comde

Hello,
i´m just breaking in a OS FS-70 Ultimate and i have a problem with it. Beginning at middle throttle i see many bubbles coming from the pump to the carburetor and the engine isn´t getting faster and just quits. The bubbles are not coming from the tank system, as there are no bubbles in that line.

What can be the problem? Adjusting both screws isn´t helping.


Regards
Marco

Bax

My Feedback: (11)

First off, please make sure that the return line goes back to the tank and dumps at the forward, bottom of the tank. That's very important.

Otherwise, if the engine's plumbed properly, then the pump may have a problem, and the engine needs to come into the service center.

arostosgr

hello there this is my first time writting here. I come from Greece.
I have exactly the same problem...
But I had ~20 flights and the engine was the best... At the 21 I had the same problem during the flight.
From then the engine has not run again properly...
After half throtle i have the bubles and the engine quits..
I realy thinking go back to the two stroke os engines...
Everything in the engine is good... tank and fuel lines.. also 20% oil in the fuel.
Please realy we need your help if you know anything...
Thanks,Andrew Athanasoulas!

arostosgr

hello there this is my first time writting here. I come from Greece.
I have the following problem:
Beginning at middle throttle i see many bubbles coming from the pump to the carburetor and the engine isn/t getting faster and just quits. The bubbles are not coming from the tank system, as there are no bubbles in that line.
But I had ~20 flights and the engine was the best... At the 21 I had the problem during the flight.
From then the engine has not run again properly...
After half throtle i have the bubles and the engine quits..
I realy thinking go back to the two stroke os engines...
Everything in the engine is good... tank and fuel lines.. also 20% oil in the fuel.
Please realy we need your help if you know anything...
Thanks,Andrew Athanasoulas!