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Engine Running Lean on My 16/6


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#1 dmark OFFLINE  

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Posted April 27, 2010 - 06:29 PM

I am new to garden tractors having just picked up a Sears 16/6, Model # 917.25181 with a 16HP BF-MS/3265F Onan twin witha DD-15 carb. I got it running with a set of new points, a new float, and converted it with an external Onan fuel pump. The only problem now is that the choke needs to half way in order for it to run smooth, either at idle or full throtle. I cleaned the carb and tried different settings on the mixture screws, but no luck. I would appreciate any suggestions. Thanks.

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#2 mjodrey OFFLINE  

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Posted April 27, 2010 - 06:36 PM

dmark :welcometogttalk:

#3 chopperfreak2k1 OFFLINE  

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Posted April 27, 2010 - 06:50 PM

maybe rebuild the carb, or at least disassemble and clean toroughly. good luck and good lookin tractor!!

#4 Bolens 1000 OFFLINE  

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Posted April 27, 2010 - 07:28 PM

Welcome to the Forum, dmark :welcome:
You will find that there are many friendly and knowledgable people on here.
If you need it on choke to run it means it's not getting enough gas. Like chopperfreak stated I'd give it a good cleaning again and see what happens. If that does not help you may need to play around with the adjusting screws or adjust the float to allow more gas in. Posted Image And keep us posted.......

#5 olcowhand ONLINE  

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Posted April 27, 2010 - 07:34 PM

These Marvel Shreiber "DD" carbs are plenty particular. Did you take the old carb mounted fuel pump apart & clean it too? They tend to collect a lot of crap in them, even running a filter ahead. The micro particles gather in there & can come loose at any time & clog the jets/orfices. I'd bet if you go into the carb & old fuel pump again, you'll find more crud hiding. Also, after you had it running, did you pop the carb top to check the fuel level?
Also, the jet screws are extremely sensitive, and once you get the high speed set to run proper, then that affects the idle jet setting, so you have to go back & forth a few times to get it right on both low & high speed circuits.
Other than Tecumseh carbs, these DD's are about the 2nd hardest to dial in.

#6 NUTNDUN OFFLINE  

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Posted April 28, 2010 - 11:05 AM

All of the above mentioned tips sound good, it also sounds like you could have an air leak whether it be at the intake gasket or in the carb somewhere. I am not familiar with that carb.

#7 olcowhand ONLINE  

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Posted April 28, 2010 - 01:00 PM

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#8 dmark OFFLINE  

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Posted May 03, 2010 - 08:04 PM

Just a quick update - I gave the carb the once over again this weekend and found a plugged passage which was causing the problem. The engine is running strong and smooth. Thanks to everyone for the help.

Now I need to fix a couple of cosmetic problems. One of the hinge points on the upper grille is busted, and the cracked dash was fixed with a piece of plywood by the previous owner. Any help in locating these parts would be greatly appreciated.

#9 Bolens 1000 OFFLINE  

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Posted May 04, 2010 - 05:36 AM

Glad to hear that you got it running! :dancingbanana:

#10 Jasper OFFLINE  

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Posted August 09, 2010 - 01:30 AM

I have three ss/16s and they all have broken hinge points. I saw on one of the tractor sites where a man fixed his with metal reenforcement and overlayed it with fiberglass. After paint it look original and stronger than the OEM.

#11 MH81 ONLINE  

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Posted August 09, 2010 - 06:31 AM

You might try HERE. Guy's name is Bill, really nice fella. I guess he walked the whole place looking for my pulley. If you click on "CRAFTSMAN" in the rh column, then you can select "USED", it shows a partial list.

#12 ducky OFFLINE  

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Posted August 09, 2010 - 09:58 AM

Just an FYI. Something to keep in mind when experiencing fuel issues.
George is on to something there about vacuum leaks.
The Onan from FL was running on one cylinder due to an ignition issue. Fix that with a coil.
Then it would only run on 1 cylinder unless the choke was on. After 3 times though the carb I started looking else where. Found the intake manifold opened up at the seam where the 2 halves are put together. Put JB Weld around the whole seam and it is running without the choke.
Still has a bit of a gallop but as Daniel says it take several setting to get it right. Also found that the air filter makes a difference in the adjustment.
Suggest air filter in place when making the adjustment.




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