rhtrudder Posted July 29, 2018 Posted July 29, 2018 have a mate with a 80 Rotax , at cruise , 5200, when he backs off the throttle a couple of hundred revs there is a slight miss but then settles down , does every time , l thought it was to high in the rev range to be carby balance, any ideas,
Downunder Posted July 30, 2018 Posted July 30, 2018 Could be the change from full main jet to needle jet..... Maybe check the rubber slide diaphragm for a pin hole? And needle clip setting.
rhtrudder Posted July 30, 2018 Author Posted July 30, 2018 You might be on to something, sort of sounds like fuel, thanks 1
skippydiesel Posted July 30, 2018 Posted July 30, 2018 Long shot but might as well throw in - as with all piston engines, any changes in throttle position should be gradual/smooth. Sharp changes can "upset" the engine as it adjusts to changes in air/fuel mixture.
alf jessup Posted August 3, 2018 Posted August 3, 2018 Rhrudder, What fuel does he run in it 91 or 95/98? Alf
rhtrudder Posted August 3, 2018 Author Posted August 3, 2018 Unsure , but I will find out , plane is a Europa, the one with the mono wheel and two wing stalks, gets along pretty good , thought the problem might have been a throttle cable hanging up but thinking about it the cables are pulling the butterflies closed when throttling back
alf jessup Posted August 3, 2018 Posted August 3, 2018 Wal at Floods says only to use 91 octane on the 80 hp as that is what it will run best on. Mind you a reputable brand though BP, Shell, Caltex ect 1
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