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05-15-2017, 09:05 AM
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Join Date: Sep 2006
Location: Windsor, California
Posts: 920
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Introduction of New-Style Carb Floats
FYI -- ROTAX has issued an SI describing their new-style replacement carb floats.
See: https://legacy.rotaxowner.com/si_tb_...si-912-029.pdf
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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)! 
V AF donation through June 2021.
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05-15-2017, 02:27 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,056
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It appears that they shortened the length of the brass guide sleeve thus lightening the overall assembly which would make it more buoyant. What's another $200? 
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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 618
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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05-15-2017, 07:08 PM
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Join Date: Dec 2005
Posts: 917
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Watched a pair of the new ones get installed last week, worked as advertised.
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Mike C.
Sierra Nevada
RV-6A bought flying
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05-15-2017, 07:19 PM
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Join Date: Jan 2005
Location: Granbury Texas
Posts: 1,136
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So have they corrected the material issue that over time allowed them to absorb fuel or just lightened them up.
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Built, RV 8, RV8A, RV 10, RV12, Purchased RV7A
Restored J3Cub and PA28R180
Pecan Plantation
Eagles Nest Mentor
EAA Tech Counselor
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05-15-2017, 07:26 PM
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Join Date: Sep 2011
Location: WV22
Posts: 849
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It's not the first time Bing has changed the floats. Nonetheless, glad they stay on top of things.
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RV-4 0320\D3G 160, Whirlwind 200GA 70".
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05-16-2017, 08:18 AM
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Join Date: Aug 2009
Location: Fort Atkinson, Wisconsin
Posts: 54
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New Engine
My brand new engine arrived from Van's a week ago. I will have to check to see if new floats were included, but I am going to assume that I have previous style. Looks like I'll be getting new-style floats while engine is still on bench. Is there going to be a market for unused older-style floats? Anyone interested?
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Ronald F. Chisholm
RV-12; N439CH - Flying!
RV grinnin'!
2020 dues paid!
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05-16-2017, 08:41 AM
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Join Date: Sep 2006
Location: Windsor, California
Posts: 920
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I sent you a PM. -- David
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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)!
V AF donation through June 2021.
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05-16-2017, 08:46 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,026
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NOTE:
I read nothing in this Service Instruction that recommends or requires that all operators change to this new(est) style float.
For those new to the engine..... Rotax regularly issues service instructions that give details about design changes that have occurred.
Example - They issued one when the new style iS cyl heads were adopted for use on the carburated engine. That did not mean that everyone with a carburated engine was supposed to replace there cyl heads.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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05-16-2017, 08:55 AM
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Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
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My carb floats have over 900 hours on them.
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John
RV12 N1212K
Flying Since June 2010
1020 Hours as of 9/30/2017 
Johnrv12@icloud.com
RV14 Wing, arrived and building at Rdog's new Hanger at 16X
S/N 140014
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05-17-2017, 05:16 PM
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Join Date: Feb 2015
Location: Pagosa Springs Colorado
Posts: 13
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New Rotax FLoats
A few weeks ago I had a needle stick on one carb. It pumped fuel overboard. Six hours on the motor. Fortunately, I was only taxiing. My motor's serial number is beyond the number affected by the 2015 Rotax Service bulletin. While cleaning the mid-range jet seat I had occasion to check the floats. The up-graded service bullet floats are identified by two small dots on one side of each float. One float had the two dots, the other had no dots.
I called Lockwood Aero and was advised that the some of the new two dot floats are also absorbing fuel and sinking. They had to return hundreds of them and now only stock the allegedly new floats, which are identified with three dots. I just ordered them for both carbs ($45.00 each times four) and received them two weeks ago--They are in fact identified with three dots. I installed same. Everything seems to be running well again. According to Lockwood, any float which weighs more than 2.9 grams is defective.
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