First Start
Posted: Thu Jul 28, 2022 4:23 am
by Skippydiesel
Exciting moment - I started my brand new Rotax 912 ULS for the first time yesterday.
Everything went very well:
Ambient 14C
Engine fired immediately & ran smoothly. Engine speed increased as it warmed up.
Idling too fast, 2300 rpm - easy fix.
EGT’s almost equal - this should come good with pneumatic carburettor balance.
Good oil & fuel pressure
Took engine to oil temp 57C & coolant 60C
Charge 12.6V 2 amps
Post engine inspection reveled a small fuel leak, from the connection to a fuel flow sensor - refitted with gas grade thread tape - fixed!
Will do a rough idle speed adjust down & check hydraulic lifters are all fully “primed” with appropriate clearance as per Rotax “purge” instructions.
Next start, will be with cowling fitted and once warmed, will fine tune the idle & do the pneumatic balance.
The excitement is almost too much to bear.
Re: First Start
Posted: Tue Aug 09, 2022 12:36 pm
by xeriotti
Show us that baby!!! 
Re: First Start
Posted: Tue Aug 09, 2022 7:24 pm
by daleandee
Skippydiesel wrote:Exciting moment - I started my brand new Rotax 912 ULS for the first time yesterday.
Post engine inspection reveled a small fuel leak, from the connection to a fuel flow sensor - refitted with gas grade thread tape - fixed!
Good deal on the first start! Great engine and very reliable.
BTW … I’m not a fan of using any kind of tape (especially Teflon) on fuel fittings as pieces can be torn loose and get into the fuel system. A small piece can clog an orifice and cause problems. Silicone sealer on fuel lines is also a horrible idea.
Permatex makes Aviation sealant especially for fuel line fittings.
Re: First Start
Posted: Tue Aug 09, 2022 10:10 pm
by Bryan Cotton
I used ez-turn per Joe Norris’ recommendation. I think the Aerovee manual also calls out teflon paste. I also avoid teflon tape except for house plumbing and shop air.
Re: First Start
Posted: Wed Aug 10, 2022 10:36 am
by 13brv3
Congrats on the first run! It sounds like it was as successful as you could ever hope for. The flying Rotax thread has been pretty lonely recently
Rusty (912UL Onex)
Re: First Start
Posted: Wed Aug 10, 2022 7:25 pm
by Skippydiesel
13brv3 wrote:Congrats on the first run! It sounds like it was as successful as you could ever hope for. The flying Rotax thread has been pretty lonely recently
Rusty (912UL Onex)
Hope to add to the “flying Rotax thread” within the next few weeks. Aircraft essentially complete - just trying to get coolant temperatures under control.