trouble shoot 1650
 

hi all,

Ok, I got the trans fluid changed AND filter. Took the mower deck off awhile ago but I put it back on without major problem. It was my first time putting one back on and I think I did pretty good at it. Prior to this the tractor has been running decent since I bought it without any real maintenance on it yet. Only ran it a few times to shovel snow. Still some white smoke coming out but seems to clear up after letting it run.

After the fluid change and deck back on I wanted to go out and mow some lawn to see if I got everything set correctly. She ran but kept backfiring and smoking badly. I could feel the heat(and smell burnt oil) from the engine and she seemed to run smoothly at half throttle(a few times). She quick on me a few times hards. Fed up I decided to quit for the day. After doing some grilling I wanted to try her out again for the hell of it. This time she ran great and I got the lawn mowed!:bigthink::bigeyes: Ok well at lest that time she work. :biggrin2:

I want to make a note that I added some really good star-gon fuel treatment to the gas. It only takes one ounce to EVERY 3 GALLONS! I dont know if this is what caused all the bad backfiring, white smoke, vibrations, etc or not. :banned: Anyhoo she worked good the second try. lol

My next plan of attack I think I want to tackle the carb, points and condenser. New Oil, air filter, trans fluid and filter, pumped up the tires.....DONE.

sounds exactly like how my 1450 would act before I rebuilt the carb. It would run like a champ one time, then could barely keep it running the next. After the carb rebuild it's been a drastic improvement.

Would that cause the smell of overheating/burning oil, and white smoke?

Bcdsfcret
 

Sounds like the piston rings are shot.:American Flag 1:

if it's running super rich like mine was yes, in fact I recall the engine smelling really hot before where it does not now.

Look at this vid, this is my tractor prior to rebuilding the carb.
http://www.youtube.com/watch?v=lUKYQ4GF6Fw

Right at the 1 minute mark it starts running really bad, misfiring, smoking white etc. This is because the float bowl was so full of fuel it was leaking right into the carb unmetered in any way. The float valve was not working right and just let fuel keep flowing to the point that it was just flowing straight into the carb. The excessive white smoke is unburned fuel, you can smell it. Watch the whole vid and you will see it backfire and shoot some black smoke, that is the old dirty oil burning.

The carb's job is to provide an air and fuel mixture. If you are running rich it will run hot, ping, knock, it can detonate and come apart sending parts of your engine all over and injure you. There is a youtube vid of a guys cub burning to the ground when it caught fire too.

It's a dangerous condition and should not be ignored, a carb rebuild kit is 13 dollars at any cub cadet dealer.

I can make a vid of how it runs now, it's like a totally different tractor. It still smokes here and there but that is due to old age, and the smoke is darker and smells like oil.

Hi CC,

Thanks for the vid! I had to laugh as thats about how mine sounded.:D I'll get the carb rebuild ASAP. Thanks for being very helpful.

Cheers,
nate

Nate just incase you need it.

http://www.onlycubcadets.net/forum/s...ead.php?t=4376

no trouble at all Nate, glad to share my experiences if it saves someone else some trouble. You might find that yours still smokes a little too even after the carb rebuild but that is pretty typical of these old kohlers that have not been gone through. Mine cleared up smoking quite a bit though once it was running right. Seems to toot a little oil smoke during the first minute of running and after that, I just see a little bit here and there, like right when I idle it up high from a slow speed.

Good luck with it, keep us all posted on how it goes.

Thanks Duke, But I already beat you too it, just finish reading the tutorial.:beerchug:

Thanks again.

CC,

I'll keep you informed! :)

DOh! As long as you got to it! That's all that matters!:beer2:

This is what happens. If I start the tractor in full throttle she works fine. But if I lower it she will start to backfire, vibrate, and die. Even if I try to go back to full throttle it will still do it. It only seems to work fine starting up at full throttle. Maybe a slight decrease it will still run. But if I lower it and try to go back to full she will start to have the issues stated above. I am patiently waiting for my carb rebuilt kit to come in the mail.

If this final analysis will help confirm the problem please reply.

Thanks,
Nathan

P.S. I mowed an entire lawn today without a problem for granted in full thottle the entire time. Very little white smoke either!!:bigthink: It cut the grass amazingly and it looks so green and lush now. :beerchug:

from your description is reads like a classic air/fuel mix issue. Carb cleaning and rebuild should do the trick.

Sounds like it is running very rich and will only run OK with as much air coming in as possible (WOT). That will be corrected with a cleaning and rebuild, I can just about guarantee it. Carb rebuild brought my 1450 from all but useless to running excellent.

For the cost, I would do any old cub the favor. Proper fuel mix is one of the keys to a long lasting engine.

Thanks CC1450,

Your one top poster and great help. Its a good feeling when someone can pin point the problem and had similar/same problems!:beer2:

no worries. These engines are simple enough that there is not much else it could be. I work on OBD-II fuel injected BMW engines loaded down with emissions parts for a living. Really makes you appreciate the simpler machines at the end of the day. :)