1250 just won't run... I dunno

IHC Cub Cadet Forum -- Questions and answers to all of your Cadet related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.

1250 just won't run... I dunno

Postby Matt Kirsch » Sat Jul 03, 2010 7:11 pm

Guys, I am starting to wonder if there isn't something non-standard wrong with this 1250.

It just won't run right for love or money.

The engine just LUGS down and quits. It's like someone chained it to a tree.

It sounds the same as when I push the speed lever to full forward.

It's got plenty of fuel flow to the carburetor.

Tank is clean as a whistle inside.

I pulled the bowl off with the carburetor on the tractor and the needle is no longer sticking. Works fine.

The bowl was full of fuel when I pulled it off.

Fuel gushes out the needle when I open the tank shutoff with the carb bowl removed.

Opening the high speed mixture any further causes the engine to cough and blow black smoke.

It will sit there and run at wide-open for a random length of time, then LUG down and die.

It fires right back up and will run at full throttle immediately after it dies.

Guys, I've done my due diligence here. I really really really don't think the carburetor is the issue.
Matt Kirsch
501 Club
501 Club
 
Posts: 3187
Joined: Tue Jun 08, 2004 3:04 pm
Location: Rochester, NY
Zip Code: 00000
Circle of Safety Award
Circle of Safety: Y

Re: 1250 just won't run... I dunno

Postby BigBill » Sun Jul 04, 2010 12:51 pm

It sounds to me to be a gas flow problem? Your running out of gas then it stalls and the gas flow will catch up and it restarts. Is your gas line clogged or slowing down the gas flow? Is the gas hose kinked somewhere?

On one tractor i found a rubber band stuck in the fuel bowel inlet on the gas tank side. The 147 was doing the same thing starving for gas. You could have dirt inside the bowel housing were we can't see it were the inlet is near the shut off needle.

If the above is ok the needle in the carb maybe sticking enough to still cause a problem. Is the float drop ok? (distance)
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.
BigBill
501 Club
501 Club
 
Posts: 5632
Joined: Sat Jul 22, 2006 5:02 pm
Location: in northern usa
Zip Code: 00000

Re: 1250 just won't run... I dunno

Postby Paul B » Sun Jul 04, 2010 9:12 pm

Does this have an inline fuel filter on it by any chance? If so, make sure is is one designed for a gravity flow fuel system, and not one designed for use with a fuel pump. A filter for a fuel pump system will not flow enough fuel in a gravity system, and [b][i]can[i][b] cause a problem like you describe. The engine runs out of fuel and dies, and by the time you restart it it has filled the line/carb bowl up again and will run until it runs out of fuel again, etc, etc.
Paul B
Team Cub Guide
Team Cub Guide
 
Posts: 2338
Joined: Sat Apr 10, 2004 6:12 pm
Location: KY, Louisville
Zip Code: 40218
Circle of Safety Award
Circle of Safety: Y

Re: 1250 just won't run... I dunno

Postby Matt Kirsch » Tue Jul 06, 2010 7:52 am

No fuel filter. Just a hose from the shutoff valve to the carburetor. Less than 12" total length.

There is a steady fuel flow from the tank when I run it into a bucket. It's a 3/8" line and was running about half full.

I let half the tank of fuel flow out into a bucket. No problems there.
Matt Kirsch
501 Club
501 Club
 
Posts: 3187
Joined: Tue Jun 08, 2004 3:04 pm
Location: Rochester, NY
Zip Code: 00000
Circle of Safety Award
Circle of Safety: Y

Re: 1250 just won't run... I dunno

Postby wdeturck » Wed Jul 07, 2010 4:18 am

Did you have the gas cap on or off when you checked fuel flow? the gas cap air vent can be clogged. with a 3/8 hose it would drain but if you hook it to the carb it won't feed if the vent is blocked. Try loosening the cap with it running.
The Geezer from IHregistry.com which crashed and is now Cub Cadet Collectors.
User avatar
wdeturck
501 Club
501 Club
 
Posts: 949
Joined: Mon Dec 08, 2003 6:15 am
Location: PA Oakmont 15139

Re: 1250 just won't run... I dunno

Postby SundaySailor » Wed Jul 07, 2010 9:00 am

Matt,

I ran into a similar problem with my 1200. Pretty much the same setup as yours. These are gravity flow types of garden tractors. I had replaced my gas line hose as part of the rebuild, and actually cut the hose a little too long. From standing up, it looked to be ok. But, if you were sitting next to the tractor on that side, you could see a slight upward bend over the carb at the input.

This upward bend would cause less gas to flow especially when driving up a slight incline. It almost drove me crazy since I'd also rebuilt the carb, and didn't have this kind of problem to start with.

As they say, check the simple stuff.

Oh, on the needle valve. My new Kohler kit did come with the brass needle and seat. It was a bit sticky out of the package. Nothing a bit of electronic cleaner/acetone and a quick burnishing of very fine sand paper didn't take care of.

This thing runs like a bridled horse now!
Though trillions and trillions of eyes have been watching the skies for as long as human memory exists, no gods nor angels have been seen or documented outside of religion. The number of spaceships being sighted however has become much more prevalent.
SundaySailor
501 Club
501 Club
 
Posts: 978
Joined: Mon Jun 28, 2004 1:45 pm
Zip Code: 00000
Tractors Owned: 1950 Cub
2000 Simplicity Landlord DLX
1988 JD 322 Garden Tractor with hydraulic scoop, 54" scrape blade and 48" mower deck, Haban 3 pt hitch sickle bar mower

Re: 1250 just won't run... I dunno

Postby Eugene » Wed Jul 07, 2010 9:21 am

I've had hose problems similar to Sunday Sailor's. One was kinked hose. Another was an upward bend trapping air in the line.

On another tractor, part of the hose interior was loose. When the hose was installed - blocked the carburetor inlet.

Sticky needle valve. I bench test carburetors using rubbing alcohol.
Eugene
Team Cub Mentor
Team Cub Mentor
 
Posts: 12125
Joined: Fri Jul 02, 2004 9:52 pm
Location: Mo. Linn
Zip Code: 65051
Circle of Safety Award
Circle of Safety: Y

Re: 1250 just won't run... I dunno

Postby Matt Kirsch » Wed Jul 07, 2010 11:56 am

Loosening the cap doesn't affect fuel flow.

Fuel hose is original. Runs straight forward, makes a bend, then straight into the carburetor. No kinks or upward stretches.

I'm really starting to think that I'm chasing my tail here...

Since it fires right back up with no cool-down, it's not a bad coil, but what if it's ELECTRICAL?

One thing I noticed is that right before the tractor starts to lug down, the ammeter starts dropping back toward discharge.
Matt Kirsch
501 Club
501 Club
 
Posts: 3187
Joined: Tue Jun 08, 2004 3:04 pm
Location: Rochester, NY
Zip Code: 00000
Circle of Safety Award
Circle of Safety: Y

Re: 1250 just won't run... I dunno

Postby gitractorman » Wed Jul 07, 2010 12:06 pm

Matt,
This is a long shot, but try disconnecting the drive shaft and running the engine. There is a chance, don't really know the reason, but the hydraulic pump could be building up pressure and/or failing, and bogging down the engine. It is easy to do and would rule out the pump.

Next I would do a similar test with the PTO, take off the mule drive belt and see if the engine acts differently.

Bill
1951 Farmall Cub, Cub Cadets 102, 104, 1811, 1864, Simplicity Legacy XL 4x4 Diesel with FEL, 60" mower, 50" Tiller
User avatar
gitractorman
501 Club
501 Club
 
Posts: 2026
Joined: Mon Oct 24, 2005 11:35 am
Location: Grand Island, NY
Zip Code: 14072
eBay ID: toysforjake
Tractors Owned: Lots of Cub Cadets!
1951 Farmall Cub
1977 IH Cub
1966 IH Cub
1965 IH Lo Boy
1949 Farmall Cub
Several IH 154 Lo Boys
1979 IH 184 Lo Boy
Simplicity 4416 Sovereign
Simplicity Conquest
Simplicity Legacy 4x4 Diesel
Circle of Safety Award
Circle of Safety: Y

Re: 1250 just won't run... I dunno

Postby jim turner » Wed Jul 07, 2010 12:40 pm

I don't think I would rule out coil and or condensor
Jim Turner
jim turner
501 Club
501 Club
 
Posts: 1562
Joined: Sun Feb 02, 2003 1:09 pm
Location: Mo, Sheldon
Zip Code: 00000
Circle of Safety Award
Circle of Safety: Y

Re: 1250 just won't run... I dunno

Postby bandit86 » Wed Jul 07, 2010 5:25 pm

is there no governor on these?
1220 cubby
bandit86
Cub Star
Cub Star
 
Posts: 115
Joined: Sat May 26, 2007 9:34 pm
Location: London, Ontario

Re: 1250 just won't run... I dunno

Postby wdeturck » Thu Jul 08, 2010 4:35 am

To Eliminate the Electrical possibility get an inline spark tester at Harbor Freight to watch the spark when it's running and just put a jumper wire from the Battery to the + coil when the engine is running then turn the key OFF. The only electrical will be the battery ,coil & Condensor and points and spark plug & wire and if it lugs down the problem is in the VR or the key switch. It will run a long time on a charged battery and you can watch the spark.
The Geezer from IHregistry.com which crashed and is now Cub Cadet Collectors.
User avatar
wdeturck
501 Club
501 Club
 
Posts: 949
Joined: Mon Dec 08, 2003 6:15 am
Location: PA Oakmont 15139

Re: 1250 just won't run... I dunno

Postby Matt Kirsch » Thu Jul 08, 2010 11:46 am

Well, I'm halfway there... The previous owner had an unintended acceleration event with his Lexus and bent the heck out of the mower deck and lift mechanism. All that's been removed now.

Looking at the coupling between engine and transmission, I can see the engine is sagging in back. It's not a straight shot. Pulling the coupler is next.

Unfortunately, I forgot to disconnect the battery, and left the key on. Battery's dead.
Matt Kirsch
501 Club
501 Club
 
Posts: 3187
Joined: Tue Jun 08, 2004 3:04 pm
Location: Rochester, NY
Zip Code: 00000
Circle of Safety Award
Circle of Safety: Y


Return to Cub Cadet Forum

Who is online

Users browsing this forum: No registered users and 2 guests