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seedeebee(at)hotmail.com
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 Posted: Sun Jan 01, 2006 10:11 pm Post subject: 912 Idle Issues |
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Fellow Kolbers,
A question about idle on the 912. My engine runs very rough below about 1800
RPM, but runs smoothly above that speed. At idle, if I actuate the choke,
the engine speed picks up considerably, like I hit the gas. The choke
doesn't cause the engine to run rough though.
Is this normal? If not, any ideas on what may be wrong?
Thanks and Happy New Year,
Chris Banys
MK III 912 UL
N10FR
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slyck(at)frontiernet.net
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| Posted: Mon Jan 02, 2006 6:08 am Post subject: 912 Idle Issues |
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sounds like lean idle mixture.
-BB do not archive
On 2, Jan 2006, at 1:11 AM, c b wrote:
Fellow Kolbers,
A question about idle on the 912. My engine runs very rough below
about 1800
RPM, but runs smoothly above that speed. At idle, if I actuate the
choke,
the engine speed picks up considerably, like I hit the gas. The choke
doesn't cause the engine to run rough though.
Is this normal? If not, any ideas on what may be wrong?
Thanks and Happy New Year,
Chris Banys
MK III 912 UL
N10FR
|
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jhauck(at)elmore.rr.com
Guest
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| Posted: Mon Jan 02, 2006 8:08 am Post subject: 912 Idle Issues |
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Chris/All:
When my 912 or 921S demonstrated the same symptoms of rough idle it
was caused by the need for carb synchronization and idle mixture
adjustment, or the need to have the torsional vibration dampner
snugged up to specs, or all the above.
The bing carb does not use a choke. It uses an enrichner which, if
operated correctly, will preclude the use of an additional primer.
The enrichner, on each carb, is designed to initially dump a load of
fuel into the intake. In order to do this correctly, the throttle
must be completely closed to idle position. Do not crack the throttle
or the enrichner will not operate as designed. Once the engine fires,
the initial rich charge is pulled out of the enrichner well. The
engine is now running on the enrichner jet which allows more fuel and
a larger air circuit to increase idle speed for the cold engine.
Instructions for synchronizing carbs and adjusting idle mixture and
speed are included in the operators manual and service manual, which
can be accessed at the Kodiak Reasearch web site.
john h
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