200 YTH2448 - Several issues

[MichFish86]

Hi everyone,
Last week I picked up a 2006 Husqvarna YTH2448 with 445 hours on it. Test drive on the seller's level lawn seemed to go great, then I got it home to my hilly lawn and found issues. First, when moving, the hydrostatic transmission was quite loud on hills. Then, shortly after I started cutting, I tried to go in reverse with the blades engaged and the engine nearly stalled, then backfired loudly. I continued to cut, but shut off the blades in reverse and it did OK. After a few minutes, occasional white smoke started coming from the engine. The more I cut, the more white smoke I got and the more the mower starting missing.

Recapping the issues:
1) Loud-ish hydrostatic sounds
2) Loss of power in reverse (especially with blades on)
3) Loss of power in reverse resulting in big backfire
4) Increasing amounts of white smoke from engine after the backfire
5) After a bit more time, the mower sounds like it is starting to miss

After the backfire I changed the oil, oil filter, fuel filter, and spark plugs to see if it would improve the lack of power in reverse issue. There was no change.

I appreciate any advice you can offer me.

 

[Fish]

There is usually a safety that will prevent you from cutting in reverse, so maybe someone has cut into the wiring to remedy this
and is not done well. To help more, we need all of the model numbers off of the tag under/behind the seat, and off of the engine.

 

[MichFish86]

To help more, we need all of the model numbers off of the tag under/behind the seat, and off of the engine.

Mower: Product = 279201, Serial = 022306B001337, Model = YTH2448

Engine: Model = 445677, Type = 0413 E1, Code = 050614 YH


Thanks again!!

 

[Fish]

Well the smoke could be a separate issue, like excess gas getting into the crankcase from a flooding carb, or a head gasket starting to blow. Here is a pic of your wiring, just for an initial test, unplug the kill wire going to your coils and mow with it
backwards etc., see if anything changes. The fuel shutoff should still shut your engine off when you turn the key off, if not, you will need to choke it down, or carefully pull the plug wires with insulated pliers.

 

[MichFish86]

Here is a pic of your wiring.

The picture didn't work. Can you try to repost it so I know which wire to pull? Thanks.

 

[Carscw]

After you start the engine are you turning the key back to the first position as that's where it needs to be to mow in reverse ?

When you pulled the plugs was there oil on them.

 

[MichFish86]

After you start the engine are you turning the key back to the first position as that's where it needs to be to mow in reverse ?

When you pulled the plugs was there oil on them.

Good call on the key. This is exactly why the mower wanted to stall in reverse. This is my first riding mower and I should have spent more time learning about such "features". So, after I screwed up and ran it in reverse without turning the key to the correct position, it caused a backfire, and since then it has been discharging white smoke and running roughly. Not super rough, but something is clearly wrong.

I just started it, ran it for a couple of minutes, and checked the plugs. Neither were wet with oil, but one had more black buildup on it than the other, although both were quite dark. Those plugs had about 30 minutes of run time on them.

 

[MichFish86]

Re: 2006 YTH2448 - Several issues

I'll be out of the country for the next 6 days for business and will have limited internet access, but I would really appreciate it if anyone could post any opinions about what could be causing the rough running and white smoke that I'm seeing. Please read through previous posts to get the whole story. I'll reply to anyone that posts a suggestion once I get back. Thanks again for sharing your expertise.

 

[Flyin2low]

Re: 2006 YTH2448 - Several issues

I'll be out of the country for the next 6 days for business and will have limited internet access, but I would really appreciate it if anyone could post any opinions about what could be causing the rough running and white smoke that I'm seeing. Please read through previous posts to get the whole story. I'll reply to anyone that posts a suggestion once I get back. Thanks again for sharing your expertise.

The rough running and smoke are from the valve guides sliding out of place. When running the 24hp Briggs and Stratton in hot temperatures the valve guide/seals slide out of place. Eventually you will lose one cylinder, then you will know for sure.

I rebuilt mine but there's no way to stop it. The only solution is to put on new heads/valves from a newer model year where they fixed the problem.

 

[detel]

Good call on the key. This is exactly why the mower wanted to stall in reverse. This is my first riding mower and I should have spent more time learning about such "features". So, after I screwed up and ran it in reverse without turning the key to the correct position, it caused a backfire, and since then it has been discharging white smoke and running roughly. Not super rough, but something is clearly wrong.

I just started it, ran it for a couple of minutes, and checked the plugs. Neither were wet with oil, but one had more black buildup on it than the other, although both were quite dark. Those plugs had about 30 minutes of run time on them.

Check your air filters and make sure they are clean. New plugs with only 30 minutes on them shouldn't be black.