Need some help with a "HOT" 10 horse...
 

Hi everyone, I have a K241 that is running really hot. Blowing fire into the muffler, and cooking all the paint off. What could be going wrong? It starts and runs great until it warms up, then it only runs good with the choke pulled half way out. Any ideas? I need to address the problem tomorrow, or Saturday at the latest. The engine in is one of my "Little" tractors. I'll post some pictures in the custom area this weekend.

Any help or advice would be GREATLY appreciated. The tractor is leaving for Nebraska Sunday afternoon, so I need to figure this one out quick.

Kurt

The way it sounds i would say it's running lean.

I agree, If you have to pull the choke out to make it run right, its not getting enough fuel on its own. Or you somehow are getting to much air. If the carburetor is clean and adjusted right then check for leak around the intake gasket or the head gasket.

Can you post or send me a picture(s) of the exhaust system?

My Dad tried to run a straight on his narrow front Cub. The Cub had a cap with holes drilled in the cap to help quiet the engine in the middle of the exhaust system. He had some overheating problems and it took longer for the engine to speed up.

He removed the cap and installed a muffler from a Farmall Cub and the motor has been running good since them.

Thanks for the ideas everyone.

This is the exhaust system. It's stock Cub Cadet except for 2-90 degrees and some pipe...

I played with the carb adjustments, but honestly, I've never been too good adjusting carbs...

Last night I played with the timing a little, and now it's not exhausting orange fire, only a little blue... I'm more than a little frustrated right now. A friend thought it may be sparking too late, and that's why it's coming out so hot. I'm going to get a new set of points this morning and see what can be done with them.

I'm hoping this morning will bring better luck.

Kurt

Being a HVAC/R Tech and dealing with piping & ducting, those two 90° Elbows are causing a partial restriction. I would suggest up sizing the diameter of the pipe & fittings leaving the muffler.

As a TEST, remove the piping arrangement from the muffler outlet and beyond, and see if the heat diminishes.

Wow...
 

Did this just change, or has it always been this way? Looks like the carb was recently rebuilt too. If it was good before you started changing things, it's probably not the points.

Get the timing set dead on, then ~2 turns out on the mixture screws should be in the ballpark. If you set them to that range, what happens?

John

"High Test" or 93 octane fuel burns slow, same as changing the timing.

What fuel are you using?

I think I read one manual that called for 85 octane!! :bigthink: I can't get anything lower than 87!!

:bigeyes:

hot 129
 

Hi everyone. I'm having the same problem with my 129 . Rebuild the carb. Decorboned the head. Found out its bored .30 over. Got it running and the muffler glows. Trying to adjust the low idle. I have hydro lift off a 149 on her was wondering if they need to be in a certain spot..? Up ? Down ? In the middle?? Thanks

Well I found out I was running lean. I put a fuel bowel on her a while back. It wasn't letting enough fuel in the carb. So I put a different one on and now its running great..thanks for you help

Glad you found the problem, at least it was a simple fix:beerchug:

Well said!

Thanks for all the replys. I fixed it today... I stopped at a Cub dealer and picked up a set of points on the way to the shop this morning, and it worked!

Everything is good to go. Installing some decals tomorrow, loading, and it'll leave for Nebraska Sunday afternoon.

Kurt

I agree It sounds like a lean mixture condition but other possible solutions
You may have a exhaust valve sticking ( slow to return ) , my 9n ford is notorious for it and does the same thing you talked of , if it even has compression to run
old fuel will do this every time and you might have a burnt exh. valve by now or a loose guide
I see you are in MI possible carb icing ? it happens in seconds




:bash2:
128

Hey am glad you got it fixed. I would have been all over the carb and fuel delivery due to a lean condition making the exhaust hot. What made you decide on points? :bigthink: I'm just trying to keep ideas that work in my little black Cub book. :)

Great news, Kurt! :beerchug:

exhaust
 

i would say you have a exhaust valve problem check the clearance and reseat it lap it with valve gringing compound,