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carb problem 8n...


 
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dave404
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Joined: 20 Mar 2012
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PostPosted: Sun Jun 30, 2013 6:31 am    Post subject: carb problem 8n... Reply to specific post Reply with quote

I have to choke quite a bit to get it started. once started it still don't sound too good. a lot of put,put. ive took carb apart and its extra clean. where it mounts to the intake is really cold and a lot of moisture on outside, maybe this is normal for cast ?? or a problem ?
 
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Bruce (VA)
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Joined: 24 Feb 2003
Posts: 12922
Location: Old Church VA

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PostPosted: Sun Jun 30, 2013 6:41 am    Post subject: Re: carb problem 8n... Reply to specific post Reply with quote

It's called carb icing & is a natural occurrence driven by air temp & humidity. Make a carb heater out of tinfoil.

But that's not likely causing your problem.

While each N has it's own starting sequence, none of them will start well by just yanking out the choke rod & holding it out for 5 or 10 seconds while the engine cranks. This is an updraft carb w/ a gravity fuel system; it is by it's very nature subject to flooding. Too much choke makes it happen.

Try this:

Key on, gas on 2 full turns, clutch in, 3/4 throttle, press the starter button. Let it crank for at least 3 - 4 seconds before you pull the choke rod. Then, don't hold it out for more than 2 or 3 seconds.

If you find out it will not start w/o excessive choking, you have problems

Try adjusting the carb.

Make sure the tractor is at operating temp; that usually takes 10 15 minutes at idle depending on ambient temp.

Both Ford and Marvel/Schebler (assuming you have a M/S carb ) say to set both the side-pointing idlemix and the down-pointing mainjet to 1-turn as a starting point. I set the down-pointing mainjet to 1-1/2 turns and don't fool w/ it until the final step.

Then adjust the side-pointing idlemix for fastest idle; not the smoothest idle. Next, adjust the behind the carb idle-speed set-screw for very slow 400-rpms idle. Do that idlemix adjust for maximum idle at least 3-times. Make sure that you turn the screws slowly, like 1/8 of a turn at a time & wait a second or two for the engine to catch up. Take your time!

Do it like this:

1. Adjust idle mix jet until RPM increases

2. Adjust idle-mix set screw until the engine nearly stops (as slow as you can get it unless you have a tach that tells you 400 rpm)

Repeat steps 1 - 3 three times.

Remember the side-pointing idlemix is out for lean, in for rich.

If you do not have any problems inside the carb, it is easy to get the idle down to 350 - 400 rpms.

Your last step is to go back to the main jet. Remember, in for lean, out for rich. If you end up turning it OUT more than turn for max power (remember, you already had it 1 turns out) then stop right there because you have a dirty carb or a fuel problem.

Lastly, each of us has his own definition of a carb rebuild. If taking it apart & seeing that it was clean is all you did, that didn't get you much because you need to soak the carb 24 hrs in a bucket of caustic carb cleaner & blow out every orifice w/ a rubber tipped air gun.
75 Tips

 
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NOXJohn
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Joined: 22 Apr 2008
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PostPosted: Sun Jun 30, 2013 8:40 am    Post subject: Re: carb problem 8n... Reply to specific post Reply with quote

Also check your points, rotor and cap.
 
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