cool to room temp. dont tune your engine for temps, tune it for performance.