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Rotax 912 Carburetor - Possible to purchase a few O-Rings?

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nigel_graham(at)m-tecque.
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Posted: Sun Sep 20, 2015 2:25 am Post subject: Rotax 912 Carburetor - Possible to purchase a few O-Rings?

Jon,



The Bing carburettors used on the 912/4 series engines were developed 

originally for the BMW R65 motorcycle (Mid '70's era)

Overhaul kits for these can be obtained from vintage BMW motorcycle 

specialists such as Motorworks for a far more attractive price than 

you'll find at any Rotax dealer



Check out:

http://www.motorworks.co.uk/vlive/Shop/Parts.php?T=5&NU=15&M &Ct=FA&SbCt=BA_15_20_FA_45



Nigel



On 19/09/2015 06:21, italianjon wrote:

 	  Quote: 	
		   



 Hi All,



 I am wondering if it is possible to purchase a few O-Rings for a Rotax Carb, without buying the complete and expensive overhaul kit.



 I have a couple that are missing and/or cracked.



 Using Fig 73-14 of the latest issue Heavy Maintenance Manual as a guide, I am looking for 2 x O-Rings that dampen the needle (3 and 1 x O-Ring for the Idle Mixture Screw (37).



 Thanks



 Jon





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=447221#447221

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graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Mon May 21, 2018 1:11 am Post subject: Re: Rotax 912 Carburetor - Possible to purchase a few O-Rin

This old link no longer works; would the motorworks part be FUA35001J?

Bing carb for BMW R45 Pre 1981? Skydrive are out of stock of carb refurb kits



My 340hr/6 year old 912ULS missed a fraction of a beat a couple of times on Sat after running smoothly for over an hour, and spaced by maybe 20 minutes. Warm air, high presume no cloud and 3000ft in steady cruise, fuel filtered, filter changed recently, service 40hrs ago, fuel esso supreme. Wondered if it could be air pocket?

I'll change plugs, check plug sockets, carbs, filter, check fuel drain, clean air filter.

Suspect carb/fuel flow debris issue.

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_________________
Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk

Remi Guerner

Joined: 14 Dec 2010
Posts: 284

Posted: Tue May 22, 2018 3:23 am Post subject: Re: Rotax 912 Carburetor - Possible to purchase a few O-Rin

Graeme,

I suggest you do not fix anything. On a Rotax engine, the symptom you described is typical of carb ice. If the atmospherics conditions were not favoring  icing, then the cause of icing was water in the fuel.

Regards

Remi

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graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Tue May 22, 2018 10:19 am Post subject: Re: Rotax 912 Carburetor - Possible to purchase a few O-Rin

Thanks Remi, handy to know that. I'll check the other carb bowl and collect some fuel from the tank drains and just keep my eye on it a while before any drastic measures. 

About 18 hours ago  I changed the water, fuel and oil pipes; I hadn't really thought through that after that I would need another shake down with several cowl off checks and filter changes to make sure it had all settled down; I don't want to do drastic things and have to start that again.  



Just to have to hand I bought a set of bing carb gaskets, rings, diaphrams 32mm rebuild kit from motobins 16 11 1 254 774. part no 60020 about 50gbp

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