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FF 18 only runs well in high choke


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#1 Dfmooresr OFFLINE  

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Posted April 26, 2017 - 12:03 PM

I recently bought an FF 18. It is quite a workhorse. The only issue I have is that it only runs well when the choke is mostly pulled out. If the choke is in, it runs rough. Any suggestions on what could be wrong and how to fix it? Thanks.

Edited by Dfmooresr, April 26, 2017 - 12:03 PM.

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#2 TAHOE OFFLINE  

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Posted April 26, 2017 - 12:53 PM

I recently bought an FF 18. It is quite a workhorse. The only issue I have is that it only runs well when the choke is mostly pulled out. If the choke is in, it runs rough. Any suggestions on what could be wrong and how to fix it? Thanks.

 

Carb needs removed and cleaned thoroughly, probably varnished up from sitting. Sometimes it takes 2 or3 cleanings to get it right.


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#3 637Yeoman OFFLINE  

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Posted April 26, 2017 - 02:06 PM

Plugged jet(s) 

Give her a soak in some chem dip or laquer thinner. Dont be lazy and take the easy way out, and do a crappy job cleaning.

Then youll just have to take it off and clean again.


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#4 Bill 76 OFFLINE  

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Posted April 26, 2017 - 02:19 PM

What they said , also put a new gasket between carb and engine to eliminate vacuum leak. 


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#5 EricFromPa ONLINE  

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Posted April 26, 2017 - 04:04 PM

Clean the carb Really well and replace the spark plugs. Running to lean Or rich will foul plugs. if it still runs like crap Replace or rebuild the Fuel pump.

 

 

Actually I would Rebuild the fuel pump 1st. It's a Briggs opposed twin thing lol. Rubber Diaphragm in the fuel pump gets stiff over time and they don't pump enough fuel up to the carb. Especially with this crap Ethanol fuel.

 

Carb kit with fuel pump rebuild kit are usually around $20.


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#6 Dfmooresr OFFLINE  

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Posted May 02, 2017 - 01:35 AM

Where would I find a carb kit and fuel pump for this old tractor?
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#7 MH81 OFFLINE  

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Posted May 02, 2017 - 01:40 AM

I would try one of the site supporters.
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#8 Buck Tales OFFLINE  

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Posted May 13, 2017 - 06:29 PM

Ditto on the site supporters, they have helped me many times.


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#9 indslpwr04 OFFLINE  

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Posted May 26, 2017 - 10:41 AM

All these small carbs suffer from too much air from old gaskets leaking.  Basically with the choke all the way off, The engine is sucking way to much air in from all the other leaks,  Check all the intake gaskets by spraying a little staring fluid on each one.  Also another areas is around the throttle shaft bushings.  I got my original Onan 18 carb as good as it can possibly get but still have to slightly adjust the roughness with the choke because the bushings are worn and i haven't found a place to get new ones.  A complete carb rebuild kit with brass float will save you many headaches,  Change any rubber line as well,  


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#10 Dfmooresr OFFLINE  

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Posted September 03, 2017 - 02:05 AM

UPDATE: It has been awhile since I last posted but I did rebuild the carburetor and fuel pump. A neighbor helped me tune it up and I must say it works like it is supposed to. Runs well with the choke pushed in like it is supposed to rather than running with the choke all the way out. Thanks for all the suggestions.
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