Engine/carburetor problem

Hi Beny

I think you need to supply a lot more detail so someone can offer some help.  Perhaps what type of aircraft, used or new, prop information perhaps.  How many hours?  Is this a new installation? If not then has this worked in the past?  Think about all the details you can for some help and suggestions. 

Cheers

This is a 912 engine mounted on a flying ATV
It underwent maintenance 100 hours ago, a month ago, one flight of one hour passed without any problem. On the second flight, stutters appeared. The throttle did not rise after takeoff and we returned to the landing, and this time as well, when taking off, engine 5450 immediately after disconnection, it dropped to 4600 and was unable to raise the throttle beyond that. During the treatment, the nozzles were opened, cleaned and returned. His face looks very normal, only that a flight after the treatment started problems of lack of lifting of the sled

It means that everything happened after 100 hours of treatment

Possible;

Air leak

Fuel starvation

Loose ignition connection

What are your

EGT readings

Fuel pressure readings pre start / post start / 4000 rpm run up with & without boost pump 

Air leak or ignition connection engine was stuttering
But it's not simple after opening the throttle immediately drops to 4600 and gets stuck there