K241 wont run without choke

[Bigsauce]

Hi all,

I've always wanted to get an older cub cadet gt so I finally bought a 105. I've had issues keeping it running though. So here's my best explanation for what's happening with the 105. It cranks and starts while choked half way between fast and slow. It runs for a bit until it warms up. While running it backfires and it looks like the inside of the muffler is on fire. Once it heats up it shuts down and won't start back up until it cools down completely. Also, it will not run unless the engine is choked. While running it does not smoke. I figured it might've been a carb issue so i took it apart and cleaned it out. I checked the fuel system and it delivers gas from the tank and to the carb. I have new points and condenser on it. I sniffed the oil on the dipstick and it had a gasoline/ metal smell to it. I thought I'd ask here since someone may have already experienced what I am working with. Any ideas or suggestions on what to troubleshoot further or what the cause may be would be much appreciated. I look forward to hearing what some ideas may be, thanks in advance.

[Yosemite Sam]

Welcome to OCC.

If it were mine, I would take the carburetor off, take it apart and soak it in carb. cleaner overnight. Then blow out all the passageways (even the tiny little ones inside the throat of the carb.) with an air hose. The high speed needle is hollow and also has tiny holes, the holes need to be clean as well as the inside of the needle. I would then put a "kit" in the carb, adjust the float, put it back together and adjust it as the manual suggests.

Not everyone will agree but I would then time the engine as shown in the tech section here on OCC.

Once running, final adjust the carb according to the manual.

If you feel that the engine is running hot, I would also clean the mouse nests out of the flywheel shroud and engine block cooling fins.

While you're under the hood, also look at the forward side of the engine and see if there appears to be any oily residue coming from in between the cylinder head and the block, it may be time for a new head gasket and to de-carbon the top of the engine and under side of the head. Once clean, sand the head flat (as described in the tech section). A warped head will not seal up and the engine won't run well.

My Brother has been using my 105 for a couple of years now and he just loves it. It is one UGLY machine but it really runs, drives and cuts great.

[ol'George]

I cannot agree more with the previous post!!
spot on!!

[olds45512]

If it takes choke to keep it running then something is plugged, as already stated its time to give the carb a good cleaning and rebuild it. Also make sure the tank is clean and the fuel is flowing freely from it, if there's a rubber hose between the tank and carb I'd go ahaed and replace it because the hose will start to breakdown over time and small chunks of rubber will plug the carb.

[Bigsauce]

Originally Posted by Yosemite Sam

Welcome to OCC.

If it were mine, I would take the carburetor off, take it apart and soak it in carb. cleaner overnight. Then blow out all the passageways (even the tiny little ones inside the throat of the carb.) with an air hose. The high speed needle is hollow and also has tiny holes, the holes need to be clean as well as the inside of the needle. I would then put a "kit" in the carb, adjust the float, put it back together and adjust it as the manual suggests.

Not everyone will agree but I would then time the engine as shown in the tech section here on OCC.

Once running, final adjust the carb according to the manual.

If you feel that the engine is running hot, I would also clean the mouse nests out of the flywheel shroud and engine block cooling fins.

While you're under the hood, also look at the forward side of the engine and see if there appears to be any oily residue coming from in between the cylinder head and the block, it may be time for a new head gasket and to de-carbon the top of the engine and under side of the head. Once clean, sand the head flat (as described in the tech section). A warped head will not seal up and the engine won't run well.

My Brother has been using my 105 for a couple of years now and he just loves it. It is one UGLY machine but it really runs, drives and cuts great.

Thanks for all the information. I'll start by taking apart the carb and soaking it, plus rebuilding it. I've been looking around for a rebuild kit but I can't seem to find one. The carb has two sets of numbers on it one is C-236315 and the other is 235058. None of those return any results for a rebuild kit as far as I've searched. Do you know where I could find a kit for this carb? I'll also take a look to see if the head gasket is leaking, it probably is as the entire block is covered in dried out grease/oil. Again thanks for all the help, I'm looking forward to getting this thing running right soon.

[timbo2]

Welcome to OCC-

Carb rebuild/repair kit Info:

http://cubfaq.com/carbkits.html

I usually find them on ebay under $20

[Bigsauce]

Thanks for all the help guys, I'm gonna clean the carb and rebuild it. I'll keep you all updated as I work on the tractor. Again, thanks.

[Yosemite Sam]

Carb Kits AND the two carburetor gaskets here, https://www.facebook.com/CubCadetand...49696141763776

I'll have to look, I may be sold out, if you want one PM me, and I'll get some more, usually only takes a day or two.

[Bigsauce]

So I've got an update, I cleaned the carb today and made sure all of the holes were clear. I put it all back together and set the high speed needle at 2 turns and the idle speed at 2 1/2 turns and tried to start the cub, but no luck. It cranks, and smells like gas, but wont start at all now. I looked at the points and didn't see a spark so I'm going to attempt to set the timing in the next few days.

[Yosemite Sam]

You might try running a jumper wire from Battery + to Coil +. Then use your 12V test light from ground to Coil -. While cranking the engine, watch the light to see if it goes on and off. Try this with the jumper wire off too.