Hi oscar (post 21)
Which problems have you with the Dingo ?
Because I have a 140 Dingo on my Rhapsody (80 flights) and I also had a problem with the motor. It was difficult to start it and the power decreased.
The cause was the rotative valve on the rear of the motor which was rough.
I polished it to do the surface smooth and tightened it hard to obtain a good proofness.
The cause was the dust which was inhaled. The solution is to put a filter (tettra DX is good for this motor).
Claude