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  #1  
Old 04-24-2012, 05:54 PM
mergg mergg is offline
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Default 18 hp kohler
Hi guys I bought a2186 last fall with a kohler ch 18 can't cure the rough idle.I rebuilt carb ,adjusted idle mix , new spark pugs, new ful filter,air cleaner. Any ideas Thanks
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Old 04-24-2012, 07:50 PM
Vince_o Vince_o is offline
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Im guessing the emulsion tube is clear?

dose it go away when you turn the deck on?

Will it run smooth at top no load speed?
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Old 04-24-2012, 08:35 PM
mergg mergg is offline
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If you mean fuel line it seems to be because gas flows out of the fuel pump discharge line although i don't what the pressure should be and it does run ok at full speed no load but when i drive it i feel a slite miss. thanks for the reply
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Old 04-24-2012, 08:57 PM
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Sam Mac Sam Mac is offline
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Vince is talking about the very small holes in the tubes that mix gas and air inside the carb. If you cleaned them when you rebuilt it try some fresh gas and some Sea-Foam. You also may have a coil going bad, ask me how I know about that. Was going to say you could have a bad SAM but the CH18 doesn't have that consider yourself lucky. Does it act better if you pull the choke out just a bit, if it does you probably still have crap in your carb. Hope this helps.
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Old 04-24-2012, 09:20 PM
Vince_o Vince_o is offline
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Wow I thought you were going to say holes in my head, LMAO!
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Old 04-25-2012, 08:18 AM
Vince_o Vince_o is offline
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Lets see if I can upload from work
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File Type: jpg AIR FILTERS 002.jpg (13.4 KB, 165 views)
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  #7  
Old 04-25-2012, 07:34 PM
mergg mergg is offline
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Default kohler 18
So thats an emulsion tube! YES I cleaned it with a torch tip cleaner.And pulling out the choke does not help. Forgot to try running mower deck .I bought a bottle of starbrite gas treatment and am trying that Thanks to all for the advice will watch for more
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Old 04-25-2012, 07:37 PM
Vince_o Vince_o is offline
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The reason I asked about the deck is that when the deck is on your useing the main jet, away from the idle circit and top no load, deck or plowing ect, is still using the idle circuit.
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  #9  
Old 04-26-2012, 04:34 PM
mergg mergg is offline
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Default kohler 18 hp
Itried ildeing with deck ingauged ,no better?
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  #10  
Old 04-27-2012, 06:24 PM
orphie orphie is offline
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Sam Mac:

Yes, please enlighten me !

You also may have a coil going bad, ask me how I know about that.
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