Today my flight instructor questioned the idle speed of my Rotax 912 ULS. He noted (correctly) that it was running between 2200 to 2300. I thought is was previously at about 2000 - but I'm not sure about that.
If it does need to be reduced, is that a big deal for me to make that change?
Rotax RPM at Idle
Moderator: drseti
Rotax RPM at Idle
Paul G
N400TL 2016 Sirius TL-3000
Chelan, WA (S10)
N400TL 2016 Sirius TL-3000
Chelan, WA (S10)
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Re: Rotax RPM at Idle
1) That sounds high. High enough it will cause a lot of float down the runway when trying to land.
2) I think most are happy with an idle speed of between 1,600 and 1,800 rpm.
3) If it changed on your plane, there's got to be a reason - cable not seated the same, choke part way on, that sort of thing. Worth checking out.
4) You cannot legally change your idle setting unless you are an LSRM or better, or certified Experimental.
5) When changing the idle rpm, probably best to do a carb sync at the same time.
2) I think most are happy with an idle speed of between 1,600 and 1,800 rpm.
3) If it changed on your plane, there's got to be a reason - cable not seated the same, choke part way on, that sort of thing. Worth checking out.
4) You cannot legally change your idle setting unless you are an LSRM or better, or certified Experimental.
5) When changing the idle rpm, probably best to do a carb sync at the same time.
Re: Rotax RPM at Idle
I'm willing to bet the RPM was properly set to 1700 RPM or so - during the winter! Come Spring, the bowden cables warm up, change length, and the idle speed changes. One should re-sync the carbs twice a year, at the changing of the seasons (i.e, Spring and Autumn).
The opinions posted are those of one CFI, and do not necessarily represent the FAA or its lawyers.
Prof H Paul Shuch
PhD CFII DPE LSRM-A/GL/WS/PPC iRMT
AvSport LLC, KLHV
[email protected]
AvSport.org
facebook.com/SportFlying
SportPilotExaminer.US
Prof H Paul Shuch
PhD CFII DPE LSRM-A/GL/WS/PPC iRMT
AvSport LLC, KLHV
[email protected]
AvSport.org
facebook.com/SportFlying
SportPilotExaminer.US
Re: Rotax RPM at Idle
That idle rpm is too high and you'll just ride your brakes to death. Lower it down to around 1650-1700. You never want to sit at this low idle, but keep it up to around 2K, but the low rpm is good for approaches and when shutting down the engine.
You will need to put the carbs ion gauges to make this adjustment. There is NO way to know which carb has the bigger influence or which one to adjust without them.
You will need to put the carbs ion gauges to make this adjustment. There is NO way to know which carb has the bigger influence or which one to adjust without them.
Roger Lee
Tucson, Az.
LSRM-A, Rotax Instructor & Rotax IRC
(520) 574-1080 (Home) Try Home First.
(520) 349-7056 (Cell)
Tucson, Az.
LSRM-A, Rotax Instructor & Rotax IRC
(520) 574-1080 (Home) Try Home First.
(520) 349-7056 (Cell)
Re: Rotax RPM at Idle
Thanks to each of you for your replies. I will be taking it in to my A&P for some adjustments.
Paul G
N400TL 2016 Sirius TL-3000
Chelan, WA (S10)
N400TL 2016 Sirius TL-3000
Chelan, WA (S10)