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John Deere 300 Carb question

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#1 jimbowlie OFFLINE  

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Posted September 01, 2016 - 06:47 PM

Hello again gurus!  I have been having a most difficult time setting the carb on my 300 hydro.  After checking the number on the carb itself, I came up with 47 053 15.  When cross referencing with Kohler numbers I am left with a wrong number for the K341AQS.  47 053 15 is reported to belong to K321 (M14), NOT the K341AQS (16hp).  Do any of you know if this is true or how it impacts the operation of this motor?  The problem I am having is the high and low idle settings.  The K341AQS is reported to require carb number (kohler) 45 053 68 (above 180000) high idle 3.5 out with low idle 2.5 turns out.  The K321 setting is close 3.25 turns out for high and 2.5 turns out for low.  Still, I can't help but wonder what I am loosing from optimal operation with this carb....  Or, does it even matter in the end.

Edited by jimbowlie, September 01, 2016 - 09:54 PM.

#2 lyall OFFLINE  



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Posted September 01, 2016 - 07:34 PM

here are the start settings

carb settings.png


it make a different which carb you have.


There are different carb (Carter),  inside the throat of the carbs there is a number 26,28, or 30

the 26 works best on the 10m 12 and 14 hp.  the 28 is for the 14 and the 30 for the 16 hp

using a 26 on a 16 hp (k341) it might not be getting enough air flow.

I have used the 30 on 12 and 14 hp motor and have to adjust the high and low settings down below the in the pic to make them run right.


the primary settings are just a setting to get the motor to start and run.  Then you need to make adjustments.

Each motor I have worked all act differently.  They are just like kids.

Edited by lyall, September 01, 2016 - 07:46 PM.

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#3 jimbowlie OFFLINE  

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Posted September 01, 2016 - 10:20 PM

I have gone with the premise that the carb that came with the tractor was original.   77 is a long time ago for any carb as it is pushing 40...lol  All the info I have gathered pointed to 30mm (1.2") into the throttle bore.  The number on the carb would make me think it is ideally set for a 14hp.  When I look on EBAY I see so many people trying to sell 14/16 hp carbs. as interchangeable (to which I am skeptical).  I assumed this carb was 30mm because it was on the tractor when I got it.  Maybe some 14hp used the same carb 30mm throat making it a later replacement to both 14/16hp motors.  I don't know..  I have the same print out lyall has and it is where my investigation started.  Thank you lyall for providing it to reinforce my belief to this point.  I figure I will just buy a new carb and see if that helps.  I replaced all parts on the carb I have with the exception of the needles.  Still, I hate stabbing in the dark.   I do have a carb on my M18 I considered reducing its settings to try out, but figure that could easily head south quickly...

#4 Trav1s ONLINE  


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Posted September 02, 2016 - 10:17 AM

Ok, here is how I understand the Carter/Kohler carbs to match up:


26 = k241-10HP & k301/12HP


28 = k321-14HP (28s are HARD to find)


30 = k321-14HP & k341/16HP


When cleaned and tuned the Carter/Kohler carbs paired with the K series makes a dependable and powerful machine. Don't give up on it yet. I set the baseline according to the manual and adjust following the procedure in the manual.  Listen and when you get them dialed in you will know it.

Edited by Trav1s, September 02, 2016 - 10:19 AM.

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#5 KennyP ONLINE  



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Posted September 02, 2016 - 11:00 AM

The Kohler Carb Reference manual says the 47 053 15 is for the K321 (14HP). It is not big enough for the 16 HP K341. Someone has swapped it at sometime!

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#6 jimbowlie OFFLINE  

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Posted September 03, 2016 - 10:08 AM

Now that is what I thought KennyP....  But, when I look to purchase another all sites describe the carb as K321/k341 and M12/M14.  In addition it is a 30mm so air mixture should be sufficient.  The problem I have with my carb after kit repair is I can not get full throttle, (as if it can not get enough air/fuel to get full).  Before the kit I could get full  throttle (though it felt I was not getting all potential power).  I thought maybe the governor slipped so I reset it.  Now I can't get top end anymore, (not even what I used to get).  Only 2 changes would lead me to believe it is one of these that are causative.  I even tried to adjust the spring to see if that would make a difference.  Smoothed out the low end but still no top end.  Now I see there is one more element to add to the mix.....  ME.  I must be the problem...lol

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