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Sear Suburban 12 Carb issues


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#1 Alberta Bolens OFFLINE  

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Posted April 23, 2017 - 06:28 PM

I brought the SS12 into the shop today to see about getting it cleaned up etc.  Other than getting it started last fall have not done anything ot it since I bought it.

 

It starts and runs, engine sounds good It just won't idle properly. Problem is, I have to have the choke on part way for it to run smooth.  

 

I found the hole is worn where the butterfly shaft goes through the housing.  Is there bushings avalaible for this or do I have to find another or different carb.

 

 



#2 Bolens 1000 OFFLINE  

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Posted April 23, 2017 - 06:42 PM

What carb is on there right now?

Would this have an HH120?



#3 Alberta Bolens OFFLINE  

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Posted April 23, 2017 - 07:04 PM

Yes the engine is HH120 and it has a LME carb

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#4 classic OFFLINE  

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Posted April 23, 2017 - 07:22 PM

Some guys drill out the carb body and install a bushing. Your throttle shaft is most likely worn, too. The throttle shafts are no longer available, but you can find NOS shafts sometimes. These LME carbs can also get warped at the mounting flange from over tightening them, so check that. File it flat if it's warped before putting it back on.
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#5 classic OFFLINE  

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Posted April 23, 2017 - 08:20 PM

I knew that I read about the bushings somewhere. This guy sells the bushings and the shaft. We'll worth picking these up and making the repair.
http://www.carbrescue.com/store.html
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#6 chieffan OFFLINE  

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Posted April 24, 2017 - 07:26 AM

On mine the shaft was not wore but the carb casting was.  Drilled it out and  installed a cut off expended .22 case in the casting.  Had to dress the shaft just a tiny bit to get it to turn free.  Now have brass on brass.



#7 MH81 OFFLINE  

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Posted April 24, 2017 - 07:28 AM

It sounds as if it must be very Warren to affect air mixture. And if that is the case you will have to Bush .
Before you do that, try to clean it by mixing a little 50/50 gas and acetone. Take It Outside to start it. Get the RPMs up to about 3/4 and then put your hand over the air intake. Do that 2 or 3 times and it may clean the crud out of the bypass

#8 MH81 OFFLINE  

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Posted April 24, 2017 - 07:29 AM

Don't forget to take the mixed gas out after you have done this though.

#9 TAHOE OFFLINE  

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Posted April 24, 2017 - 07:51 AM

Sounds like part choke maybe a clogged idle jet. The worn bushing could also cause a lean issue.

If you clean carb and remove the main jet, you have to either get a replacement or cut a groove in it were the small hole it near the tip of it won't run right. They install them in the carb, then drill the holes through carb and into jet.

I second the link to Carb Rescue, Mark does a fantastic job on these old carbs.






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