Hello gents.

I have done a few test runs of my new used Moki 250 on the bench, and I´m trying to get the needles dialed in correctly. It seems to run very nicely at it´s current setting, but I am a little worried that I may be running it a bit too lean at idle.
At the moment the engine will start quite easily at low idle, but will only rumble along on one or two cylinders for the first 10-30 seconds, and will not accelerate. But when the engine has warmed up a bit it runs very smooth on all cylinders, and acceleration is brisk.

I know that a correctly tuned two-stroke can show the same symptomes, not being able to accelerate from low idle before warming up a bit, but is it the same for a four-stroke? I don´t want to fry the engine with a lean run if I can help it.

Thanks in advance.

If the engine is starting ok ,I doubt that it is to lean. Not taking acceleration when cold is like you say normal of a well tuned gas engine. If your that concerned richen it up a tad on the low end and go fly it.

Cyberwolf is right on. +1 Capt,n

Thanks guys. You have confirmed my own gut feeling, and I´ll do the final tuning when the engine is installed in the model.