Kohler K321 on a 1450 backfires and stalls.

[mikeangelini]

Hello all, Thanks for the help so far with my 'new to me' tractor.

Yesterday, after mowing at full throttle for about 35 minutes, the engine will suddenly start to backfire badly, (Fire shooting out of the muffler.) and then stall.

It wouldn't start back up right away. It would turn over, but not start.

About a minute or 2 later, it would run again.

Could it be heat related? This happened last week after around the same amount of run time.

Thanks,

Mike

[Shaner]

it could be your coil is going bad. check to see if its getting hot when the tractor is running. thats usually a sign of the coil going bad. your condenser might also need replacing.

[mikeangelini]

I will check the coil for heat. Should it get hot right away if it is going bad?
Run the engine at idle or fast?

Is there a way to check it with an ohm meter?

Thanks,
Mike

[cmatthew]

wouldnt hurt to just replace it. and if your going to replace the coil you gots to replace the condenser. i think i paid around 40 bucks for a coil and a condenser from our sponsors. the one on there was original.

[ole 147]

Hold up there,

Before changing the coil I would check the carb and make sure it is getting gas.
My 147 use to do that when I would go up my hill and my gas tank was low.
I gave it a rebuild on the carb but haven`t run low on gas since to see if it still back fires when I run out of gas under load. Kholers like to do that.
Next time it does that, check to see if you have gas at the carb. just to make sure.
It could be vapor locking to the 1450`s run a little hotter than the older mods.
Hate to see you buy a coil and not need it.
It`s also a good idea to check and make sure the mice didn`t build a nest between the eng and the tin also check the screen on the back of the engine to be sure it isn`t clogged up. Seems like no one checks there.
I guess thats it. Good Luck.
You should have seen the rats nest in my 1450
Fire shooting out of the muffler I forgot bout that, check the needle n seat. If that isn`t seating could be a problem too.
I hate it when that happens.
Oh yea when it stops check to see if you have spark if it don`t start up. If you are getting spark go for the above.
Don't jump to conclusions check it out before you run out and buy stuff you don`t need, but then it still wont run right.
I`m not saying it`s not the coil but check it out you can fix it faster that way, n get more seat time.

ole 147

[ajgross]

Actually, I bet his exhaust valve is sticking. Try running a little bit of Marvel's Mystery Oil in your gas. Only about a cap full per tank. If it is your valve sticking, that should help.

AJ

[TommyK]

Originally Posted by ajgross

Actually, I bet his exhaust valve is sticking. Try running a little bit of Marvel's Mystery Oil in your gas. Only about a cap full per tank. If it is your valve sticking, that should help.

AJ

+1 to what AJ said. I'd try the Marvel's Mystery Oil. If that doesn't help you may want to pull the head and see how it looks inside, ie carbon buildup and condition of the valves. I think if the coil was getting hot and going bad, you wouldn't be able to start the tractor until the coil cooled back down, about 30 minutes or so.

[ole 147]

Another thing to check, before you run out and buy a bunch of stuff is if you have a compression gage another thing to test is the compression while it won't start. that will give you an idea if any valves are sticking. And above all check the SPARK PLUG......
Buying parts and stuff just cause it might be it, isn't a good way to fix engines. I'm cheap I don't like to buy stuff I don't need, cuts in to my play money.
Download the kholer manual for that eng if you don't have it. you will need it some time thats for sure and its free.
If you don't have a manual for the 321 here is a link to their site for the manual it's free this site also has a very good tech library.
http://www.kohlerengines.com/onlinec...1346_c_all.pdf

[IH Cub Cadet]

Sounds like a stuck exhaust valve to me.

Compression check is a little more complicated with the Kohlers due to the automatic compression release. You might need to use a manometer set-up. The Kohler manual describes how to use one - which you can make.

Good luck,
Bill

[Cub Cadet 123]

Originally Posted by ole 147

Another thing to check, before you run out and buy a bunch of stuff is if you have a compression gage another thing to test is the compression while it won't start. that will give you an idea if any valves are sticking. And above all check the SPARK PLUG......
Buying parts and stuff just cause it might be it, isn't a good way to fix engines. I'm cheap I don't like to buy stuff I don't need, cuts in to my play money.
Download the kholer manual for that eng if you don't have it. you will need it some time thats for sure and its free.
If you don't have a manual for the 321 here is a link to their site for the manual it's free this site also has a very good tech library.
http://www.kohlerengines.com/onlinec...1346_c_all.pdf

If it shot flames out of the exhaust, then it sounds like you backfired hard and have fouled the plug, so it definitely needs replaced. That's the least expensive thing to do to start with at first (buy at least two, just in case one fouls while you are trying to resolve your problem). Check your fuel line to your carb to see if it is getting pinched by the hood or squeezed so that fuel is not making it to your carb. Check your adjustments on your carb next--that doesn't cost anything and bad carb adjustment has been the cause of mine backfiring several times. Then, use the MMO in your fuel and see how that results. These are quick little checks that will help you to keep your costs down.

Cub Cadet 123