682 problem

[ramman16248]

I recently had the carb rebuilt on my 682 by a guy who is really good on carbs. ( He has done a few in the past for me and I was extremely pleased with the outcome). It ran fine when I got it home. I used it a couple of times mowing once and dirt blading with the snow blade. ( Maybe less than 1 tank of fuel). It sat for 2 weeks untouched. The next time I went to use it, the weather was a little colder, but not cold. ( Sweatshirt, not coat wearing cold). The tractor was difficult to start. It only ran with the choke pulled 1/4-1/2 way out. It ran fine then. Fast forward 3 more weeks. I bought a barn find 48 Plymouth. I loaded the 682 on the trailer in case we needed it to help pull the car to the trailer. The tractor wasn't needed, so I loaded it in the back of my truck and it stayed there for 2 weeks parked outside my garage. When I started it to load it in the truck, it started ok, but now the choke needed to be half way out to keep it running. It didn't miss or backfire or anything, just would run unless it was halfway out.
Now after 2 weeks sitting outside on the back of my truck, I can't get it to fire and run for more than 2 seconds. Those 2 seconds are probably from the starting fluid that I shoot down the carb. It will run good until the fluid runs out. ( Anywhere from 2-10 seconds.) Could the carb be screwed up, or possibly a fuel pump? I know I turned it over until the battery weakened, and I don't think it smelled flooded at all. Most Cubs I had in the past would have smelled like a fuel spill by this time. Where should I look first? Thanks, Jason

[R Bedell]

Sounds like a fuel delivery problem.

Starting at the tank. Is the fuel fresh & clean? Then next to the Shut Off Valve (#2). I don't recall if this valve has a fine mesh screen on it or not. If it does, is it clean? Next I would look at the inline Fuel Filter (#8). Does it need to be replaced? Then on to the Fuel Pump. Is it pumping? Lastly, make sure all the fuel lines are clear and free flowing.

[Vince_o]

What Rolland said and maybe a little more.

When Rolland typed of the fuel line, look at your filter, do you have small black specs in it, fuel lines tend to rot from the inside out.

There should be a small screen on the shut off valve

lets keep it simple, run the carb back to base settings, first, then see if it will run. Pull the bowl and see if theres sedment in it.

PLEASE dont use starting fluid in you small engs, youll destroy the eng faster than running it with out an air filter! Yes something thats not so hot, like carb cleaner.

[R Bedell]

Pull the bowl and see if theres sedment in it.

Vince....there are no sediment bowls on the 82 series, hence the inline filter.

[weaverama]

Perhaps Vince was referring to the carb bowl. I have two tractors with fuel filters and regardless, the fuel bowl has accumulated a syrupy white goo when they have set for awhile. Perhaps its a symptom of Ethanol.

[R Bedell]

Perhaps Vince was referring to the carb bowl

You could be right. I dismissed this since it was stated that the Carb was just rebuilt.

[CHWNY]

weaverama, I think you'r right on that Ethanol. That stuff clumps up worse than Hy-tran!

[ramman16248]

Ok guys Thanks for the replies. I will start tracing the line back. IF the screen is dirty, how should I clean it? I can replace the filter, but is the screen in the tank itself?

[Vince_o]

Sorry, Im a little out of my mind fuel bowl, Ive had a temp of 103 for the last day and half.

To replace that screen, you replace the shut off valve. when you do that replace the rubber gromet with it.

Oh the ethonal. We see so much of it here in the shop. I tore a Kawasaki trimmer apart the other day down to the crank, ethonal damage. Ill take some pics today if the carbs are still here of what we see. Most are home on my comp and not on my comp here at work.


Remember start out with a K.I.S

Keep It Simple in you diagnose of a problem. The simple things are most over looked.

[R Bedell]

I was my understanding, that Kohler revised their Carb Kits with newer type of gasket material(s) to accommodate the Ethanol issue.