Jerry,
When you rebuilt the carbs, did the rebuild kit come with "O" rings
rather than gaskets for the big bolt that holds the carb bowl on?
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop.
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
On May 5, 2013, at 2:43 PM, Jerry Rehn <rehn@rockisland.com> wrote:
A little history. Engine has about 450 hours, always ran quite well,
replaced upper ignition module about two years ago.
On recent full boost takeoff, got to about 900 feet leveled off, pulled
throttle back and engine ran severe rough, pulled back to idle and
engine ran ok, didn=92t stop! Landed. Checked fuel filter, ok, looked
for anything around carbs, nothing. Tried several full run ups, ok.
Tried second take off everything fine, pulled back and again engine ran
severe rough, pulled back to idle, ran rough, landed. Parked plane, got
tools, next day removed carbs looked for issues. Found one of the four
screws that holds down the rubber diaphragm loose, very strange because
I have never removed this before. Anyway figured this was my problem.
Fixed took off all ok. Got home. Next day tried full boost, same issue
again, didn=92t take off. Got carburetor repair kit and went through
both carbs. Reinstalled carbs double checked. Started right up, as I
move the throttle past 2300 rpm the yellow caution light starts
blinking, engine runs rough, reduce rpm the light goes off, increase the
light comes back on. Seems the engine runs off the idle jet ok but not
on the main jet.
I have also checked the waste gate for proper function, fuel pressure
ok, turbo lights come on and go off as they should when master is tuned
on, I have looked at the vent lines. The yellow blinking light can
indicate a sensor failure, seems like it would continue blinking if
there was a failure. Seems odd that it stops at low rpm. Seems I have
some kind of a vacuum or pressure issue, but am running out of ideas. I
am about to go and recheck again! Could a faulty sensor cause this?
Hope someone out there has some wise thoughts on this frustrating
problem. Worse yet, we have beautiful spring flying weather!
Thanks for help.
Jerry
914 Mono XS
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