Loss of power doing climb

Hi Michael,

Sounds like a fuel flow problem. A flow restriction may limit the underload engine speed.

Did the problem start when the carburettors were "overhauled"?

How many hours has the engine done?

When was the last 5 year rubber replacement? 

Did the rubber replacement include all hoses, back to the tank(s)?

What of engine EGT readings ?

Inspect float bowls for contaminates.

Try flushing the fuel supply system by disconnecting the lines at the carburettor and running the Boost pump - inspect fuel flow into bucket for equal delivery. Check collected fuel for contaminants such as paint flakes, rubber , etc. 

I would also question your engine management technique. A Rotax 9 should be doing a MINIMUM of 5200 rpm during climb procedures.😈

Hi Sean,

Thanks for your answer.

Have been running 40 hours from carb overhaul and rubber replacement. 

EGT: Doing the happening there become a significant difference of around 180 degrees.

I will try the suggested.