KR> KR2- 2180 GPAC Vw rough under 1100-1500 RPM

[jeffyor...@qx.net]

Ok, I am ashamed to say that N839BG has been idle for a year. But I have 
drained the old 100LL put everything back together and got it running again. 

I have noticed however that below 1500 maybe actually when you get down to 1100 
RPM it sounds a little rough. Just kind of a stumble in the normally smooth 
sound of the engine. I have a Zenith carb with no cockpit mixture control by 
the way.
Plugs where brand new a year ago when I got busy and let it sit. Got a feeling 
its a little out of time however, I can get a very clean 3400RPM static.

Thoughts?

Jeff York
KR-2 N839BG
Lexington, KY
http://web.qx.net/jeffyork40/

KR> KR2- 2180 GPAC Vw rough under 1100-1500 RPM

[Orma]

Hello Jeff
As far as being idle for a year, it happens to the best of us.  Those who 
are struggling to complete their KR's probably would disagree.
If the plane ran well when last flown,  Then as long as the engine does not 
quit at idle and makes as much power as you say, then I would go out and fly 
for an hour and then see what the idle is like.   I would stay on top of the 
airport just in case, but after a year the way something sounds and feels 
may have changed in your mind.
Orma
Southfield, MI
N110LR Tweety, old enough to drink this year
Flying and more flying, to the gathering or bust
http://www.kr-2.aviation-mechanics.com/ 

KR> KR2- 2180 GPAC Vw rough under 1100-1500 RPM

[Scott Cable]

Jeff,
The plugs may have been new a year ago, but it's a different story now that the 
engine has been sitting for a year.  My suggestion is to install new plugs, 
properly gapped, and torqued.
Check the plug wire connections also.  This includes removing and inspecting 
the distributor cap for corroded or pitted teminals.
Last year my friend started up his Harley sportster after having her sit idle 
for just over a year.
It idled fine, but had a miss upto 2500 rpm, then it ran fine.  He kept 
thinking there was something wrong with the carb.  I told him numerous times to 
change the plugs.  He kept insisting that the plugs were brand new when he 
stopped riding her.  Finally, after taking the float bowl off, checking the 
fuel filter, checking the coil, all of which were in perfect condition, he 
finally threw up his hands and put in a new set of plugs.  Viola! problem 
solved!  ran swt.  Don't ask me how they go bad just sitting, but they do.
Plugs are cheap and fairly easy to install.  Take out the variable by changing 
them first.

jeffyor...@qx.net wrote:
I have noticed however that below 1500 maybe actually when you get down to 1100 
RPM it sounds a little rough. Just kind of a stumble in the normally smooth 
sound of the engine. I have a Zenith carb with no cockpit mixture control by 
the way.
Plugs where brand new a year ago when I got busy and let it sit. Got a feeling 
its a little out of time however, I can get a very clean 3400RPM static.
Thoughts?





Scott Cable
Jamestown, ND
s2cab...@yahoo.com
__
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com