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  #1  
Old 06-13-2021, 11:03 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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Default Carb Throttle Arm and Cable Bushing…

We are doing Dynamic Prop Balance on RV-12 with 370TT. IPS started at 4.6 and now at 0.6 without too much fuss. We are also doing carb balance and notice throttle arm / cable bushing wear on both carbs. See photos below - throttle arm photo is out of focus, but you can still see elongated hole…
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 740

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #2  
Old 06-13-2021, 11:13 AM
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Tony_T Tony_T is online now
 
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Hey Jim,

Be sitting down when you price those parts.

But, as I recall, you have a couple of spare used carbs. The parts on those may be OK to use?
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E-LSA RV-12 ULS

Last edited by Tony_T : 06-13-2021 at 11:19 AM.
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  #3  
Old 06-13-2021, 11:38 AM
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Piper J3 Piper J3 is offline
 
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Right you are Tony - see pic below. I bought two (never used) 914 carbs on eBay a couple years ago for $395.
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 740

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #4  
Old 06-13-2021, 01:08 PM
seagull seagull is offline
 
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I had wear on mine at the full open stop, there was a notch where it hits. The cost scared me so I welded it with the TIG. I would probably do the same if mine wore like yours.
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  #5  
Old 06-13-2021, 01:23 PM
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Tony_T Tony_T is online now
 
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Quote:
Originally Posted by Piper J3 View Post
Right you are Tony - see pic below. I bought two (never used) 914 carbs on eBay a couple years ago for $395.
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Those look great.
You will need to replace the Nylock lock nuts (and metric screws) with all metal U.S. lock nuts if you want to stay in compliance with notification 14-07-03.
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  #6  
Old 06-13-2021, 01:33 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by Tony_T View Post
Those look great.
You will need to replace the Nylock lock nuts (and metric screws) with all metal U.S. lock nuts if you want to stay in compliance with notification 14-07-03.
Looks like we saved ~$160 + shipping. Why so expensive???
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 740

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #7  
Old 06-13-2021, 04:55 PM
mdoyle mdoyle is offline
 
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Jim,

I am based at I19 and would like to have my prop dynamically balanced. Did you hire someone locally to do the balancing? Did you take any pictures of the process?

Thanks
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  #8  
Old 06-13-2021, 05:06 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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If you flew for a lot of hours at 4.6 ips that could be some explanation for the wear.

Rotax recommends this pivot joint be lubricated occasionally. A recommended method is to use a drop of engine oil from the dip stick on each point during each oil change , then wipe off the excess with a rag after it soaks in a bit.
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  #9  
Old 06-13-2021, 06:09 PM
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Piper J3 Piper J3 is offline
 
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Correct answer would be Rotax should make parts from hardened steel. $48 for arm and $28 for the bushing per carb. Nice business, if you can get it...
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 740

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #10  
Old 06-15-2021, 01:43 PM
skydiverlv skydiverlv is offline
 
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Quote:
Originally Posted by Piper J3 View Post
We are doing Dynamic Prop Balance on RV-12 with 370TT. IPS started at 4.6 and now at 0.6 without too much fuss.
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I have a Smart Avionics balancer that I use for dynamic balancing and the instructions state that if the initial dynamic balance is greater than 1.5ips, the propeller should be removed and static balanced, or locate and correct a mechanical issue (think carb balance, prop track or other issues) before proceeding with the dynamic balance. If the initial balance was actually 4.6ips and you succeed in obtaining a semi acceptable balance at a given rpm, you will still have balance issues at varying rpms due to inertia associated with ips theory. I have a Prince wood/carbon fiber propeller on my RV12 and balanced to .02ips in flight at cruise rpm. However, I have no carb sync to deal with.
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