hi

this is my quote from an os forum

'MY os 140 quits(hunts and quits) at 1/4 throttle in flight it seems that the engine has fuel starvation at this piont,because when I prime the engine it take a couple of flicks to prime it .I did test the engine on ground (pointing the model vertical at full throttle and back to idle then full throttle . idle reliability-left the engine running at idle for one min and to full throttle (didn’t miss a beat)).My set up apc 17x10N home brew fuel semsynt 18%oil 15% nitro glow type F os carbon pipe. I have also read that after 30 flights the engine needs to be cleaned. Can I inject methanol in to the pump by a hand pump with out removing the engine and pipe but leaving the pipe attached to the main needle (also removed) and disconnect the 2nd pipe ?'

Well I did clean the pump and found a lot of gum,althoug I think it did help becasue the flight duration was longer but still the engine is hunting even when my funtana 140 is flying stright and level at 1/4 thottelThe engine quits at TDC.Should i install a hopper tank ?I did flly with the glow on.Should i adjust the slow end needle ?


Alan