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9n runs rough

A

Anonymous-0

Well-known Member
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
 
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.

post back
 
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
 
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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