Hi all,

I've been flying R/C off and on for about 8 years, but I can't claim to be an expert engine tuner.
Primarily because the engines I've owned have all run quite reliably with few issues.

Got a friend who's learning with a Nextar trainer with an O.S. .40 or .46 fx bolted to the front of it.

Here's the scenario:
Throttle back on downwind leg and then down to 10% power during final.
On the power-up to do a go-around, it occasionally quits when we hit the gas.
It doesn't do a higher rpm thing like it's out of fuel, it just... stops immediately.

If we don't let it idle too long, it transitions nicely, but if we idle back for 20 seconds or more, it flames out.

Always at the end of the runway.
I'm getting tired of dead-sticking my friend's trainer into the weeds.
So far no damage, but the math will catch up to us sooner or later.