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Onan 20


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#1 JoshBrown OFFLINE  

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Posted February 22, 2011 - 06:11 PM

I am getting ready to start to work on the carb and want to get some parts for it. I have not taken apart a carb for an onan before. Does anybody have any exploded views or manuals for my tractor, motor or carb. Anything that I can download or print off would be great. I tried to download a manual from the forum on here and didn't have any luck. Obviously the motor and carb are not original but any kind of manuals ect will help. Also can anyone tell me what year this tractor/ Motor is?
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#2 wvbuzzmaster OFFLINE  

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Posted February 22, 2011 - 06:29 PM

Sorry I can't be of much help, all my manuals are for the Kohler Cases... and I don't own an Onan.
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#3 JoshBrown OFFLINE  

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Posted February 22, 2011 - 06:31 PM

Thanks anyways Casey

#4 NUTNDUN OFFLINE  

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Posted February 22, 2011 - 06:32 PM

It is a BF motor so the carbs are easier to take off. The carbs on the performer series are a pain in the rear to get off. I thought we had an Onan manual in the manuals section?

If not I believe I have an Onan manual I can scan and put up on the site.

#5 olcowhand ONLINE  

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Posted February 22, 2011 - 06:47 PM

No, not a BF. This one is a 20hp with 3 1/4" bore. The BF has 3 1/8" bore. Should have a carb like a B48 Onan, but I can't remember for sure. Get those numbers off the carb & post them, it will help. I think maybe the tractor is a 72 or close to that. I think it has some yellow paint underneath the flambeau red.

#6 JoshBrown OFFLINE  

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Posted February 22, 2011 - 06:51 PM

Ok I will check again. I ran the identifying # on it and it said it used a 146-0356 kit that was suppose to be for a generator. I foun one on ebay for $65.00. Onan Generator Carburetor Kit 146-0356 - eBay (item 320649034407 end time Feb-26-11 14:45:15 PST) Does this seem right or would I be better of just buying a one of these for $50.00. Wheel Horse 520-H Onan P220G 20hp Engine Carburetor - eBay (item 190502662980 end time Feb-23-11 19:11:22 PST)

#7 olcowhand ONLINE  

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Posted February 22, 2011 - 06:53 PM

Josh, found a registry of a 446 serial #9694698, and it's a 1970 model, so yours possibly is a 1970, but more likely a 1971 model.

#8 JoshBrown OFFLINE  

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Posted February 22, 2011 - 06:54 PM

No, not a BF. This one is a 20hp with 3 1/4" bore. The BF has 3 1/8" bore. Should have a carb like a B48 Onan, but I can't remember for sure. Get those numbers off the carb & post them, it will help. I think maybe the tractor is a 72 or close to that. I think it has some yellow paint underneath the flambeau red.


I took a picture of all the #'s on everything the # is 146-0384.

#9 JoshBrown OFFLINE  

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Posted February 22, 2011 - 06:54 PM

Josh, found a registry of a 446 serial #9694698, and it's a 1970 model, so yours possibly is a 1970, but more likely a 1971 model.


Ok thanks Daniel

#10 olcowhand ONLINE  

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Posted February 22, 2011 - 06:56 PM

Ok I will check again. I ran the identifying # on it and it said it used a 146-0356 kit that was suppose to be for a generator. I foun one on ebay for $65.00. Onan Generator Carburetor Kit 146-0356 - eBay (item 320649034407 end time Feb-26-11 14:45:15 PST) Does this seem right or would I be better of just buying a one of these for $50.00. Wheel Horse 520-H Onan P220G 20hp Engine Carburetor - eBay (item 190502662980 end time Feb-23-11 19:11:22 PST)


Could well be that carb on your tractor came off a generator, as we got a LOT of parts in that big purchase & put the engine together from it. Looks like the pproper kit. That carb looks pretty good shape. If intending to buy the carb, compare the linkages carefully to make sure all will hook up fine.

#11 NUTNDUN OFFLINE  

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Posted February 22, 2011 - 07:01 PM

Should have a carb like a B48 Onan.


That's what I meant LOL. It has the same carb as the B48 that is in the 448 I have.

#12 JoshBrown OFFLINE  

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Posted February 22, 2011 - 07:03 PM

I didn't know which I would be better off doing. I was going to take a video of it running but haven't yet. It had a broken choke cable I replaced it with one from the parts tractor. I can now idle it way down now without it dying but its like it only hits about 2 times out of five and actually backfired through the carb once. It has me thinking that it might be electrial also.? But I am still probably going take it apart and clean it first and worry about kits and electrical later. I will try and post a video of it later.

#13 olcowhand ONLINE  

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Posted February 22, 2011 - 07:06 PM

I don't think Cecil ever did anything with the points/plugs in the 7 or 8yrs he's had it, so surely needs a tuneup. Yes, clean it all up before laying out any cash. May need no $'s for the carb.

#14 JoshBrown OFFLINE  

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Posted February 22, 2011 - 07:09 PM

Yeah he said that he had not touched the points at all. I have never worked on points at all!!!! LOL I guess it is time to learn.

#15 DH1 OFFLINE  

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Posted February 22, 2011 - 07:10 PM

I'm no expert on Onan's but that look's just like the carb that's on my neighbors Wheel Horse it has an Onan 16hp on it.
Last year it wasn't running right so I took the top off it, (need to disconnect the choke) found crap in the bottom of the float bowel, cleaned it out and it ran OK after that. His had a drain for the bowel which was also access to the main jet.
All this was done without removing the carb.




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