R912 CARB
Hello,
I am looking for ways to eliminate my black spark plug problem on 2/4 cyl. Everything has been changed on the carburetor.
Thanks a lot for your answers
Hello,
I am looking for ways to eliminate my black spark plug problem on 2/4 cyl. Everything has been changed on the carburetor.
Thanks a lot for your answers
by Rob Seaton » 4 years ago
What position is the needle clip?
by Tyler Hathaway » 4 years ago
Plugs often get black during idle. When you did the most recent carb balance, did you check the idle-mixture setting?
by Roger Lee » 4 years ago
Dry black soot can be normal from idling. Either run the engine up at high rpm's on the ground or go fly, but shut down immediately after with no long taxi or idle time. If you play with things your not sure about you may cause issue you won't like or cost money.
Mkae sure your plugs aren't gapped too wide which might contribute to the soot at low rpms.
Rob may be onto something too. If someone was in the barbs make sure the needle clip is in the #3 clip postion.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
by BACQ JEAN SEBASTIEN » 4 years ago
thank-you for your prompt response,
My clips are in the standard position (2 it seems to me). Indeed, I have a lot of taxiing after landing. We're going to look at the idle screw. If I squeeze is it richer or less richer? I have a doubt...
Sincerely,
JSB
by Tyler Hathaway » 4 years ago
Clockwise is leaner. The standard procedure/position is to turn fully in (clockwise) then back it out (counterclockwise) one and a half turns.
The last time I checked mine, the screw on my 2/4 carb had somehow backed out to two full turns.
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