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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

9n runs rough

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sixpack

11-20-2013 04:16:43
50.51.21.210



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My 9n starts ok, but runs terrible unless I keep the choke pulled out. If I warm it up for 15 min. it gets better, but still rough. HELP




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sixpack

11-20-2013 09:18:06
50.51.21.210



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 Re: 9n runs rough in reply to sixpack, 11-20-2013 04:16:43  
Thanks for all the suggestions. Adjusted to carburetor to one and a half turns , cleared the plugs and it runs great. The adjustment screw must have vibrated over the years. Thanks again



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soundguy

11-20-2013 12:49:54
108.112.153.185



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 Re: 9n runs rough in reply to sixpack, 11-20-2013 09:18:06  
glad she's running for you.



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old

11-20-2013 07:27:12
209.86.226.11



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 Re: 9n runs rough in reply to sixpack, 11-20-2013 04:16:43  
I'll add to what Sound said. When you check spark make sure it is a blue/white and will jump at least a 1/4 inch gap or more. Having the choke it some to make it run better is a sign of weak spark some time.
#2 Check your air cleaner and make sure it has good oil not water and mud in it.
#3 pull the crab drain plug and make sure you have a good steady flow of gas for a couple minutes. Catch it so as to look for dirt and water etc. Then try opening the main jet a little at a time til you find a sweet spot. When it is cooler out you need a bit more fuel to run well.
#4 check your spark plugs you may find you have some that are fouled. If so replace them with auto lite 437s

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soundguy

11-20-2013 05:28:37
108.112.48.79



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 Re: 9n runs rough in reply to sixpack, 11-20-2013 04:16:43  
Start with the basics.

Even though this may end up being a fuel issue.. since it is so easy.. go ahead and check spark at all 4 plugs. if spark is good on a spark checker tool, or holding wire near block.. then go ahead and pull plugs and check them. never know.. might have a fouled plug. clean and regap the plugs. if spark was good and didn't need cleaning, or clening provided no change, then move on to fuel.

make sure you have a good flow thru carb. if so, screw the main in and count.. if it is less than 1.5 i'd say lets go back out to 1.5 and then try 1/8 turn out testing throttle and richen it a bit and retest.. if you get past 2 turns out and still bad, yet runs ok with choke, ad otherwise has good power, I'd reccomend to pull the carb down for a good cleaning.. dip then spray out and run holes with fine wire / guitar strings.. etc. go in with a new gasket. make sure choke flapper is good and not loose.. sme with butterfly.. etc.

make sure you clean the gasket surface at carb halves and carb to manifold.

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