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carburetor rebuilt schedule

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Mar 04, 2007 6:26 pm Post subject: carburetor rebuilt schedule

| How often does one rebuild a carburetor?



John M:



Usually, the parts that wear in a two and four stroke carb are the 

little tangs on the floats, the little arms on the float lever, the 

posts the floats ride on.  Also the enricher valve.



I check mine periodically.  If they look pretty worn, I replace the 

worn part.  Don't do it very often though cause Bing parts are out of 

sight.



john h

mkIII

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Sun Mar 04, 2007 7:40 pm Post subject: Re: carburetor rebuilt schedule

Hi All,



The manual says every 200 hrs. for the 912uls and the rebuild kit cost $214 for the pair from CPS.

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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Mar 04, 2007 7:53 pm Post subject: Re: carburetor rebuilt schedule

Roger L:



I'd go broke rebuilding carbs if I built them every 200 hours.  More realistically, take a look at them every 200 hours.



Also of extreme importance for two and four stroke carbs is to pull the float bowl and check for water and contamination.  A drop of water will turn into a lot of crud that can shut down a two or four stroke.

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Mar 04, 2007 7:55 pm Post subject: Re: carburetor rebuilt schedule

Forgot to mention, check those float bowls at least every couple weeks. At the longest once a month.

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

thomriddle(at)adelphia.ne
Guest

Posted: Mon Mar 05, 2007 5:57 am Post subject: carburetor rebuilt schedule

..The manual says every 200 hrs. for the 912uls and the rebuild kit 

cost $214 for

       the pair from CPS....



A couple months ago, I removed, cleaned and inspected the carbs on a 

Diamond Katana with certified 912F engine at the request of the owner. 

(I'm an FAA Powerplant Mechanic so it was legal.) The reason for doing 

it was that he had hard starting when hot and rough idle. Upon 

inspection I found that both starter jets were wrong number, one too 

rich, and one two lean, the mixture adjust o-ring was brittle and 

cracked on both carbs. I ordered the minimum of rebuild kits from 

Lockwood since they are cheaper than Bing distributor prices and new 

starter jets. The whole thing for both carbs was about $60. I replaced 

only the parts that needed replacing, cleaned everything, reassembled 

it, balanced the carbs and gave the owner the left over gaskets and 

o-rings that came in the minimum gasket/seal kit for him to use if/when 

they are needed. It runs like a sewing machine now. The condition of 

the o-rings as well as inspection of the log books told me that the 

carbs had never been removed, cleaned and inspected in a few thousand 

hours.



The moral of this story is that manufacturers and parts suppliers make 

money by selling parts. IF they can sell you a $214 kit every 200 hours 

of use, it accomplishes two things. 1) covers their arse. 2) generates 

a lot of un-earned income for them. I did not replace the gaskets and 

o-rings that were still in good shape, nor the float mechanism parts 

because they were still good and new ones are expensive. If they don't 

need it, your replacing them makes the manufacturers and parts 

suppliers very happy and your wallet thinner, but does nothing to 

enhance the function or operation of your engine. If they are needed, 

then by all means replace them, otherwise, why waste your money?



Get to know your engine and listen to it and monitor it very carefully. 

It will tell you when it needs attention. It costs nothing but a little 

labor to remove, inspect and clean the carbs, so doing it every 200 

hours is not a bad idea, but replacing parts that are still good is a 

waste of money IMO. If you take apart a Bing Carb please do yourself a 

favor and spend the $10 Bing charges for their manual, before doing so, 

it is the cheapest and best investment one can make regarding Bing 

carbs.



My opinion is cheap, as is my labor or my airplane, but Bing parts 

(except for their manual) are outrageously priced.



Thom in Buffalo

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon Mar 05, 2007 7:53 am Post subject: Re: carburetor rebuilt schedule

Hi John,

I think Thom makes a good point.



I'm with you on not always rebuilding carbs every 200 hrs. It was only what the manual stated and a price out of CPS. I believe in inspecting and sync to check performance. That being said, I would only not follow the book if I did not have any warranty or insurance.

I think flying is taking care of your aircraft before something becomes an issue. Sometimes stretching something out to the last penny cost you more later in money and heartache.

We all believe this to some point, more or less, or we wouldn't change oil, filters or plugs by the tach, we would wait until we squeezed the last penny out of our oil, filter and plugs. We all have our own limits on replacement programs from the manual.

My new plane is warrantied and insured so I pretty much go by the book. The first incident and they will check your logbook for proper maint. If poor maint. schedule or a mod. is noted which contributed to an incident then you might as well not even have a warranty and and not bother with insurance at all.



We all have seen too many people fly and their lives hang on the all mightly dollar and no matter what you say you couldn't convence them of this. You have a bigger responsibility to yourself to come home every night. We have had too many crashes this year for different reasons, but to save a dollar!

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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

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