582 Decrease in RPM after take off

Hi JazClub,

Any luck finding a solution to your decrease in RPM after take off issue?

I'm having the same problem with my 377, dual carb.

Thanks,

Ken Hiebert

See the same issue asked about in a number of forums.

To me this always points to carb float bowl level being a bit low,

Any update

I will check the float bowl level again.

However, I can report at this time, I've had one test flight and I might have cured the problem. I replaced the fuel filter and the fuel pump both at the same time. I'm hesitant about putting the fuel pump back in as a confirmation test.

Rotax 377, dual carb

Ken Hiebert

Static RPM is way too low

I have had this before. It overloads the engine(lugging). The EGTs will also e low.

That loss of power is the piston grabbing the cylinder wall. Reducing throttle makes it go away because you are reducing cylinder pressure and temp.

Get the static up around 6400-6500 and go from there....Find the balance.

Too much pitch = engine lugging, high cylinder pressure with low EGT

Too little pitch = lower cylinder pressure and higher EGT

 One other thing you didn't mention in your list of things you have checked was the float bowl vents. Rotaxes are very fussy about how they are set up.