8N Fuel issue.

[jthornton7771]

I recently purchased a 9N with a 8N motor. Drove the tractor home and mowed half of the following day with no issues. After lunch, I started the rig, drove approximately 50 feet before it died. I reached out to previous owner who suggested carb over haul. I bought the rebuild kit only to find out that the jets were stuck in the carb to the point that they couldn't be loosened without stripping the heads off with a screw driver. I bought a new carb off of ebay, and installed it. The tractor fired right up and tuned perfectly, UNTIL I put the engine under load (placed in gear or engaged PTO) at which point it died. I've replaced fuel filter, rubber fuel line, in line fuel cut off switch, spark plugs and no improvement. Please help me! Thanks

 

[Abbby]

#1 - Did you adjust the main jet on the new carb? Symptoms indicate running lean. Turn main jet out 1/4-/12 turn until it runs good under load. Small adjustments.
#2 - There should not be a rubber fuel line on this tractor. Replace with the correct metal one which can be bought on this site
#3 - This tractor should have three fuel filters. One screen in the tank which can only be cleaned by removing sediment bowl assy. Another screen that can be cleaned when removing the sediment bowl and a third in the carb inlet that can be cleaned/replaced by removing the 90 deg inlet.
#4 - The original carb is much better then the new cheapo's. If you are careful you should be able to drill out and remove the jets that are stripped. If you are not comfortable doing that you can send the carb out to a couple guys on this site for rebuild. Unless it is really bad they should be able to get it done.

 

[Bruce (VA)]

I bought a new carb off of ebay,

Never a good idea.

Best send that oem carb out for a rebuild.
75 Tips

 

[jimtrs]

(quoted from post at 07:09:17 04/28/22)

.... I reached out to previous owner who suggested carb over haul.

I bought the rebuild kit only to find out that the jets were stuck in the carb to the point that they couldn't be loosened without stripping the heads off with a screw driver

I bought a new carb off of ebay, and installed it

Please help me!

J, Slow down.

The way to solve issues with your tractor is to diagnose the problem, then repair that. A "guess" from someone over the phone is not a diagnoses.

Re your jets: These don't necessarily have to be removed for a good cleaning, helps, but better off not damaging them. And by the way, yes, even stubborn jets can usually be removed, just need to know ways. Learn by asking.

As said, ebay carbs (aftermarket) are usually junk.

If you want to learn mechanicing on your old tractor, ask & learn. Don't assume.

 

[Jim L WA]

It may not even be fuel related. Did you notice if the ammeter was showing a charge during your half day of mowing? Have you measured the battery voltage?

 

[lha]

You might check the key switch. They do sometimes go out intermittently,causing problems.

 

[jthornton7771]

Thank you for your advice. To clarify, I first thought of fuel filter (always check the easiest thing first), I replaced it with a WIX 33001 which didn't help. I drained the fuel from the old carb, thinking that it may be debris in the bowl, that didn't help. I checked the screen on the sediment bowl, they poked a hole in the screen so that the fuel would bypass it. My suspicion was that she wasn't getting enough fuel to the carb because the fuel filter never filled beyond 1/3 full, even when running. So I removed the the plastic inline fuel shut off valve and replaced the paper fuel filter with a Screen/mesh fuel filter, still no luck. I checked for spark at the plugs, I have a nice blue spark although not like the 1/4 inch spark that someone else suggested. I have a steel fuel line on the way, and a new sediment bowl so hopefully that will help. My reasoning for changing parts was because this is a 3rd hand tractor and most people use inferior parts to improvise and get the job done. I figured that it would need filters and plugs soon anyway. sorry for the long response, hopefully this will help you help me.. lol Thanks Again!

 

[Eman85]

Sounds like a lot of parts buying and guessing. You can end up compounding the problem doing this as the parts you buy might not be as good as what you replace.
It sounds like you were on the right trail when you started to check fuel delivery. These tractors were built for simple farmers with no money to buy parts so they made them easy to diagnose. The fuel flow test by removing the plug at the bottom of the fuel bowl would show you if you had clogged fuel screen or shutoff.

 

[Jim L WA]

You said, "..... I checked for spark at the plugs, I have a nice blue spark although not like the 1/4 inch spark that someone else suggested."
The color of the spark isn't important. It's the strength of the spark that is important.