Rowland,
FWIW. That is the way my Choke has operated from day one.
I hold the choke out when starting cold. Use the throttle to set about
2000-2200
RPM to warm up. Then, continuing to hold the Choke knob, allow it to slowly
retreat to maintain that 2000-2200 RPM as the engine warms and RPM slowly
increases.
Kind of gives me something to do while monitoring Oil Pressure, Oil Temp,
Coolant Temp, CHT & EGT while warming the engine. My Choke will hold with
about 1/4 of travel remaining. I have to be on the throttle when I push it
in that last quarter inch as the engine RPM will drop quite a bit and I have to
add throttle to get it back above 1800 RPM.
I dont know of any means of increasing friction in the cable system to allow the
cable to hold against the springs on the carbs.
Hope this helps. Maybe someone else can come up with a better idea.
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop (85 hrs).
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
On Apr 6, 2016, at 12:53 PM, Rowland Carson <rowlandcarson@gmail.com> wrote:
Ive got to the stage of hanging my Rotax 912ULS engine on my Europa XS monowheel
fuselage, just to check how and where various things will fit and where holes
have to be made in the firewall, etc. (The firewall is not yet fitted at this
stage and the engine will be coming off again later to fit that.)
Ive connected the choke cables to the carbs but am puzzled by the resulting
action
at the knob. It seems to need quite a bit of effort to pull it out, and it
will not stay in the out (ie choke on) position, but slides back in to almost
the rest position immediately.
I routed the cables the same way as the throttle cables, through the small gap
between the top tube of the landing gear frame and the corner of the phenolic
firewall, and they seem quite comfortable there. I have fitted the SkyDrive carb
heaters which move the carbs aftwards a little, but I don't think that has
a significant effect on the cable routing.
I had to snip a tiny bit off the stiff soldered ends of the cable inners in
order
to persuade them round the right-angle guide on the carbs, but otherwise I
believe I have followed the manual exactly.
Is it intended that the choke knob has to be held out manually? Or is there some
trick Ive missed?
in friendship
Rowland
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